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| author | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:05 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:05 +0100 |
| commit | 6e7c402590b75b6b45138792445ee0f0315a8473 (patch) | |
| tree | 94db814d496502932ab55acc560a728925f87540 /Documentation | |
| parent | b02aae9cf52956dfe1bec73f77f81a3d05d3902b (diff) | |
| download | lwn-6e7c402590b75b6b45138792445ee0f0315a8473.tar.gz lwn-6e7c402590b75b6b45138792445ee0f0315a8473.zip | |
x86: various changes and cleanups to in_p/out_p delay details
various changes to the in_p/out_p delay details:
- add the io_delay=none method
- make each method selectable from the kernel config
- simplify the delay code a bit by getting rid of an indirect function call
- add the /proc/sys/kernel/io_delay_type sysctl
- change 'io_delay=standard|alternate' to io_delay=0x80 and io_delay=0xed
- make the io delay config not depend on CONFIG_DEBUG_KERNEL
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: "David P. Reed" <dpreed@reed.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 9e6056058425..b427b7c0e5d0 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -795,12 +795,14 @@ and is between 256 and 4096 characters. It is defined in the file then look in the higher range. io_delay= [X86-32,X86-64] I/O delay method - standard - Standard port 0x80 delay - alternate - Alternate port 0xed delay + 0x80 + Standard port 0x80 based delay + 0xed + Alternate port 0xed based delay (needed on some systems) udelay - Simple two microsecond delay + Simple two microseconds delay + none + No delay io7= [HW] IO7 for Marvel based alpha systems See comment before marvel_specify_io7 in |