Overriding DSDT Tables with external files - 2 Methods

There seem to be 2 closely related methods of overriding the DSDT in a
BIOS with your own files.

My question is... Do they both work? If they do both work, is one
prefered over the other?

***********************************
Method 1 (from http://www.cpqlinux.com/acpi-howto.html and others)

1. get the dsdt.hex file

2. cp -a dsdt.hex to drivers/acpi/tables/acpi_dsdt.c

3. apply  the following patch

--- linux/drivers/acpi/osl.c    Sat Jul 13 16:16:25 2002
+++ linux-2.4.18-xfs-acpi/drivers/acpi/osl.c    Sat Jul 13 14:33:09 2002

@@ -70,6 +70,7 @@
 static OSD_HANDLER acpi_irq_handler = NULL;
 static void *acpi_irq_context = NULL;

+extern unsigned char AmlCode[];

 acpi_status
 acpi_os_initialize(void)

@@ -221,7 +222,10 @@
        if (!existing_table || !new_table)
                return AE_BAD_PARAMETER;

-       *new_table = NULL;
+       if (strncmp(existing_table->signature, "DSDT", 4) == 0)
+               *new_table = (acpi_table_header*)AmlCode;
+       else
+               *new_table = NULL;
        return AE_OK;
 }

***********************************
Method 2 (from Christophe Boyanique) :

1. get the dsdt.hex file

2. copy that file into drivers/acpi

3. patch drivers/acpi/osl.c as follows:

diff -urP drivers/acpi/osl.c /usr/src/linux/drivers/acpi/osl.c
 --- drivers/acpi/osl.c  Mon Jul 29 23:30:42 2002
 +++ /usr/src/linux/drivers/acpi/osl.c   Sat Jul 27 18:32:34 2002
 @@ -71,6 +71,9 @@
  static void *acpi_irq_context = NULL;
 
 
 +#include "dsdt.hex"
 +acpi_table_header *myDST = (acpi_table_header *) AmlCode;
 +
  acpi_status
  acpi_os_initialize(void)
  {
 @@ -221,7 +224,10 @@
         if (!existing_table || !new_table)
                 return AE_BAD_PARAMETER;
 
 -       *new_table = NULL;
 +       if (!strncmp(existing_table->signature, DSDT_SIG, 4))
 +               *new_table = myDST;
 +       else
 +               *new_table = NULL;
         return AE_OK;
  }


-- 
John M. Trostel
Senior Software Engineer
Quantum Corp.
john.trostel-+vhbC7un7QRBDgjK7y7TUQ@public.gmane.org



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