[U-Boot] [PATCH v2 0/3] avr32: simple paging support

[U-Boot] [PATCH v2 0/3] avr32: simple paging support

[Haavard Skinnemoen]

This series fixes a longstanding problem with the 'saveenv' command on
ATNGW100.

It also includes a trivial enhancement to the exception reporting which
I found very useful during debugging.

Hopefully this will make mainline u-boot useful again on AVR32. Without
this fix, v2008.10 is the latest usable release.

This is the second version of this series. The following changes have
been made since v1:
  - Rebased onto testing/arm-reloc-and-cache-support
  - Dropped asm/unaligned.h fix because a similar patch has already been
    applied to mainline.
  - Fixed SDRAM initialization issue noticed on certain boards

Haavard Skinnemoen (3):
      avr32: Print unrelocated PC on exception
      avr32: Use uncached() macro to get an address for SDRAM init
      avr32: Add simple paging support

 arch/avr32/cpu/at32ap700x/Makefile                 |    2 +-
 arch/avr32/cpu/at32ap700x/mmu.c                    |   78 ++++++++++++++++++++
 arch/avr32/cpu/exception.c                         |    3 +-
 arch/avr32/cpu/start.S                             |   19 +++--
 arch/avr32/include/asm/arch-at32ap700x/addrspace.h |    5 +-
 arch/avr32/include/asm/arch-at32ap700x/mmu.h       |   66 +++++++++++++++++
 arch/avr32/lib/board.c                             |    4 +
 board/atmel/atngw100/atngw100.c                    |   19 ++++-
 board/atmel/atstk1000/atstk1000.c                  |   19 ++++-
 board/earthlcd/favr-32-ezkit/favr-32-ezkit.c       |   19 ++++-
 board/mimc/mimc200/mimc200.c                       |   24 +++++-
 board/miromico/hammerhead/hammerhead.c             |   19 ++++-
 include/configs/atngw100.h                         |    3 +
 include/configs/atstk1002.h                        |    3 +
 include/configs/atstk1003.h                        |    3 +
 include/configs/atstk1004.h                        |    3 +
 include/configs/atstk1006.h                        |    3 +
 include/configs/favr-32-ezkit.h                    |    3 +
 include/configs/hammerhead.h                       |    3 +
 include/configs/mimc200.h                          |    3 +
 20 files changed, 274 insertions(+), 27 deletions(-)
 create mode 100644 arch/avr32/cpu/at32ap700x/mmu.c
 create mode 100644 arch/avr32/include/asm/arch-at32ap700x/mmu.h

[U-Boot] [PATCH v2 1/3] avr32: Print unrelocated PC on exception

[Haavard Skinnemoen]

In addition to the real PC value, also print the value of PC after
subtracting the relocation offset. This value will match the address in
the ELF file so it's much easier to figure out where things went wrong.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
---
 arch/avr32/cpu/exception.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/avr32/cpu/exception.c b/arch/avr32/cpu/exception.c
index dc9c300..b21ef1f 100644
--- a/arch/avr32/cpu/exception.c
+++ b/arch/avr32/cpu/exception.c
@@ -59,7 +59,8 @@ void do_unknown_exception(unsigned int ecr, struct pt_regs *regs)
 {
 	unsigned int mode;
 
-	printf("\n *** Unhandled exception %u at PC=0x%08lx\n", ecr, regs->pc);
+	printf("\n *** Unhandled exception %u at PC=0x%08lx [%08lx]\n",
+			ecr, regs->pc, regs->pc - gd->reloc_off);
 
 	switch (ecr) {
 	case ECR_BUS_ERROR_WRITE:
-- 
1.7.0.4

[U-Boot] [PATCH v2 1/3] avr32: Print unrelocated PC on exception

[Reinhard Meyer]

Hello Andreas,

did/can you test that one as well?
Then I can take all 3 of the series in.

Thanks,
Reinhard

> In addition to the real PC value, also print the value of PC after
> subtracting the relocation offset. This value will match the address in
> the ELF file so it's much easier to figure out where things went wrong.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
> ---
>  arch/avr32/cpu/exception.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/avr32/cpu/exception.c b/arch/avr32/cpu/exception.c
> index dc9c300..b21ef1f 100644
> --- a/arch/avr32/cpu/exception.c
> +++ b/arch/avr32/cpu/exception.c
> @@ -59,7 +59,8 @@ void do_unknown_exception(unsigned int ecr, struct pt_regs *regs)
>  {
>  	unsigned int mode;
>  
> -	printf("\n *** Unhandled exception %u at PC=0x%08lx\n", ecr, regs->pc);
> +	printf("\n *** Unhandled exception %u at PC=0x%08lx [%08lx]\n",
> +			ecr, regs->pc, regs->pc - gd->reloc_off);
>  
>  	switch (ecr) {
>  	case ECR_BUS_ERROR_WRITE:

[U-Boot] [PATCH v2 1/3] avr32: Print unrelocated PC on exception

[Andreas Bießmann]

Dear Reinhard Meyer,

Am 03.09.2010 13:51, schrieb Reinhard Meyer:
> Hello Andreas,
> 
> did/can you test that one as well?
> Then I can take all 3 of the series in.

Well I have applied this patch but have never tested this till now. Yes
it works and shows correct information.

>> In addition to the real PC value, also print the value of PC after
>> subtracting the relocation offset. This value will match the address in
>> the ELF file so it's much easier to figure out where things went wrong.
>>
>> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Tested-by: Andreas Bie?mann <biessmann@corscience.de>

regards

Andreas Bie?mann

[U-Boot] [PATCH v2 1/3] avr32: Print unrelocated PC on exception

[Reinhard Meyer]

Haavard Skinnemoen schrieb:
> In addition to the real PC value, also print the value of PC after
> subtracting the relocation offset. This value will match the address in
> the ELF file so it's much easier to figure out where things went wrong.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
> ---
>  arch/avr32/cpu/exception.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
Applied to u-boot-atmel/avr32
Thanks,
Reinhard
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[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Haavard Skinnemoen]

The paging system which is required to set up caching properties has not
yet been initialized when the SDRAM is initialized. So when the
map_physmem() function is converted to return the physical address
unchanged, the SDRAM initialization will break on some boards.

