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ACPI: basic initramfs DSDT override support

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The basics of DSDT from initramfs. In case this option is selected,
populate_rootfs() is called a bit earlier to have the initramfs content
available during ACPI initialization.

This is a very similar path to the one available at
http://gaugusch.at/kernel.shtml but with some update in the
documentation, default set to No and the change of populate_rootfs() the
"Jeff Mahony way" (which avoids reading the initramfs twice).

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Markus Gaugusch
2008-02-05 00:04:06 +01:00
committed by Len Brown
parent 488b5ec871
commit 71fc47a9ad
5 changed files with 199 additions and 5 deletions
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8
init/initramfs.c
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@@ -538,7 +538,7 @@ skip:
initrd_end = 0;
}
static int __init populate_rootfs(void)
int __init populate_rootfs(void)
{
char *err = unpack_to_rootfs(__initramfs_start,
__initramfs_end - __initramfs_start, 0);
@@ -577,4 +577,10 @@ static int __init populate_rootfs(void)
}
return 0;
}
#ifndef CONFIG_ACPI_CUSTOM_DSDT_INITRD
/*
* if this option is enabled, populate_rootfs() is called _earlier_ in the
* boot sequence. This insures that the ACPI initialisation can find the file.
*/
rootfs_initcall(populate_rootfs);
#endif