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ACPI: tables: complete searching upon RSDP w/ bad checksum.

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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>
This commit is contained in:
Len Brown
2007-11-23 20:08:02 -05:00
parent 2ffbb8377c
commit 239665a3bb
7 changed files with 23 additions and 60 deletions
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4
drivers/acpi/tables/tbxfroot.c
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@@ -100,7 +100,7 @@ static acpi_status acpi_tb_validate_rsdp(struct acpi_table_rsdp *rsdp)
/*******************************************************************************
*
* FUNCTION: acpi_tb_find_rsdp
* FUNCTION: acpi_find_root_pointer
*
* PARAMETERS: table_address - Where the table pointer is returned
*
@@ -219,8 +219,6 @@ acpi_status acpi_find_root_pointer(acpi_native_uint * table_address)
return_ACPI_STATUS(AE_NOT_FOUND);
}
ACPI_EXPORT_SYMBOL(acpi_find_root_pointer)
/*******************************************************************************
*
* FUNCTION: acpi_tb_scan_memory_for_rsdp