path: root/Documentation
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authorIngo Molnar <mingo@elte.hu>2008-01-30 13:30:05 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:05 +0100
commit6e7c402590b75b6b45138792445ee0f0315a8473 (patch)
tree94db814d496502932ab55acc560a728925f87540 /Documentation
parentb02aae9cf52956dfe1bec73f77f81a3d05d3902b (diff)
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')
1 files changed, 7 insertions, 5 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9e605605842..b427b7c0e5d 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)
- 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