[U-Boot] Trying to understand ARM926EJS/start.S
Wolfgang Denk
wd at denx.de
Sat Oct 30 21:21:16 CEST 2010
Dear Albert ARIBAUD,
In message <4CCC69E4.8090103 at free.fr> you wrote:
>
> > ldr r0, _TEXT_BASE /* r0<- Text base */
> > %%% why are we using _TEXT_BASE here and not _start?
>
> Because we're accessing the relocation tables in the FLASH (or freshly
> NAND-loaded) "source" copy of u-boot, not in the RAM "target" copy (in
> which the relocation tables won't exist).
Sorry, but I don't understand this explanation.
With the linker script we make sure that the symbol _start gets linked
to the absolute address CONFIG_SYS_TEXT_BASE, right? And _TEXT_BASE
is a storage that holds exactly the value CONFIG_SYS_TEXT_BASE, which
should be identical to the address of _start ?
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
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Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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