[Qemu-devel] [PATCH 1/2] PPC: e500: increase DTC_LOAD_PAD

[Qemu-devel] [PATCH 1/2] PPC: e500: increase DTC_LOAD_PAD

[Scott Wood]

An allowance of 5 MiB for BSS is not enough for Linux kernels with certain
debug options enabled (not sure exactly which one caused it, but I'd guess
lockdep).  The kernel I ran into this with had a BSS of around 6.4 MB.

Unfortunately, uImage does not give us enough information to determine the
actual BSS size.  Increase the allowance to 18 MiB to give us plenty of
room.  Eventually this should be more intelligent, possibly packing
initrd+dtb at the end of guest RAM.

Signed-off-by: Scott Wood <scottwood@freescale.com>
---
 hw/ppc/e500.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
index 6f0de6d..1ccfd7c 100644
--- a/hw/ppc/e500.c
+++ b/hw/ppc/e500.c
@@ -36,7 +36,7 @@
 
 #define BINARY_DEVICE_TREE_FILE    "mpc8544ds.dtb"
 #define UIMAGE_LOAD_BASE           0
-#define DTC_LOAD_PAD               0x500000
+#define DTC_LOAD_PAD               0x1800000
 #define DTC_PAD_MASK               0xFFFFF
 #define INITRD_LOAD_PAD            0x2000000
 #define INITRD_PAD_MASK            0xFFFFFF
-- 
1.7.9.5

[Qemu-devel] [PATCH 2/2] PPC: e500: calculate initrd_base like dt_base

[Scott Wood]

While investigating dtb pad issues, I noticed that initrd_base wasn't taking
loadaddr into account the way dt_base was.  This seems wrong.

Signed-off-by: Scott Wood <scottwood@freescale.com>
---
 hw/ppc/e500.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
index 1ccfd7c..60ddd85 100644
--- a/hw/ppc/e500.c
+++ b/hw/ppc/e500.c
@@ -553,7 +553,8 @@ void ppce500_init(PPCE500Params *params)
 
     /* Load initrd. */
     if (params->initrd_filename) {
-        initrd_base = (kernel_size + INITRD_LOAD_PAD) & ~INITRD_PAD_MASK;
+        initrd_base = (loadaddr + kernel_size + INITRD_LOAD_PAD) &
+            ~INITRD_PAD_MASK;
         initrd_size = load_image_targphys(params->initrd_filename, initrd_base,
                                           ram_size - initrd_base);
 
-- 
1.7.9.5

Re: [Qemu-devel] [PATCH 1/2] PPC: e500: increase DTC_LOAD_PAD

[Alexander Graf]

On 23.08.2012, at 02:55, Scott Wood wrote:

> An allowance of 5 MiB for BSS is not enough for Linux kernels with certain
> debug options enabled (not sure exactly which one caused it, but I'd guess
> lockdep).  The kernel I ran into this with had a BSS of around 6.4 MB.
> 
> Unfortunately, uImage does not give us enough information to determine the
> actual BSS size.  Increase the allowance to 18 MiB to give us plenty of
> room.  Eventually this should be more intelligent, possibly packing
> initrd+dtb at the end of guest RAM.
> 
> Signed-off-by: Scott Wood <scottwood@freescale.com>

Thanks, applied to ppc-next.


Alex

> ---
> hw/ppc/e500.c |    2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
> index 6f0de6d..1ccfd7c 100644
> --- a/hw/ppc/e500.c
> +++ b/hw/ppc/e500.c
> @@ -36,7 +36,7 @@
> 
> #define BINARY_DEVICE_TREE_FILE    "mpc8544ds.dtb"
> #define UIMAGE_LOAD_BASE           0
> -#define DTC_LOAD_PAD               0x500000
> +#define DTC_LOAD_PAD               0x1800000
> #define DTC_PAD_MASK               0xFFFFF
> #define INITRD_LOAD_PAD            0x2000000
> #define INITRD_PAD_MASK            0xFFFFFF
> -- 
> 1.7.9.5
> 
> 

Re: [Qemu-devel] [PATCH 2/2] PPC: e500: calculate initrd_base like dt_base

[Alexander Graf]

On 23.08.2012, at 02:55, Scott Wood wrote:

> While investigating dtb pad issues, I noticed that initrd_base wasn't taking
> loadaddr into account the way dt_base was.  This seems wrong.
> 
> Signed-off-by: Scott Wood <scottwood@freescale.com>

Ah, all the images I tested start off from address 0. But yes, we should add the kernel load offset as well.

