boot2 patch, please test.
From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 05/29/04
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To: current@FreeBSD.org Date: Sat, 29 May 2004 23:21:46 +0200
Some embedded boxes do not have the keyboard controller, and this
patch adds a timeout so they do not get stuck waiting for it to
become ready.
Please test that this patch does not have any effect on normal
PC architecture machines.
Index: i386/boot2/boot1.S
===================================================================
RCS file: /home/ncvs/src/sys/boot/i386/boot2/boot1.S,v
retrieving revision 1.27
diff -u -r1.27 boot1.S
--- i386/boot2/boot1.S 14 May 2004 20:29:29 -0000 1.27
+++ i386/boot2/boot1.S 29 May 2004 19:49:52 -0000
@@ -203,7 +203,9 @@
* Enable A20 so we can access memory above 1 meg.
*/
seta20: cli # Disable interrupts
-seta20.1: inb $0x64,%al # Get status
+seta20.1: dec %cx
+ jz seta20.3
+ inb $0x64,%al # Get status
testb $0x2,%al # Busy?
jnz seta20.1 # Yes
movb $0xd1,%al # Command: Write
@@ -213,6 +215,7 @@
jnz seta20.2 # Yes
movb $0xdf,%al # Enable
outb %al,$0x60 # A20
+seta20.3:
sti # Enable interrupts
retw # To caller
/*
-- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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