[U-Boot-Users] What is u-boot relocation address?

[U-Boot-Users] What is u-boot relocation address?

[Vladimir Farcaller Pouzanov]

Hi all,

What does CFG_LOAD_ADDR mean and how it differs from TEXT_BASE in config.mk?

-- 
Sincerely,
Vladimir "Farcaller" Pouzanov
http://hackndev.com

[U-Boot-Users] What is u-boot relocation address?

[Andrew Dyer]

On 10/16/06, Vladimir Farcaller Pouzanov <farcaller@gmail.com> wrote:
> Hi all,
>
> What does CFG_LOAD_ADDR mean and how it differs from TEXT_BASE in config.mk?

find . -type f -print -exec grep CFG_LOAD_ADDR {} /dev/null \;

and a bit of work with a text editor will show you that CFG_LOAD_ADDR
is used as a default argument to commands that load something into
memory, like loadb, tftp, etc.  This is usually somewhere in DRAM.

TEXT_BASE is the starting address that u-boot is built for usually in
FLASH.  Later u-boot moves itself up to the top of available memory.

[U-Boot-Users] What is u-boot relocation address?

[Vladimir Farcaller Pouzanov]

Andrew Dyer wrote:

> TEXT_BASE is the starting address that u-boot is built for usually in
> FLASH.  Later u-boot moves itself up to the top of available memory.

Is it ok that TEXT_BASE of 0x0 leads to crash? Also U-boot seems to follow
TEXT_BASE value after relocation:

TEXT_BASE = 0xA1000000:
U-Boot code: A1000000 -> A1016290  BSS: -> A1018948

TEXT_BASE = 0xA1700000:
U-Boot code: A1700000 -> A1716290  BSS: -> A1718948

-- 
Sincerely,
Vladimir "Farcaller" Pouzanov
http://hackndev.com

[U-Boot-Users] What is u-boot relocation address?

[Vladimir Farcaller Pouzanov]

Vladimir "Farcaller" Pouzanov wrote:
> Is it ok that TEXT_BASE of 0x0 leads to crash? Also U-boot seems to follow
> TEXT_BASE value after relocation:

Now I'm completely confused...

CFG_MONITOR_BASE is u-boot startting location before relocation? 
CFG_FLASH_BASE is the same?
TEXT_BASE is... hm... (same as both constants above) 0x0? Doesn't work. And
shouldn't work:
        adr     r0, _start              /* r0 <- current position of code   */
        ldr     r1, _TEXT_BASE          /* test if we run from flash or RAM */
        cmp     r0, r1                  /* don't reloc during debug         */
        beq     stack_setup
_start == 0 so is _TEXT_BASE, result = no relocation and crash....

Please help :(

-- 
Sincerely,
Vladimir "Farcaller" Pouzanov
http://hackndev.com

[U-Boot-Users] What is u-boot relocation address?

[Vladimir Farcaller Pouzanov]

Vladimir "Farcaller" Pouzanov wrote:
> Vladimir "Farcaller" Pouzanov wrote:
>> Is it ok that TEXT_BASE of 0x0 leads to crash? Also U-boot seems to
>> follow TEXT_BASE value after relocation:

Seems that I've provided not enough information, so let's start from..hm..
beginning.

I'm trying to run u-boot on Palm Tungsten T3 handheld, PXA261 (ARM, same as
PXA250+16Mb flash). It works ok when executed from native OS
(TEXT_BASE=0xA1000000, u-boot.lds SECTION starts from 0xA1000000, u-boot is
copied to 0xA1000000). But I have problems from running it as native
bootloader from flash (0x0). I'm not sure how I should set all that
configuration defines. It seems to boot if u-boot.lds SECTION starts from
0x00000000 (TEXT_BASE still the same), but there are random crashes
in 'loady' and u-boot seems to freeze after ~30 sec. of serial inactivity.

-- 
Sincerely,
Vladimir "Farcaller" Pouzanov
http://hackndev.com

[U-Boot-Users] What is u-boot relocation address?

