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    SubjectRe: [Bug] 2.6.18-rc6-mm2 i386 trouble finding RSDT in get_memcfg_from_srat
    On Thu, 2006-09-14 at 16:21 -0700, Dave Hansen wrote:
    > On Thu, 2006-09-14 at 19:04 -0400, Vivek Goyal wrote:
    > > I think I know what is going on wrong here. boot_ioremap() is assuming
    > > that only first 8MB of physical memory is being mapped and while
    > > calculating the index into page table (boot_pte_index) we will truncate
    > > any higher address bits.
    > Vivek, are those pte pages still all contiguous?
    > Yeah, that's probably it. Keith, I'm trying to think of reasons why we
    > need the mask here:
    > #define boot_pte_index(address) \
    > (((address) >> PAGE_SHIFT) & (BOOT_PTE_PTRS - 1))
    > and I can't think of any other than just masking out the top of the
    > virtual address. You could do this a bunch of other ways, like __pa().
    > This might just work:
    > static unsigned long boot_pte_index(unsigned long vaddr)
    > {
    > return __pa(vaddr) >> PAGE_SHIFT;
    > }
    and the above __pa(vaddr) >> PAGE_SHIFT changed things worked for me but
    I am still confused as to why the pte we set is c1686f6c and we flush
    and return c13db000.

    get_memcfg_from_srat: assigning address to rsdp fdfc0
    RSD PTR v0 [IBM ]
    rsdp->rsdt_address eff9c2c0
    boot_ioremap phys_addr = eff9c2c0 long = 44
    __boot_ioremap phys_addr = eff9c000 pages = 1 source c13db000
    setting pte c1686f6c to eff9c063
    just flushed c13db000
    boot_ioremap and I return c13db2c0
    rsdt = c13db2c0 header is RSDT4
    Begin SRAT table scan....


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      Last update: 2006-09-15 01:47    [W:0.051 / U:33.788 seconds]
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