The avr32-specific uncached() macro will return an address which will
always cause uncached accessed to be made. Since this happens in the
board code, using avr32-specific features should be ok, and will allow
the SDRAM initialization to keep working.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
---
 board/atmel/atngw100/atngw100.c              |    4 +---
 board/atmel/atstk1000/atstk1000.c            |    4 +---
 board/earthlcd/favr-32-ezkit/favr-32-ezkit.c |    4 +---
 board/mimc/mimc200/mimc200.c                 |    4 +---
 board/miromico/hammerhead/hammerhead.c       |    4 +---
 5 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/board/atmel/atngw100/atngw100.c b/board/atmel/atngw100/atngw100.c
index 004d8da..4580f55 100644
--- a/board/atmel/atngw100/atngw100.c
+++ b/board/atmel/atngw100/atngw100.c
@@ -75,13 +75,11 @@ phys_size_t initdram(int board_type)
 	unsigned long actual_size;
 	void *sdram_base;
 
-	sdram_base = map_physmem(EBI_SDRAM_BASE, EBI_SDRAM_SIZE, MAP_NOCACHE);
+	sdram_base = uncached(EBI_SDRAM_BASE);
 
 	expected_size = sdram_init(sdram_base, &sdram_config);
 	actual_size = get_ram_size(sdram_base, expected_size);
 
-	unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
-
 	if (expected_size != actual_size)
 		printf("Warning: Only %lu of %lu MiB SDRAM is working\n",
 				actual_size >> 20, expected_size >> 20);
diff --git a/board/atmel/atstk1000/atstk1000.c b/board/atmel/atstk1000/atstk1000.c
index c36cb57..d91d594 100644
--- a/board/atmel/atstk1000/atstk1000.c
+++ b/board/atmel/atstk1000/atstk1000.c
@@ -97,13 +97,11 @@ phys_size_t initdram(int board_type)
 	unsigned long actual_size;
 	void *sdram_base;
 
-	sdram_base = map_physmem(EBI_SDRAM_BASE, EBI_SDRAM_SIZE, MAP_NOCACHE);
+	sdram_base = uncached(EBI_SDRAM_BASE);
 
 	expected_size = sdram_init(sdram_base, &sdram_config);
 	actual_size = get_ram_size(sdram_base, expected_size);
 
-	unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
-
 	if (expected_size != actual_size)
 		printf("Warning: Only %lu of %lu MiB SDRAM is working\n",
 				actual_size >> 20, expected_size >> 20);
diff --git a/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c b/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
index 8af680f..d2843c9 100644
--- a/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
+++ b/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
@@ -68,13 +68,11 @@ phys_size_t initdram(int board_type)
 	unsigned long actual_size;
 	void *sdram_base;
 
-	sdram_base = map_physmem(EBI_SDRAM_BASE, EBI_SDRAM_SIZE, MAP_NOCACHE);
+	sdram_base = uncached(EBI_SDRAM_BASE);
 
 	expected_size = sdram_init(sdram_base, &sdram_config);
 	actual_size = get_ram_size(sdram_base, expected_size);
 
-	unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
-
 	if (expected_size != actual_size)
 		printf("Warning: Only %lu of %lu MiB SDRAM is working\n",
 				actual_size >> 20, expected_size >> 20);
diff --git a/board/mimc/mimc200/mimc200.c b/board/mimc/mimc200/mimc200.c
index cc0f137..9940669 100644
--- a/board/mimc/mimc200/mimc200.c
+++ b/board/mimc/mimc200/mimc200.c
@@ -153,13 +153,11 @@ phys_size_t initdram(int board_type)
 	unsigned long actual_size;
 	void *sdram_base;
 
-	sdram_base = map_physmem(EBI_SDRAM_BASE, EBI_SDRAM_SIZE, MAP_NOCACHE);
+	sdram_base = uncached(EBI_SDRAM_BASE);
 
 	expected_size = sdram_init(sdram_base, &sdram_config);
 	actual_size = get_ram_size(sdram_base, expected_size);
 
-	unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
-
 	if (expected_size != actual_size)
 		printf("Warning: Only %lu of %lu MiB SDRAM is working\n",
 				actual_size >> 20, expected_size >> 20);
diff --git a/board/miromico/hammerhead/hammerhead.c b/board/miromico/hammerhead/hammerhead.c
index 8b3e22c..5ab999e 100644
--- a/board/miromico/hammerhead/hammerhead.c
+++ b/board/miromico/hammerhead/hammerhead.c
@@ -80,13 +80,11 @@ phys_size_t initdram(int board_type)
 	unsigned long actual_size;
 	void *sdram_base;
 
-	sdram_base = map_physmem(EBI_SDRAM_BASE, EBI_SDRAM_SIZE, MAP_NOCACHE);
+	sdram_base = uncached(EBI_SDRAM_BASE);
 
 	expected_size = sdram_init(sdram_base, &sdram_config);
 	actual_size = get_ram_size(sdram_base, expected_size);
 
-	unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
-
 	if (expected_size != actual_size)
 		printf("Warning: Only %lu of %lu MiB SDRAM is working\n",
 		       actual_size >> 20, expected_size >> 20);
-- 
1.7.0.4

[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Detlev Zundel]

