Introduce acpi_root_table=rsdt boot param and dmi list to force rsdt
Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
Tested-by: Mark Doughty <me@xxxxxxxxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 5 +++++
drivers/acpi/tables.c | 23 +++++++++++++++++++++++
2 files changed, 28 insertions(+)
Index: linux-acpi-2.6_video_native_vs_vendor/drivers/acpi/tables.c
===================================================================
--- linux-acpi-2.6_video_native_vs_vendor.orig/drivers/acpi/tables.c
+++ linux-acpi-2.6_video_native_vs_vendor/drivers/acpi/tables.c
@@ -32,6 +32,7 @@
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/bootmem.h>
+#include <linux/dmi.h>
#define PREFIX "ACPI: "
@@ -282,6 +283,23 @@ static void __init check_multiple_madt(v
return;
}
+static struct dmi_system_id acpi_rsdt_dmi_table[] = {
+ {
+ .ident = "ThinkPad ",
+ .matches = {
+ DMI_MATCH(DMI_BIOS_VENDOR, "IBM"),
+ DMI_MATCH(DMI_BIOS_VERSION, "1SET")},
+ },
+};
+
+static int __init acpi_force_rsdt(char *opt)
+{
+ if (!strcmp(opt, "rsdt"))
+ acpi_gbl_force_rsdt = 1;
+ return 0;
+}
+early_param("acpi_root_table", acpi_force_rsdt);
+
/*
* acpi_table_init()
*
@@ -293,6 +311,11 @@ static void __init check_multiple_madt(v
int __init acpi_table_init(void)
{
+ if (dmi_check_system(acpi_rsdt_dmi_table))
+ acpi_gbl_force_rsdt = 1;
+ if (acpi_gbl_force_rsdt)
+ printk(KERN_INFO "Using RSDT as ACPI root table\n");
+
acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
check_multiple_madt();
return 0;
Index: linux-acpi-2.6_video_native_vs_vendor/Documentation/kernel-parameters.txt
===================================================================
--- linux-acpi-2.6_video_native_vs_vendor.orig/Documentation/kernel-parameters.txt
+++ linux-acpi-2.6_video_native_vs_vendor/Documentation/kernel-parameters.txt
@@ -230,6 +230,11 @@ and is between 256 and 4096 characters.
to assume that this machine's pmtimer latches its value
and always returns good values.
+ acpi_root_table= [X86,ACPI]
+ { rsdt }
+ rsdt: If RSDP contains a non-NULL RSDT address, take it
+ for fetching ACPI tables (instead of XSDT)
+
agp= [AGP]
{ off | try_unsupported }
off: disable AGP support
--
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