lkml.org 
[lkml]   [2011]   [Aug]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs
    On 08/25/2011 06:41 PM, H. Peter Anvin wrote:
    > On 08/25/2011 05:17 PM, Bjorn Helgaas wrote:
    >>
    >> If the OS allocated the next 128 bytes to another device, it sounds
    >> like it would cause a conflict on Intel boxes. This must be an area
    >> that differs between vendors. I haven't seen a spec that mentions 256
    >> bytes as the required minimum MMIO size for IOAPICs, and apparently
    >> the AMD IOAPIC decodes 240 bytes or fewer.
    >>
    >
    > For what it's worth, it's probably a bad idea on x86 for the OS to
    > allocate addresses in the 0xFExxxxxx range...
    >
    for system with more than one ioapic controllers, could have ioapic address rather low.
    and those address are allocated to some pci devices BAR by BIOS.

    Yinghai


    \
     
     \ /
      Last update: 2011-08-26 08:21    [W:0.020 / U:61.016 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site