ACPI: tables: complete searching upon RSDP w/ bad checksum.
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: Len Brown <len.brown@intel.com>
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@ -207,8 +207,12 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
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"System description tables not found\n");
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return 0;
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}
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} else
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return acpi_find_rsdp();
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} else {
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acpi_physical_address pa = 0;
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acpi_find_root_pointer(&pa);
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return pa;
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}
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}
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void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
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