Hi Haavard,

> The paging system which is required to set up caching properties has not
> yet been initialized when the SDRAM is initialized. So when the
> map_physmem() function is converted to return the physical address
> unchanged, the SDRAM initialization will break on some boards.
>
> The avr32-specific uncached() macro will return an address which will
> always cause uncached accessed to be made. Since this happens in the
> board code, using avr32-specific features should be ok, and will allow
> the SDRAM initialization to keep working.
>
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
> ---
>  board/atmel/atngw100/atngw100.c              |    4 +---
>  board/atmel/atstk1000/atstk1000.c            |    4 +---
>  board/earthlcd/favr-32-ezkit/favr-32-ezkit.c |    4 +---
>  board/mimc/mimc200/mimc200.c                 |    4 +---
>  board/miromico/hammerhead/hammerhead.c       |    4 +---
>  5 files changed, 5 insertions(+), 15 deletions(-)
>
> diff --git a/board/atmel/atngw100/atngw100.c b/board/atmel/atngw100/atngw100.c
> index 004d8da..4580f55 100644
> --- a/board/atmel/atngw100/atngw100.c
> +++ b/board/atmel/atngw100/atngw100.c
> @@ -75,13 +75,11 @@ phys_size_t initdram(int board_type)
>  	unsigned long actual_size;
>  	void *sdram_base;
>  
> -	sdram_base = map_physmem(EBI_SDRAM_BASE, EBI_SDRAM_SIZE, MAP_NOCACHE);
> +	sdram_base = uncached(EBI_SDRAM_BASE);
>  
>  	expected_size = sdram_init(sdram_base, &sdram_config);
>  	actual_size = get_ram_size(sdram_base, expected_size);
>  
> -	unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
> -

So this patch replaces a construct which seems to be valid over all
architectures by a construct which is only used in avr32, right?  It
also deletes the explicit statement that such a mapping is not needed
any further.

Isn't this a step backward?  Can't you put the functionality inside the
map function and leave the unmap a noop?

Cheers
  Detlev

-- 
Man against god... God against Man... Man against nature... Nature against
man...   God against nature...   Nature against god...  a very, very funny
religion.             -- Zen Master D.T. Suzuki commenting on Christianity
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Haavard Skinnemoen]

Detlev Zundel <dzu@denx.de> wrote:
> So this patch replaces a construct which seems to be valid over all
> architectures by a construct which is only used in avr32, right?  It
> also deletes the explicit statement that such a mapping is not needed
> any further.

Problem is that in order to make the CFI driver work on avr32, we need
to change the map_physmem() macro to return the physical address
unchanged.

> Isn't this a step backward?  Can't you put the functionality inside the
> map function and leave the unmap a noop?

I agree it's a step backward, but since the previous flamewar didn't
get us anywhere, I decided to go for a compromise this time. At least
this small architecture-specific kludge is localized to
architecture-specific code.

The map_physmem() macro currently does exactly the same thing as the
uncached() macro, and the unmap is a noop, but the next patch changes
it in order to fix the CFI driver. If the next patch is applied without
this patch being applied first, the SDRAM driver will do cached
accesses during initialization, and that may cause the initialization
to fail.

Haavard

[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Detlev Zundel]

Hi Haavard,

> Detlev Zundel <dzu@denx.de> wrote:
>> So this patch replaces a construct which seems to be valid over all
>> architectures by a construct which is only used in avr32, right?  It
>> also deletes the explicit statement that such a mapping is not needed
>> any further.
>
> Problem is that in order to make the CFI driver work on avr32, we need
> to change the map_physmem() macro to return the physical address
> unchanged.

I see.  And I presume you cannot tell the situation apart inside
map_physmem?

>> Isn't this a step backward?  Can't you put the functionality inside the
>> map function and leave the unmap a noop?
>
> I agree it's a step backward, but since the previous flamewar didn't
> get us anywhere, I decided to go for a compromise this time. At least
> this small architecture-specific kludge is localized to
> architecture-specific code.
>
> The map_physmem() macro currently does exactly the same thing as the
> uncached() macro, and the unmap is a noop, but the next patch changes
> it in order to fix the CFI driver. If the next patch is applied without
> this patch being applied first, the SDRAM driver will do cached
> accesses during initialization, and that may cause the initialization
> to fail.

Why not include a note to this extent into the git commit message?  This
would be a great help for other people to later understand why this
change has been done the "backward way" that it was.

Cheers
  Detlev

-- 
vi vi vi - the roman numeral of the beast.
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Haavard Skinnemoen]

Detlev Zundel <dzu@denx.de> wrote:
> > Problem is that in order to make the CFI driver work on avr32, we need
> > to change the map_physmem() macro to return the physical address
> > unchanged.
> 
> I see.  And I presume you cannot tell the situation apart inside
> map_physmem?

I don't think so. How do you propose we do that?

> > The map_physmem() macro currently does exactly the same thing as the
> > uncached() macro, and the unmap is a noop, but the next patch changes
> > it in order to fix the CFI driver. If the next patch is applied without
> > this patch being applied first, the SDRAM driver will do cached
> > accesses during initialization, and that may cause the initialization
> > to fail.
> 
> Why not include a note to this extent into the git commit message?  This
> would be a great help for other people to later understand why this
> change has been done the "backward way" that it was.

The commit message already contains this:

The paging system which is required to set up caching properties has not
yet been initialized when the SDRAM is initialized. So when the
map_physmem() function is converted to return the physical address
unchanged, the SDRAM initialization will break on some boards.

which is essentially the same thing, isn't it?

Haavard

[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Detlev Zundel]

Hi Haavard,

> Detlev Zundel <dzu@denx.de> wrote:
>> > Problem is that in order to make the CFI driver work on avr32, we need
>> > to change the map_physmem() macro to return the physical address
>> > unchanged.
>> 
>> I see.  And I presume you cannot tell the situation apart inside
>> map_physmem?
>
> I don't think so. How do you propose we do that?

I don't know, that's why I'm asking.  

Let's take a step back and please excuse my ignorant question - why
exactly does the CFI driver need the physical address unchanged?  Isn't
the real constraint that the address requested by CFI is uncached?  Why
can't this be done by map_physmem()?

