On Thursday 03 January 2008, Rafal Jaworowski wrote:
- Does it really hold true that QNX requires d-cache disabled upon
passing control to it?
- If so, this is a custom QNX thing that belongs to do_bootm_qnxelf()
and should be handled there and not at the common ELF handling level.
Hmmm. I think that calling applications and especially OS'es is more safe with caches disabled then with caches enabled.
Yeah, after a second thought I tend to agree. Maybe the way to go is doing data cache flush from within dcache_disable() properly i.e. bring it in for arch variations that don't do it currently like 85xx... Actually to confirm my observations I tested a working patch that flushes d-cache at cache_disable() just like 86xx and it works for me, this is: my problems disappear. Do you think this is a better option?
Yes, I think this is the way to go. Please provide a patch and send it to the 85xx maintainer. Best would be if you could check the other ARCH's (at least PPC) for this dcache_disable() behaviour too.
Thanks.
Best regards, Stefan
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