---

yaml
---
r: 84181
b: refs/heads/master
c: d89e9d6
h: refs/heads/master
i:
  84179: 13dc325
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9cbc7960288d28aec95257af59854e1d14ba23b8
+refs/heads/master: d89e9d6b4930c6505ac3ed35f57ab7f4311d6cf6

trunk/Documentation/acpi/dsdt-override.txt

@@ -0,0 +1,15 @@
+Linux supports two methods of overriding the BIOS DSDT:
+
+CONFIG_ACPI_CUSTOM_DSDT builds the image into the kernel.
+
+CONFIG_ACPI_CUSTOM_DSDT_INITRD adds the image to the initrd.
+
+When to use these methods is described in detail on the
+Linux/ACPI home page:
+http://www.lesswatts.org/projects/acpi/overridingDSDT.php
+
+Note that if both options are used, the DSDT supplied
+by the INITRD method takes precedence.
+
+Documentation/initramfs-add-dsdt.sh is provided for convenience
+for use with the CONFIG_ACPI_CUSTOM_DSDT_INITRD method.

trunk/Documentation/acpi/initramfs-add-dsdt.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# Adds a DSDT file to the initrd (if it's an initramfs)
+# first argument is the name of archive
+# second argument is the name of the file to add
+# The file will be copied as /DSDT.aml
+
+# 20060126: fix "Premature end of file" with some old cpio (Roland Robic)
+# 20060205: this time it should really work
+
+# check the arguments
+if [ $# -ne 2 ]; then
+	program_name=$(basename $0)
+	echo "\
+$program_name: too few arguments
+Usage: $program_name initrd-name.img DSDT-to-add.aml
+Adds a DSDT file to an initrd (in initramfs format)
+
+  initrd-name.img: filename of the initrd in initramfs format
+  DSDT-to-add.aml: filename of the DSDT file to add
+  " 1>&2
+    exit 1
+fi
+
+# we should check it's an initramfs
+
+tempcpio=$(mktemp -d)
+# cleanup on exit, hangup, interrupt, quit, termination
+trap 'rm -rf $tempcpio' 0 1 2 3 15
+
+# extract the archive
+gunzip -c "$1" > "$tempcpio"/initramfs.cpio || exit 1
+
+# copy the DSDT file at the root of the directory so that we can call it "/DSDT.aml"
+cp -f "$2" "$tempcpio"/DSDT.aml
+
+# add the file
+cd "$tempcpio"
+(echo DSDT.aml | cpio --quiet -H newc -o -A -O "$tempcpio"/initramfs.cpio) || exit 1
+cd "$OLDPWD"
+
+# re-compress the archive
+gzip -c "$tempcpio"/initramfs.cpio > "$1"
+

trunk/drivers/acpi/Kconfig

@@ -263,8 +263,10 @@ config ACPI_CUSTOM_DSDT
 	depends on !STANDALONE
 	default n 
 	help
-	  This option is to load a custom ACPI DSDT
-	  If you don't know what that is, say N.
+	  This option supports a custom DSDT by linking it into the kernel.
+	  See Documentation/acpi/dsdt-override.txt
+
+	  If unsure, say N.
 
 config ACPI_CUSTOM_DSDT_FILE
 	string "Custom DSDT Table file to include"
@@ -279,17 +281,11 @@ config ACPI_CUSTOM_DSDT_INITRD
 	depends on BLK_DEV_INITRD
 	default n
 	help
-	  The DSDT (Differentiated System Description Table) often needs to be
-	  overridden because of broken BIOS implementations. If this feature is
-	  activated you will be able to provide a customized DSDT by adding it
-	  to your initramfs. If your mkinitrd tool does not support this feature
-	  a script is provided in the documentation. For more details see
-	  <file:Documentation/dsdt-initrd.txt> or <http://gaugusch.at/kernel.shtml>.
-	  If there is no table found, it will fall-back to the custom DSDT
-	  in-kernel (if activated) or to the DSDT from the BIOS.
-
-	  Even if you do not need a new one at the moment, you may want to use a
-	  better DSDT later. It is safe to say Y here.
+	  This option supports a custom DSDT by optionally loading it from initrd.
+	  See Documentation/acpi/dsdt-override.txt
+
+	  If you are not using this feature now, but may use it later,
+	  it is safe to say Y here.
 
 config ACPI_BLACKLIST_YEAR
 	int "Disable ACPI for systems before Jan 1st this year" if X86_32