>> > The map_physmem() macro currently does exactly the same thing as the
>> > uncached() macro, and the unmap is a noop, but the next patch changes
>> > it in order to fix the CFI driver. If the next patch is applied without
>> > this patch being applied first, the SDRAM driver will do cached
>> > accesses during initialization, and that may cause the initialization
>> > to fail.
>> 
>> Why not include a note to this extent into the git commit message?  This
>> would be a great help for other people to later understand why this
>> change has been done the "backward way" that it was.
>
> The commit message already contains this:
>
> The paging system which is required to set up caching properties has not
> yet been initialized when the SDRAM is initialized. So when the
> map_physmem() function is converted to return the physical address
> unchanged, the SDRAM initialization will break on some boards.
>
> which is essentially the same thing, isn't it?

For me this is not the same - it does not include a word why the change
which you agree "looks backward" is something that we want to do.  For
me something like this would give me more information:

  Unfortunately we cannot make "map_physmem()/unmap_physmem()" on the
  AVR32 platform work with the CFI driver as it works on other
  platforms. [I don't understand why this is the case, so your
  explanation would go here ;) ] To still fix the issue we deliberately
  replace these generic routines by AVR32 specific routines.  If someone
  can fix this using the generic patterns, patches are welcome.

I believe that good docmumentation should include such pro- and con
reasoning so that code changes can be comprehended even after the fact.

Cheers
  Detlev

-- 
Emacs seems a more likely candidate  to contain a mail system than the
mail system to contain an Emacs, so this is the way it was done.
                                            -- Bernard S. Greenberg
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Andreas Bießmann]

Dear Haavard Skinnemoen,

Am 12.08.2010 08:52, schrieb Haavard Skinnemoen:
> The paging system which is required to set up caching properties has not
> yet been initialized when the SDRAM is initialized. So when the
> map_physmem() function is converted to return the physical address
> unchanged, the SDRAM initialization will break on some boards.
> 
> The avr32-specific uncached() macro will return an address which will
> always cause uncached accessed to be made. Since this happens in the
> board code, using avr32-specific features should be ok, and will allow
> the SDRAM initialization to keep working.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Tested-by: Andreas Bie?mann <biessmann@corscience.de>

one colleague reported similar problems initialising SDRAM on our own
board. I could not reproduce this issue here, however this patch fixed
the problem. Thanks for that, it came the right time.

This patch should be applied too.

regards

Andreas Bie?mann

[U-Boot] [PATCH v2 2/3] avr32: Use uncached() macro to get an address for SDRAM init

[Reinhard Meyer]

Haavard Skinnemoen schrieb:
> The paging system which is required to set up caching properties has not
> yet been initialized when the SDRAM is initialized. So when the
> map_physmem() function is converted to return the physical address
> unchanged, the SDRAM initialization will break on some boards.
> 
> The avr32-specific uncached() macro will return an address which will
> always cause uncached accessed to be made. Since this happens in the
> board code, using avr32-specific features should be ok, and will allow
> the SDRAM initialization to keep working.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
> ---
>  board/atmel/atngw100/atngw100.c              |    4 +---
>  board/atmel/atstk1000/atstk1000.c            |    4 +---
>  board/earthlcd/favr-32-ezkit/favr-32-ezkit.c |    4 +---
>  board/mimc/mimc200/mimc200.c                 |    4 +---
>  board/miromico/hammerhead/hammerhead.c       |    4 +---
>  5 files changed, 5 insertions(+), 15 deletions(-)
Applied to u-boot-atmel/avr32
Thanks,
Reinhard

[U-Boot] [PATCH v2 3/3] avr32: Add simple paging support

[Haavard Skinnemoen]

Use the MMU hardware to set up 1:1 mappings between physical and virtual
addresses. This allows us to bypass the cache when accessing the flash
without having to do any physical-to-virtual address mapping in the CFI
driver.

The virtual memory mappings are defined at compile time through a sorted
array of virtual memory range objects. When a TLB miss exception
happens, the exception handler does a binary search through the array
until it finds a matching entry and loads it into the TLB. The u-boot
image itself is covered by a fixed TLB entry which is never replaced.

This makes the 'saveenv' command work again on ATNGW100 and other boards
using the CFI driver, hopefully without breaking any rules.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
---
 arch/avr32/cpu/at32ap700x/Makefile                 |    2 +-
 arch/avr32/cpu/at32ap700x/mmu.c                    |   78 ++++++++++++++++++++
 arch/avr32/cpu/start.S                             |   19 +++--
 arch/avr32/include/asm/arch-at32ap700x/addrspace.h |    5 +-
 arch/avr32/include/asm/arch-at32ap700x/mmu.h       |   66 +++++++++++++++++
 arch/avr32/lib/board.c                             |    4 +
 board/atmel/atngw100/atngw100.c                    |   15 ++++
 board/atmel/atstk1000/atstk1000.c                  |   15 ++++
 board/earthlcd/favr-32-ezkit/favr-32-ezkit.c       |   15 ++++
 board/mimc/mimc200/mimc200.c                       |   20 +++++
 board/miromico/hammerhead/hammerhead.c             |   15 ++++
 include/configs/atngw100.h                         |    3 +
 include/configs/atstk1002.h                        |    3 +
 include/configs/atstk1003.h                        |    3 +
 include/configs/atstk1004.h                        |    3 +
 include/configs/atstk1006.h                        |    3 +
 include/configs/favr-32-ezkit.h                    |    3 +
 include/configs/hammerhead.h                       |    3 +
 include/configs/mimc200.h                          |    3 +
 19 files changed, 267 insertions(+), 11 deletions(-)
 create mode 100644 arch/avr32/cpu/at32ap700x/mmu.c
 create mode 100644 arch/avr32/include/asm/arch-at32ap700x/mmu.h

diff --git a/arch/avr32/cpu/at32ap700x/Makefile b/arch/avr32/cpu/at32ap700x/Makefile
index 46e6ef6..30ea925 100644
--- a/arch/avr32/cpu/at32ap700x/Makefile
+++ b/arch/avr32/cpu/at32ap700x/Makefile
@@ -24,7 +24,7 @@ include $(TOPDIR)/config.mk
 
