Commit graph

5 commits

Author SHA1 Message Date
Ingo Molnar
3c1ca43faf Merge branch 'x86/setup' into x86/devel 2008-07-08 09:43:01 +02:00
H. Peter Anvin
aa60d13fb0 x86: setup: issue a null command after enabling A20 via KBC
Apparently, DOS and possibly other legacy operating systems issued a
null command to the keyboard controller after toggling A20,
specifically "pulse output pins" with no output pins specified.  This
was presumably done for synchronization reasons.  This has made it
into at least the UHCI spec, and it has been found to cause
compatibility problems when "legacy USB" is enabled (which it almost
always is) to not have this byte sent.

It is *NOT* clear if any of these compatibility problems has any
effect on Linux.  However, for maximum compatibility, issue this null
command after togging A20 through the KBC.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2008-06-27 13:29:01 -07:00
Manish Katiyar
52aaa12fbe x86: fix unused variable 'loops' warning in arch/x86/boot/a20.c
Following patch fixes the below warning message :
arch/x86/boot/a20.c:118: warning: unused variable 'loops'

Signed-off-by : Manish Katiyar <mkatiyar@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-06-12 21:27:05 +02:00
WANG Cong
cf9b111c17 x86: remove pointless comments
Remove old comments that include the old arch/i386 directory.

Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-04-19 19:19:54 +02:00
Thomas Gleixner
96ae6ea0be i386: move boot
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2007-10-11 11:16:45 +02:00
Renamed from arch/i386/boot/a20.c (Browse further)