Dear Reinhard Meyer,
In message <4cdf04a8.4050...@emk-elektronik.de> you wrote:
>
> But whats left of my ideas is the following:
>
> in asm: set stack to end of SRAM (or whatever)
> (board-config.h would not subtract GENERATED_GBL_DATA_SIZE
> anymore)
>
> in c:
> board_early_init(void)
> {
> gd_t auto_gd;
> gd = &auto_gd;
>
> That would rid us of all alignment concerns:
> Setting stack to end of initial storage will certainly
> be aligned, and the auto_gd will be aligned as the
> toolchain deems necessary.
>
> We would not need GENERATED_GBL_DATA_SIZE anymore.
>
> The auto_gd space on stack will be valid even into the call
> to relocate_code.
This has but on tiny shortcoming: we use GD to pass data around, for
example to pass clock frequencies determind before relocation to the
code running after relocation - which means that GD must be of a
statically allocated storage class.
Your stack variable above will go out of scope as soon as we leave the
board_early_init() function...
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
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