 LIB	:= $(obj)lib$(SOC).a
 
-COBJS	:= portmux.o clk.o
+COBJS	:= portmux.o clk.o mmu.o
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
 
diff --git a/arch/avr32/cpu/at32ap700x/mmu.c b/arch/avr32/cpu/at32ap700x/mmu.c
new file mode 100644
index 0000000..c3a1b93
--- /dev/null
+++ b/arch/avr32/cpu/at32ap700x/mmu.c
@@ -0,0 +1,78 @@
+#include <common.h>
+#include <asm/arch/mmu.h>
+#include <asm/sysreg.h>
+
+void mmu_init_r(unsigned long dest_addr)
+{
+	uintptr_t	vmr_table_addr;
+
+	/* Round monitor address down to the nearest page boundary */
+	dest_addr &= PAGE_ADDR_MASK;
+
+	/* Initialize TLB entry 0 to cover the monitor, and lock it */
+	sysreg_write(TLBEHI, dest_addr | SYSREG_BIT(TLBEHI_V));
+	sysreg_write(TLBELO, dest_addr | MMU_VMR_CACHE_WRBACK);
+	sysreg_write(MMUCR, SYSREG_BF(DRP, 0) | SYSREG_BF(DLA, 1)
+			| SYSREG_BIT(MMUCR_S) | SYSREG_BIT(M));
+	__builtin_tlbw();
+
+	/*
+	 * Calculate the address of the VM range table in a PC-relative
+	 * manner to make sure we hit the SDRAM and not the flash.
+	 */
+	vmr_table_addr = (uintptr_t)&mmu_vmr_table;
+	sysreg_write(PTBR, vmr_table_addr);
+	printf("VMR table @ 0x%08x\n", vmr_table_addr);
+
+	/* Enable paging */
+	sysreg_write(MMUCR, SYSREG_BF(DRP, 1) | SYSREG_BF(DLA, 1)
+			| SYSREG_BIT(MMUCR_S) | SYSREG_BIT(M) | SYSREG_BIT(E));
+}
+
+int mmu_handle_tlb_miss(void)
+{
+	const struct mmu_vm_range *vmr_table;
+	const struct mmu_vm_range *vmr;
+	unsigned int fault_pgno;
+	int first, last;
+
+	fault_pgno = sysreg_read(TLBEAR) >> PAGE_SHIFT;
+	vmr_table = (const struct mmu_vm_range *)sysreg_read(PTBR);
+
+	/* Do a binary search through the VM ranges */
+	first = 0;
+	last = CONFIG_SYS_NR_VM_REGIONS;
+	while (first < last) {
+		unsigned int start;
+		int middle;
+
+		/* Pick the entry in the middle of the remaining range */
+		middle = (first + last) >> 1;
+		vmr = &vmr_table[middle];
+		start = vmr->virt_pgno;
+
+		/* Do the bisection thing */
+		if (fault_pgno < start) {
+			last = middle;
+		} else if (fault_pgno >= (start + vmr->nr_pages)) {
+			first = middle + 1;
+		} else {
+			/* Got it; let's slam it into the TLB */
+			uint32_t tlbelo;
+
+			tlbelo = vmr->phys & ~PAGE_ADDR_MASK;
+			tlbelo |= fault_pgno << PAGE_SHIFT;
+			sysreg_write(TLBELO, tlbelo);
+			__builtin_tlbw();
+
+			/* Zero means success */
+			return 0;
+		}
+	}
+
+	/*
+	 * Didn't find any matching entries. Return a nonzero value to
+	 * indicate that this should be treated as a fatal exception.
+	 */
+	return -1;
+}
diff --git a/arch/avr32/cpu/start.S b/arch/avr32/cpu/start.S
index 99c9e06..06bf4c6 100644
--- a/arch/avr32/cpu/start.S
+++ b/arch/avr32/cpu/start.S
@@ -82,12 +82,19 @@ _evba:
 	.org	0x44
 	rjmp	unknown_exception	/* DTLB Modified */
 
-	.org	0x50
-	rjmp	unknown_exception	/* ITLB Miss */
-	.org	0x60
-	rjmp	unknown_exception	/* DTLB Miss (read) */
-	.org	0x70
-	rjmp	unknown_exception	/* DTLB Miss (write) */
+	.org	0x50			/* ITLB Miss */
+	pushm   r8-r12,lr
+	rjmp	1f
+	.org	0x60			/* DTLB Miss (read) */
+	pushm   r8-r12,lr
+	rjmp	1f
+	.org	0x70			/* DTLB Miss (write) */
+	pushm   r8-r12,lr
+1:	mov	r12, sp
+	rcall	mmu_handle_tlb_miss
+	popm	r8-r12,lr
+	brne	unknown_exception
+	rete
 
 	.size	_evba, . - _evba
 
diff --git a/arch/avr32/include/asm/arch-at32ap700x/addrspace.h b/arch/avr32/include/asm/arch-at32ap700x/addrspace.h
index 409eee3..4edc1bd 100644
--- a/arch/avr32/include/asm/arch-at32ap700x/addrspace.h
+++ b/arch/avr32/include/asm/arch-at32ap700x/addrspace.h
@@ -75,10 +75,7 @@ static inline void * phys_to_virt(unsigned long address)
 static inline void *
 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
 {
-	if (flags == MAP_WRBACK)
-		return (void *)P1SEGADDR(paddr);
-	else
-		return (void *)P2SEGADDR(paddr);
+	return (void *)paddr;
 }
 
