[U-Boot] Linking some code to internal SRAM instead of SDRAM

[Alexander Stein]

Dear Wolfgang,

Am Mittwoch, 16. Juni 2010 14:56:31 schrieb Wolfgang Denk:
> > A new approach would be to link lowlevel_init directly at 0x00200000
> > (which is AT91SAM9260_SRAM0_BASE) but the code is located next to the
> > "normal" .text segment. I've prepared a change to
> > cpu/arm926ejs/u-boot.lds (I know it's still 2010.3 but that shouldn't
> > matter now) which links lowlevel_init to 0x00200000. I added the symbols
> > __lowlevel_init_start and __lowlevel_init_end to be used to copy the
> > function from it's LMA to it's VMA address.
> > I'm rather unsure if this will work as I thought, Of course more has to
> > be done, like
> > * Make SRAM address configureable
> > * Only link to this if CONFIG_SKIP_LOWLEVEL_INIT is not defined
> > * Maybe create a region for that
> > * ...
> > Any opinions, hints, more elegant methods?
> 
> Who loads the code to SRAM?

This code has to be added before bl here:
start.S:165-167
> #ifndef CONFIG_SKIP_LOWLEVEL_INIT
> 	bl	cpu_init_crit
> #endif
As start.S is generic to arm926ejs there have to be an extra #ifdef or 
something.

Best regards,
Alexander