Re: Using an external DSDT file with 2.4.19?

[Troy Schultz <tschultz-zzOxFVvAfJPQT0dZR+AlfA@public.gmane.org>]

I just went through this on the weekend, here is what I did.

change the name of the newly compiled DSDT.hex file to acpi_dsdt.c and
place it in the kernel tree under ../drivers/acpi/tables.

Then apply the following patch:
***BEGIN***
--- /usr/src/linux-2.4.19-acpi-20020821/drivers/acpi/osl.c.orig	Sun Sep  1 11:16:04 2002
+++ /usr/src/linux-2.4.19-acpi-20020821/drivers/acpi/osl.c	Sun Sep  1 11:16:54 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;
 }
 
***END***

This worked very well for me with kernel 2.4.19.

Best Regards
- Troy





On Thu, 2002-09-05 at 13:41, John M Trostel wrote:
> I am now trying to use an external DSDT file (file.hex) to override what
> was written in the BIOS.  Unfortunately, I can't quite figure out how to
> get this file read rather than BIOS.  I see :
> 
>  http://www.cpqlinux.com/acpi-howto.html
> 
> but don't see how this will apply against the current 2.4.19 stuff.
> 
> -- 
> John M. Trostel
> Senior Software Engineer
> Quantum Corp.
> john.trostel-+vhbC7un7QRBDgjK7y7TUQ@public.gmane.org
> 
> 
> 
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