Thanks, applied to ppc-next.


Alex

> ---
> hw/ppc/e500.c |    3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
> index 1ccfd7c..60ddd85 100644
> --- a/hw/ppc/e500.c
> +++ b/hw/ppc/e500.c
> @@ -553,7 +553,8 @@ void ppce500_init(PPCE500Params *params)
> 
>     /* Load initrd. */
>     if (params->initrd_filename) {
> -        initrd_base = (kernel_size + INITRD_LOAD_PAD) & ~INITRD_PAD_MASK;
> +        initrd_base = (loadaddr + kernel_size + INITRD_LOAD_PAD) &
> +            ~INITRD_PAD_MASK;
>         initrd_size = load_image_targphys(params->initrd_filename, initrd_base,
>                                           ram_size - initrd_base);
> 
> -- 
> 1.7.9.5
> 
> 

Re: [Qemu-devel] [Qemu-ppc] [PATCH 2/2] PPC: e500: calculate initrd_base like dt_base

[folkert]

On Tue, Sep 25, 2012 at 09:49:08AM +0200, Alexander Graf wrote:
> > While investigating dtb pad issues, I noticed that initrd_base wasn't taking
> > loadaddr into account the way dt_base was.  This seems wrong.
> > 
> > Signed-off-by: Scott Wood <scottwood@freescale.com>
> 
> Ah, all the images I tested start off from address 0. But yes, we should add the kernel load offset as well.
> Thanks, applied to ppc-next.

Isn't the aix kernel starting at offset 16384?


Folkert van Heusden

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Re: [Qemu-devel] [Qemu-ppc] [PATCH 2/2] PPC: e500: calculate initrd_base like dt_base

[Scott Wood]

On 09/28/2012 02:52:15 PM, folkert wrote:
> On Tue, Sep 25, 2012 at 09:49:08AM +0200, Alexander Graf wrote:
> > > While investigating dtb pad issues, I noticed that initrd_base  
> wasn't taking
> > > loadaddr into account the way dt_base was.  This seems wrong.
> > >
> > > Signed-off-by: Scott Wood <scottwood@freescale.com>
> >
> > Ah, all the images I tested start off from address 0. But yes, we  
> should add the kernel load offset as well.
> > Thanks, applied to ppc-next.
> 
> Isn't the aix kernel starting at offset 16384?

I doubt the AIX kernel will run on e500. :-)

-Scott

Re: [Qemu-devel] [Qemu-ppc] [PATCH 2/2] PPC: e500: calculate initrd_base like dt_base

[Alexander Graf]

On 28.09.2012, at 21:52, folkert <folkert@vanheusden.com> wrote:

> On Tue, Sep 25, 2012 at 09:49:08AM +0200, Alexander Graf wrote:
>>> While investigating dtb pad issues, I noticed that initrd_base wasn't taking
>>> loadaddr into account the way dt_base was.  This seems wrong.
>>> 
>>> Signed-off-by: Scott Wood <scottwood@freescale.com>
>> 
>> Ah, all the images I tested start off from address 0. But yes, we should add the kernel load offset as well.
>> Thanks, applied to ppc-next.
> 
> Isn't the aix kernel starting at offset 16384?

AIX does not run on e500 style cores :)

Alex

> 
> 
> Folkert van Heusden
> 
> -- 
> MultiTail na wan makriki wrokosani fu tan luku den logfile nanga san
> den commando spiti puru. Piki puru spesrutu sani, wroko nanga difrenti
> kroru, tya kon makandra, nanga wan lo moro.
> http://www.vanheusden.com/multitail/
> ----------------------------------------------------------------------
> Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com