From owner-freebsd-hardware  Thu Feb 18 14: 3:39 1999
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From: Kevin Day <toasty@home.dragondata.com>
Message-Id: <199902182203.QAA07420@home.dragondata.com>
Subject: Re: Accessing I/O ports
In-Reply-To: <01BE5B8E.8CA28F60@Dialup24.sknet.sk> from Pavol Beko at "Feb 18, 1999 10:31:44 pm"
To: beko@max.sknet.sk (Pavol Beko)
Date: Thu, 18 Feb 1999 16:03:14 -0600 (CST)
Cc: freebsd-hardware@FreeBSD.ORG
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> Hi,
> I'm new in programing under FreeBSD. I tried to write a simple program which will
> shut down my hard drive, but program ended up with signal 10 (SIGBUS).
> Shuting down the first IDE hard drive is accomplished by sending to I/O port 0x1f7
> value 0x99 trough outb() (from /machine/cpufunc.h) function. The same situation is
> when I try to access CMOS trough 0x70 and 0x71 I/O ports. There was no problem 
> with this under 'other' OS.
> What went wrong? Is there some part of kernel (some syscall) which is responsible 
> for handling  these low level operation?
> (machine is 486, EIDE HDs, FreeBSD 2.2.8)
> Thanks
> 
> 		Pavol
> 
> 
> 
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Try opening /dev/io first, then see if you have better luck.


Kevin


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