[Wolfgang Denk]

In message <eh0ei6$nhc$1@sea.gmane.org> you wrote:
> Vladimir "Farcaller" Pouzanov wrote:
> > Vladimir "Farcaller" Pouzanov wrote:
> >> Is it ok that TEXT_BASE of 0x0 leads to crash? Also U-boot seems to
> >> follow TEXT_BASE value after relocation:
> 
> Seems that I've provided not enough information, so let's start from..hm..
> beginning.
> 
> I'm trying to run u-boot on Palm Tungsten T3 handheld, PXA261 (ARM, same as

On ARM, TEXT_BASE must point to (initialized) RAM. If you set it to 0
(= ROM), then crashes must be expected.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
God made the integers; all else is the work of Man.       - Kronecker

[U-Boot-Users] What is u-boot relocation address?

[Vladimir Farcaller Pouzanov]

Wolfgang Denk wrote:
> On ARM, TEXT_BASE must point to (initialized) RAM. If you set it to 0
> (= ROM), then crashes must be expected.

Thanks for writing all that configuration settings values.

Can you give me any hint where I could start looking for 30sec. bug (random
crashes in 'loady' and u-boot seems to freeze after ~30 sec. of serial
inactivity)? I'm sure that my board init sequence is correct.

mtest works correctly, so SDRAM seems to be configured correctly.

-- 
Sincerely,
Vladimir "Farcaller" Pouzanov
http://hackndev.com

[U-Boot-Users] What is u-boot relocation address?

[Wolfgang Denk]

In message <eh0ars$6hk$1@sea.gmane.org> you wrote:
>
> Now I'm completely confused...

Then I recommend to read the source code.

> CFG_MONITOR_BASE is u-boot startting location before relocation? 

No, it's the start address of the U-Boot image in flash.

> CFG_FLASH_BASE is the same?

This may be, but is not always the case. Both are unrelated. But  the
following  should  always be true: CFG_FLASH_BASE <= CFG_MONITOR_BASE
<= CFG_FLASH_BASE + sizeof(your flash memory) - sizeof(u-boot image)

> TEXT_BASE is... hm... (same as both constants above) 0x0? Doesn't work. And

No, TEXT_BASE is something different. What exactly it is  depends  on
which architecture you're talking about.


Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"The good Christian should beware of mathematicians and all those who
make empty prophecies. The danger already exists that  mathematicians
have  made a covenant with the devil to darken the spirit and confine
man in the bonds of Hell."                          - Saint Augustine

[U-Boot-Users] What is u-boot relocation address?

[Wolfgang Denk]

In message <eh09f4$vh1$1@sea.gmane.org> you wrote:
> 
> Is it ok that TEXT_BASE of 0x0 leads to crash? Also U-boot seems to follow
> TEXT_BASE value after relocation:

Which architecture are you talking about?

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
If it went on at this rate, in several billion  years  he'd  be  rich
beyond his wildest dreams!            - Terry Pratchett, _Soul Music_

[U-Boot-Users] What is u-boot relocation address?

[Vladimir Farcaller Pouzanov]

Wolfgang Denk wrote:

> In message <eh09f4$vh1$1@sea.gmane.org> you wrote:
> Which architecture are you talking about?

PXA261 (arm)

-- 
Sincerely,
Vladimir "Farcaller" Pouzanov
http://hackndev.com

[U-Boot-Users] What is u-boot relocation address?

[Wolfgang Denk]

In message <eh05db$cnv$1@sea.gmane.org> you wrote:
> 
> What does CFG_LOAD_ADDR mean and how it differs from TEXT_BASE in config.mk?

CFG_LOAD_ADDR is the default setting for the load_addr variable, i. e.
the default load address.

And it has absolutely  nothing  to  do  with  TEXT_BASE  -  they  are
completely unrelated.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
An age is called Dark not because  the  light  fails  to  shine,  but
because people refuse to see it.           -- James Michener, "Space"