[U-Boot-Users] set up stack before board_init_f() on ppc440 core?
shawnxjin at gmail.com
Fri Feb 25 23:56:17 CET 2005
> Which part of section "Initial Stack, Global Data" in the README
> don't you understand?
Thanks for pointing out the section. I didn't read it through before. :(
> > stack in DCACHE (Walnut 405 is an example). But the CFG_INIT_RAM_ADDR
> > is 0x40000000, which is inside SDRAM. Why was it commented that the
> No, this is not inside SDRAM. There is no board (yet) with 1 GB of
Well, "inside SDRAM" is what is commented on WALNUT.h. Now I
understand the value of CFG_INIT_RAM_ADDR is better not to interfere
with the system design.
> In short: cache is like normal memory, just very fast (which does not
> play a role here). We just have to make sure that no cache fills or
> cache flushes will be done (at least not for that part of the data
> cache which is being used for the initial stack).
I don't see any caches are in a system memory mapping. Then I thought
it could be only accessed by those cache specific instructions, like
dcread. That's my misunderstanding.
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