Re: Relocating PPCBoot into SRAM

In message [ref] you wrote:

- On MPC75x and MPC7410 boards with MPC8260 in companion
  mode, SRAM on 1M and 2M respectively are available.

- Is it possible to relocate PPCBoot to this SRAM mapped
  as private memory? Note that, this is a second relocation;
  the first would already have occured when it is relocated
  from Flash to SDRAM.

This makes little sense to me. If you want to run  U-Boot  /  PPCBoot
from SRAM, then relocate it to that memory in the first place.

- And if this possible, a re-relocation from SRAM back to
  SDRAM?

Well, _everything_ is possible. But it is not wise  to  do  (or  try)
everything.

If this is possible, what needs to be done? The idea I
would like to explore is to do a full memory test (walking
bit, aligned/non-aligned access, refresh, alternating
pattern, random pattern test - basically extensive testing)
without executing PPCBoot in SDRAM.

You don't have to do is that complicated. There are many easier ways,
for ewxample: You can implement your memory  test  (which  should  be
non-destructive) as a U-Boot standalone application which gets loaded
into and started from SRAM. No nood to relocate U-Boot at all.

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
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