From owner-freebsd-bugs  Sun Mar 12 08:18:29 1995
Return-Path: bugs-owner
Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id IAA19637 for bugs-outgoing; Sun, 12 Mar 1995 08:18:29 -0800
Received: from clinet.fi (root@clinet.fi [193.64.6.1]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id IAA19631 for <freebsd-bugs@freefall.cdrom.com>; Sun, 12 Mar 1995 08:18:25 -0800
Received: from katiska.clinet.fi (root@katiska.clinet.fi [193.64.6.3]) by clinet.fi (8.6.10/8.6.4) with ESMTP id SAA17905 for <freebsd-bugs@freefall.cdrom.com>; Sun, 12 Mar 1995 18:18:13 +0200
From: Heikki Suonsivu <hsu@clinet.fi>
Received: (root@localhost) by katiska.clinet.fi (8.6.10/8.6.4) id SAA04225; Sun, 12 Mar 1995 18:18:11 +0200
Date: Sun, 12 Mar 1995 18:18:11 +0200
Message-Id: <199503121618.SAA04225@katiska.clinet.fi>
To: freebsd-bugs@freefall.cdrom.com
Subject: NCR SCSI fails
Reply-To: Heikki Suonsivu <hsu@cs.hut.fi>
Organization: Helsinki University of Technology, Otaniemi, Finland
Sender: bugs-owner@FreeBSD.org
Precedence: bulk


This failed on our P60 motherboard with NCR SCSI, is this a broken
motherboard, configuration problem or something else?

/*==========================================================
**
**
**	Test the pci bus snoop logic :-(
**
**	Has to be called with interrupts disabled.
**
**
**==========================================================
*/

#ifndef NCR_IOMAPPED
static int ncr_regtest (struct ncb* np)
{
	register volatile u_long data, *addr;
	/*
	**	ncr registers may NOT be cached.
	**	write 0xffffffff to a read only register area,
	**	and try to read it back.
	*/
	addr = (u_long*) &np->reg->nc_dstat;
	data = 0xffffffff;
	*addr= data;
	data = *addr;
#if 1
	if (data == 0xffffffff) {
#else
	if ((data & 0xe2f0fffd) != 0x02000080) {
#endif
		printf ("CACHE TEST FAILED: reg dstat-sstat2 readback %x.\n",
			(unsigned) data);
		return (0x10);
	};
	return (0);
}
#endif


-- 
Heikki Suonsivu, T{ysikuu 10 C 83/02210 Espoo/FINLAND,
hsu@cs.hut.fi  home +358-0-8031121 work -4513377 fax -4555276  riippu SN