 #endif /* __ASM_AVR32_ADDRSPACE_H */
diff --git a/arch/avr32/include/asm/arch-at32ap700x/mmu.h b/arch/avr32/include/asm/arch-at32ap700x/mmu.h
new file mode 100644
index 0000000..fcd9a05
--- /dev/null
+++ b/arch/avr32/include/asm/arch-at32ap700x/mmu.h
@@ -0,0 +1,66 @@
+/*
+ * In order to deal with the hardcoded u-boot requirement that virtual
+ * addresses are always mapped 1:1 with physical addresses, we implement
+ * a small virtual memory manager so that we can use the MMU hardware in
+ * order to get the caching properties right.
+ *
+ * A few pages (or possibly just one) are locked in the TLB permanently
+ * in order to avoid recursive TLB misses, but most pages are faulted in
+ * on demand.
+ */
+#ifndef __ASM_ARCH_MMU_H
+#define __ASM_ARCH_MMU_H
+
+#include <asm/sysreg.h>
+
+#define PAGE_SHIFT	20
+#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#define PAGE_ADDR_MASK	(~(PAGE_SIZE - 1))
+
+#define MMU_VMR_CACHE_NONE						\
+	(SYSREG_BF(AP, 3) | SYSREG_BF(SZ, 3) | SYSREG_BIT(TLBELO_D))
+#define MMU_VMR_CACHE_WBUF						\
+	(MMU_VMR_CACHE_NONE | SYSREG_BIT(B))
+#define MMU_VMR_CACHE_WRTHRU						\
+	(MMU_VMR_CACHE_NONE | SYSREG_BIT(TLBELO_C) | SYSREG_BIT(W))
+#define MMU_VMR_CACHE_WRBACK						\
+	(MMU_VMR_CACHE_WBUF | SYSREG_BIT(TLBELO_C))
+
+/*
+ * This structure is used in our "page table". Instead of the usual
+ * x86-inspired radix tree, we let each entry cover an arbitrary-sized
+ * virtual address range and store them in a binary search tree. This is
+ * somewhat slower, but should use significantly less RAM, and we
+ * shouldn't get many TLB misses when using 1 MB pages anyway.
+ *
+ * With 1 MB pages, we need 12 bits to store the page number. In
+ * addition, we stick an Invalid bit in the high bit of virt_pgno (if
+ * set, it cannot possibly match any faulting page), and all the bits
+ * that need to be written to TLBELO in phys_pgno.
+ */
+struct mmu_vm_range {
+	uint16_t	virt_pgno;
+	uint16_t	nr_pages;
+	uint32_t	phys;
+};
+
+/*
+ * An array of mmu_vm_range objects describing all pageable addresses.
+ * The array is sorted by virt_pgno so that the TLB miss exception
+ * handler can do a binary search to find the correct entry.
+ */
+extern struct mmu_vm_range mmu_vmr_table[];
+
+/*
+ * Initialize the MMU. This will set up a fixed TLB entry for the static
+ * u-boot image@dest_addr and enable paging.
+ */
+void mmu_init_r(unsigned long dest_addr);
+
+/*
+ * Handle a TLB miss exception. This function is called directly from
+ * the exception vector table written in assembly.
+ */
+int mmu_handle_tlb_miss(void);
+
+#endif /* __ASM_ARCH_MMU_H */
diff --git a/arch/avr32/lib/board.c b/arch/avr32/lib/board.c
index b2def97..e6b81cc 100644
--- a/arch/avr32/lib/board.c
+++ b/arch/avr32/lib/board.c
@@ -33,6 +33,7 @@
 
 #include <asm/initcalls.h>
 #include <asm/sections.h>
+#include <asm/arch/mmu.h>
 
 #ifndef CONFIG_IDENT_STRING
 #define CONFIG_IDENT_STRING ""
@@ -265,6 +266,9 @@ void board_init_r(gd_t *new_gd, ulong dest_addr)
 	gd->flags |= GD_FLG_RELOC;
 	gd->reloc_off = dest_addr - CONFIG_SYS_MONITOR_BASE;
 
+	/* Enable the MMU so that we can keep u-boot simple */
+	mmu_init_r(dest_addr);
+
 	board_early_init_r();
 
 	monitor_flash_len = _edata - _text;
diff --git a/board/atmel/atngw100/atngw100.c b/board/atmel/atngw100/atngw100.c
index 4580f55..49bc03e 100644
--- a/board/atmel/atngw100/atngw100.c
+++ b/board/atmel/atngw100/atngw100.c
@@ -26,11 +26,26 @@
 #include <asm/arch/clk.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/hmatrix.h>
+#include <asm/arch/mmu.h>
 #include <asm/arch/portmux.h>
 #include <netdev.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+struct mmu_vm_range mmu_vmr_table[CONFIG_SYS_NR_VM_REGIONS] = {
+	{
+		.virt_pgno	= CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT,
+		.nr_pages	= CONFIG_SYS_FLASH_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_NONE,
+	}, {
+		.virt_pgno	= CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT,
+		.nr_pages	= EBI_SDRAM_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_WRBACK,
+	},
+};
+
 static const struct sdram_config sdram_config = {
 	.data_bits	= SDRAM_DATA_16BIT,
 	.row_bits	= 13,
diff --git a/board/atmel/atstk1000/atstk1000.c b/board/atmel/atstk1000/atstk1000.c
index d91d594..8b1e1b5 100644
--- a/board/atmel/atstk1000/atstk1000.c
+++ b/board/atmel/atstk1000/atstk1000.c
@@ -25,11 +25,26 @@
 #include <asm/sdram.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/hmatrix.h>
+#include <asm/arch/mmu.h>
 #include <asm/arch/portmux.h>
 #include <netdev.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+struct mmu_vm_range mmu_vmr_table[CONFIG_SYS_NR_VM_REGIONS] = {
+	{
+		.virt_pgno	= CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT,
+		.nr_pages	= CONFIG_SYS_FLASH_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_NONE,
+	}, {
+		.virt_pgno	= CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT,
+		.nr_pages	= EBI_SDRAM_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_WRBACK,
+	},
+};
+
 static const struct sdram_config sdram_config = {
 #if defined(CONFIG_ATSTK1006)
 	/* Dual MT48LC16M16A2-7E (64 MB) on daughterboard */
diff --git a/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c b/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
index d2843c9..b0eca93 100644
--- a/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
+++ b/board/earthlcd/favr-32-ezkit/favr-32-ezkit.c
@@ -24,10 +24,25 @@
 #include <asm/sdram.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/hmatrix.h>
+#include <asm/arch/mmu.h>
 #include <asm/arch/portmux.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+struct mmu_vm_range mmu_vmr_table[CONFIG_SYS_NR_VM_REGIONS] = {
+	{
+		.virt_pgno	= CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT,
+		.nr_pages	= CONFIG_SYS_FLASH_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_NONE,
+	}, {
+		.virt_pgno	= CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT,
+		.nr_pages	= EBI_SDRAM_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_WRBACK,
+	},
+};
+
 static const struct sdram_config sdram_config = {
 	/* MT48LC4M32B2P-6 (16 MB) */
 	.data_bits	= SDRAM_DATA_32BIT,
diff --git a/board/mimc/mimc200/mimc200.c b/board/mimc/mimc200/mimc200.c
index 9940669..470adba 100644
--- a/board/mimc/mimc200/mimc200.c
+++ b/board/mimc/mimc200/mimc200.c
@@ -27,12 +27,32 @@
 #include <asm/arch/clk.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/hmatrix.h>
+#include <asm/arch/mmu.h>
 #include <asm/arch/portmux.h>
 #include <atmel_lcdc.h>
 #include <lcd.h>
 
