Date: Tue, 24 Feb 1998 16:08:02 -0600 From: "J. C. Vazquez" <jcvp@dextracode.com> To: hackers@FreeBSD.ORG Subject: Re: A "bus error" while doing outb()/inb() Message-ID: <34F344C2.6A0EDF21@dextracode.com> References: <34EDFC45.E2DC6C33@dextracode.com>
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J. C. Vazquez wrote:
> Hi there!
>
> I'm getting a "buss error" (signal SIGBUS) doing I/O with inb() and
> outb() to any
> port. This is running under FreeBSD 3.0-CURRENT, logged on as root.
> Before this, I
> do open("/dev/io",RW) and check any return error. gdb says that the
> signal was
> received in outbv()/inbv(). The following is an example:
>
> ¦#include <machine/cpufunc.h>
> ...
> outb(0x70, 0x0);
> x1=inb(0x71);
> outb(0x70, 0x02); /* <-------- a "buss error" here, core nicely
> dumped */
> ...
>
> Does anybody have an idea what's going on? Any help/comments will be
> highly
> appreciated. Thank you all.
>
> -jcvp-
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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Got it! I was closing the file descriptor used to open("/dev/io", RW).
Removed that close, everything works fine now. :)
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