• Len Brown's avatar
    ACPI: tables: complete searching upon RSDP w/ bad checksum. · 239665a3
    Len Brown authored
    ACPI tables follow a tree structure in memory.
    The root of the tree is the RSDP (Root System Description Pointer).
    
    To find the RSDP, the OS searches for the signature "RSD PTR "
    in well known physical memory locations.  Then the OS computes
    a table checksum to verify that the signature is really part
    of a valid table header.
    
    Some systems have a proper signature but an invalid checksum;
    followed elsewhere by a proper signature with valid checksum.
    
    http://bugzilla.kernel.org/show_bug.cgi?id=9444
    
    The Linux RSDP scanning code bailed out on those systems
    and as a result they booted with ACPI disabled.
    
    Fix this by deleting the Linux RSDP scanning code and
    plugging in the ACPICA RSDP scanning code.
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    239665a3
osl.c 27.7 KB