 #include "../../../arch/avr32/cpu/hsmc3.h"
 
+struct mmu_vm_range mmu_vmr_table[CONFIG_SYS_NR_VM_REGIONS] = {
+	{
+		.virt_pgno	= CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT,
+		.nr_pages	= CONFIG_SYS_FLASH_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_NONE,
+	}, {
+		.virt_pgno	= EBI_SRAM_CS2_BASE >> PAGE_SHIFT,
+		.nr_pages	= EBI_SRAM_CS2_SIZE >> PAGE_SHIFT,
+		.phys		= (EBI_SRAM_CS2_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_NONE,
+	}, {
+		.virt_pgno	= CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT,
+		.nr_pages	= EBI_SDRAM_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_WRBACK,
+	},
+};
+
 #if defined(CONFIG_LCD)
 /* 480x272x16 @ 72 Hz */
 vidinfo_t panel_info = {
diff --git a/board/miromico/hammerhead/hammerhead.c b/board/miromico/hammerhead/hammerhead.c
index 5ab999e..78f4fd4 100644
--- a/board/miromico/hammerhead/hammerhead.c
+++ b/board/miromico/hammerhead/hammerhead.c
@@ -30,10 +30,25 @@
 #include <asm/arch/clk.h>
 #include <asm/arch/hmatrix.h>
 #include <asm/arch/memory-map.h>
+#include <asm/arch/mmu.h>
 #include <asm/arch/portmux.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+struct mmu_vm_range mmu_vmr_table[CONFIG_SYS_NR_VM_REGIONS] = {
+	{
+		.virt_pgno	= CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT,
+		.nr_pages	= CONFIG_SYS_FLASH_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_FLASH_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_NONE,
+	}, {
+		.virt_pgno	= CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT,
+		.nr_pages	= EBI_SDRAM_SIZE >> PAGE_SHIFT,
+		.phys		= (CONFIG_SYS_SDRAM_BASE >> PAGE_SHIFT)
+					| MMU_VMR_CACHE_WRBACK,
+	},
+};
+
 static const struct sdram_config sdram_config = {
 	.data_bits	= SDRAM_DATA_32BIT,
 	.row_bits	= 13,
diff --git a/include/configs/atngw100.h b/include/configs/atngw100.h
index 4ed5514..83056b6 100644
--- a/include/configs/atngw100.h
+++ b/include/configs/atngw100.h
@@ -49,6 +49,9 @@
 #define CONFIG_SYS_CLKDIV_PBA			2
 #define CONFIG_SYS_CLKDIV_PBB			1
 
+/* Reserve VM regions for SDRAM and NOR flash */
+#define CONFIG_SYS_NR_VM_REGIONS		2
+
 /*
  * The PLLOPT register controls the PLL like this:
  *   icp = PLLOPT<2>
diff --git a/include/configs/atstk1002.h b/include/configs/atstk1002.h
index b258f2d..6416d17 100644
--- a/include/configs/atstk1002.h
+++ b/include/configs/atstk1002.h
@@ -73,6 +73,9 @@
  */
 #define CONFIG_SYS_CLKDIV_PBB			1
 
+/* Reserve VM regions for SDRAM and NOR flash */
+#define CONFIG_SYS_NR_VM_REGIONS		2
+
 /*
  * The PLLOPT register controls the PLL like this:
  *   icp = PLLOPT<2>
diff --git a/include/configs/atstk1003.h b/include/configs/atstk1003.h
index 2ef2552..a4d9b0b 100644
--- a/include/configs/atstk1003.h
+++ b/include/configs/atstk1003.h
@@ -73,6 +73,9 @@
  */
 #define CONFIG_SYS_CLKDIV_PBB			1
 
+/* Reserve VM regions for SDRAM and NOR flash */
+#define CONFIG_SYS_NR_VM_REGIONS		2
+
 /*
  * The PLLOPT register controls the PLL like this:
  *   icp = PLLOPT<2>
diff --git a/include/configs/atstk1004.h b/include/configs/atstk1004.h
index 195be82..06bb5da 100644
--- a/include/configs/atstk1004.h
+++ b/include/configs/atstk1004.h
@@ -73,6 +73,9 @@
  */
 #define CONFIG_SYS_CLKDIV_PBB			1
 
