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Date: Thu, 23 Mar 1995 21:51:25 -0800
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From: PVinci@ix.netcom.com (Paul Vinciguerra)
Subject: wdcommand() revisited ..
To: hackers@FreeBSD.org
Sender: hackers-owner@FreeBSD.org
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wdcommand ends as follows:
	outb(wdc + wd_command, command);
	return (0);
}

ATA states that we first have to check the status register to ensure 
command is ok.

	outb(wdc + wd_command, command);

	if ((inb(wdc +wd_status) & WDCS_ERR) != 0)
	return (-1)	/* or whatever error correction */

	return (0);
}