From owner-freebsd-bugs  Fri Jan 12  1:10:21 2001
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Date: Fri, 12 Jan 2001 01:10:03 -0800 (PST)
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Cc: 
From: Soren Schmidt <sos@freebsd.dk>
Subject: Re: kern/24269: Failure to setup DMA on ATA HDs (Alladin V chipset). Was OK a week ago.
Reply-To: Soren Schmidt <sos@freebsd.dk>
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The following reply was made to PR kern/24269; it has been noted by GNATS.

From: Soren Schmidt <sos@freebsd.dk>
To: timonin@mindspring.com
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: kern/24269: Failure to setup DMA on ATA HDs (Alladin V chipset). Was OK a week ago.
Date: Fri, 12 Jan 2001 10:03:31 +0100 (CET)

 It seems timonin@mindspring.com wrote:
 > 
 > >Number:         24269
 > >Category:       kern
 > >Synopsis:       Failure to setup DMA on ATA HDs (Alladin V chipset). Was OK a week ago.
 > >Confidential:   no
 > >Severity:       non-critical
 > >Priority:       low
 > >Responsible:    freebsd-bugs
 > >State:          open
 > >Quarter:        
 > >Keywords:       
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Fri Jan 12 01:00:01 PST 2001
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Vladimir Timonin
 > >Release:        4.2
 > >Organization:
 > >Environment:
 > FreeBSD My.PC 4.2-STABLE FreeBSD 4.2-STABLE #13: Thu Jan 11 22:47:23 PST 2001 root@My.PC:/usr/src/sys/compile/NEWGEN i386
 > >Description:
 > After last upgrade (Jan 10) I lost DMA mode i/O on my hard disk drives.
 > Alladin V chipset
 >  ata channel 0 - master hd (UDMA2), slave CDROM (PIO4)
 >      channel 1 - master hd (UDMA2), slave CDRW (PIO4)
 > Looks like that init of the slave (pio) device cause switching off dma for hd drive.
 > Mount failure appears and after several retries HD I/O fallbacks
 > to PIO4.
 > 
 > >How-To-Repeat:
 > I think, that will be enough to configure one ata channel on Alladin V
 > board with UDMA master and PIO slave devices.
 > >Fix:
 > After I comment one statement in ata-dma.c
 > (line 316,317) things return back to previous (udma2/pio4, udma2/pio4)
 > happy times.
 > I comment (it is not a FIX)
 >  pci_write_config(parent, 0x54,
 >           pci_read_config(parent, 0x54, 4) & ~0x88880000, 4);
 
 A fix for this has been committed to -current, it is waiting to be MFC'd
 
 -Søren
 


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