+/* Reserve VM regions for SDRAM and NOR flash */
+#define CONFIG_SYS_NR_VM_REGIONS		2
+
 /*
  * The PLLOPT register controls the PLL like this:
  *   icp = PLLOPT<2>
diff --git a/include/configs/atstk1006.h b/include/configs/atstk1006.h
index f93118e..d3cbee6 100644
--- a/include/configs/atstk1006.h
+++ b/include/configs/atstk1006.h
@@ -73,6 +73,9 @@
  */
 #define CONFIG_SYS_CLKDIV_PBB			1
 
+/* Reserve VM regions for SDRAM and NOR flash */
+#define CONFIG_SYS_NR_VM_REGIONS		2
+
 /*
  * The PLLOPT register controls the PLL like this:
  *   icp = PLLOPT<2>
diff --git a/include/configs/favr-32-ezkit.h b/include/configs/favr-32-ezkit.h
index 739ff0d..1c381c7 100644
--- a/include/configs/favr-32-ezkit.h
+++ b/include/configs/favr-32-ezkit.h
@@ -70,6 +70,9 @@
  */
 #define CONFIG_SYS_CLKDIV_PBB			1
 
+/* Reserve VM regions for SDRAM and NOR flash */
+#define CONFIG_SYS_NR_VM_REGIONS		2
+
 /*
  * The PLLOPT register controls the PLL like this:
  *   icp = PLLOPT<2>
diff --git a/include/configs/hammerhead.h b/include/configs/hammerhead.h
index 0c70af5..8ca04ea 100644
--- a/include/configs/hammerhead.h
+++ b/include/configs/hammerhead.h
@@ -47,6 +47,9 @@
 #define CONFIG_SYS_CLKDIV_PBA			2
 #define CONFIG_SYS_CLKDIV_PBB			1
 
+/* Reserve VM regions for SDRAM and NOR flash */
+#define CONFIG_SYS_NR_VM_REGIONS		2
+
 /*
  * The PLLOPT register controls the PLL like this:
  *   icp = PLLOPT<2>
diff --git a/include/configs/mimc200.h b/include/configs/mimc200.h
index 36488b3..6ed9e75 100644
--- a/include/configs/mimc200.h
+++ b/include/configs/mimc200.h
@@ -51,6 +51,9 @@
 #define CONFIG_SYS_CLKDIV_PBA			2
 #define CONFIG_SYS_CLKDIV_PBB			1
 
+/* Reserve VM regions for SDRAM, NOR flash and FRAM */
+#define CONFIG_SYS_NR_VM_REGIONS		3
+
 /*
  * The PLLOPT register controls the PLL like this:
  *   icp = PLLOPT<2>
-- 
1.7.0.4

[U-Boot] [PATCH v2 3/3] avr32: Add simple paging support

[Andreas Bießmann]

Dear Haavard Skinnemnoen,

Am 12.08.2010 08:52, schrieb Haavard Skinnemoen:
> Use the MMU hardware to set up 1:1 mappings between physical and virtual
> addresses. This allows us to bypass the cache when accessing the flash
> without having to do any physical-to-virtual address mapping in the CFI
> driver.
> 
> The virtual memory mappings are defined at compile time through a sorted
> array of virtual memory range objects. When a TLB miss exception
> happens, the exception handler does a binary search through the array
> until it finds a matching entry and loads it into the TLB. The u-boot
> image itself is covered by a fixed TLB entry which is never replaced.
> 
> This makes the 'saveenv' command work again on ATNGW100 and other boards
> using the CFI driver, hopefully without breaking any rules.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

Tested-by: Andreas Bie?mann <biessmann@corscience.de>

there were no changes to this patch since last submission. Applying this
should be done soon.

regards

Andreas Bie?mann

[U-Boot] [PATCH v2 3/3] avr32: Add simple paging support

[Reinhard Meyer]

Haavard Skinnemoen schrieb:
> Use the MMU hardware to set up 1:1 mappings between physical and virtual
> addresses. This allows us to bypass the cache when accessing the flash
> without having to do any physical-to-virtual address mapping in the CFI
> driver.
> 
> The virtual memory mappings are defined at compile time through a sorted
> array of virtual memory range objects. When a TLB miss exception
> happens, the exception handler does a binary search through the array
> until it finds a matching entry and loads it into the TLB. The u-boot
> image itself is covered by a fixed TLB entry which is never replaced.
> 
> This makes the 'saveenv' command work again on ATNGW100 and other boards
> using the CFI driver, hopefully without breaking any rules.
> 
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
> ---
>  arch/avr32/cpu/at32ap700x/Makefile                 |    2 +-
>  arch/avr32/cpu/at32ap700x/mmu.c                    |   78 ++++++++++++++++++++
>  arch/avr32/cpu/start.S                             |   19 +++--
>  arch/avr32/include/asm/arch-at32ap700x/addrspace.h |    5 +-
>  arch/avr32/include/asm/arch-at32ap700x/mmu.h       |   66 +++++++++++++++++
>  arch/avr32/lib/board.c                             |    4 +
>  board/atmel/atngw100/atngw100.c                    |   15 ++++
>  board/atmel/atstk1000/atstk1000.c                  |   15 ++++
>  board/earthlcd/favr-32-ezkit/favr-32-ezkit.c       |   15 ++++
>  board/mimc/mimc200/mimc200.c                       |   20 +++++
>  board/miromico/hammerhead/hammerhead.c             |   15 ++++
>  include/configs/atngw100.h                         |    3 +
>  include/configs/atstk1002.h                        |    3 +
>  include/configs/atstk1003.h                        |    3 +
>  include/configs/atstk1004.h                        |    3 +
>  include/configs/atstk1006.h                        |    3 +
>  include/configs/favr-32-ezkit.h                    |    3 +
>  include/configs/hammerhead.h                       |    3 +
>  include/configs/mimc200.h                          |    3 +
>  19 files changed, 267 insertions(+), 11 deletions(-)
>  create mode 100644 arch/avr32/cpu/at32ap700x/mmu.c
>  create mode 100644 arch/avr32/include/asm/arch-at32ap700x/mmu.h
Applied to u-boot-atmel/avr32
Thanks,
Reinhard