From: Konrad Eisele <konrad@xxxxxxxxxxx>
Date: Tue, 06 Oct 2009 17:35:24 +0200
> Here is what we digged out:
> The virtual address regions with 512 MB ram and
> #define SRMMU_MAX_NOCACHE_PAGES (1280)
> are:
>
> 0xfc0000000 - 0xfc5000000 : nocache mem
> 0xfc5000000 - 0xfc9000000 : highmem
>
> however srmmu_nocache_init()->srmmu_early_allocate_ptable_skeleton()
> initializes the the page skelleton in steps of:
> ...
> while(start < end) {
> ...
> start = (start + PMD_SIZE) & PMD_MASK;
> }
> ...
>
> PMD_SIZE is 0x4000000, that means it will will initilize
>
> 0xfc0000000 - 0xfc4000000 and
> 0xfc4000000 - 0xfc8000000
> before it breaks.
I think you have found a genuine bug and maybe it explains
bugs others have run into over the past few years :-)
I'll do some more research on this tomorrow and apply some
kind of fix.
Thanks!
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