Date: Sat, 29 May 2004 23:21:46 +0200 From: Poul-Henning Kamp <phk@phk.freebsd.dk> To: current@FreeBSD.org Subject: boot2 patch, please test. Message-ID: <5104.1085865706@critter.freebsd.dk>
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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.
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