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Date: Tue, 8 Oct 2002 15:14:25 -0400 (EDT)
From: Bill Davidsen <davidsen@tmr.com>
To: Nick Sanders <sandersn@btinternet.com>
cc: Zwane Mwaikambo <zwane@linuxpower.ca>, Andrew Morton <akpm@digeo.com>,
       szonyi calin <caszonyi@yahoo.com>, linux-kernel@vger.kernel.org
Subject: Re: Kernel 2.5.40 DMA and mm issues
In-Reply-To: <200210051207.39518.sandersn@btinternet.com>
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On Sat, 5 Oct 2002, Nick Sanders wrote:

> On Friday 04 October 2002 9:12 pm, Zwane Mwaikambo wrote:
> > On Fri, 4 Oct 2002, Nick Sanders wrote:
> > > I get the same 'DMA disabled' messages with 2.5 but DMA is never actually
> > > disabled so I wouldn't rely on them being accurate (see below)
> > >
> > > Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
> > > ide: Assuming 33MHz system bus speed for PIO modes; override with
> > > idebus=xx VP_IDE: IDE controller at PCI slot 00:11.1
> > > PCI: Hardcoded IRQ 14 for device 00:11.1
> > > VP_IDE: chipset revision 6
> > > VP_IDE: not 100% native mode: will probe irqs later
> > > ide: Assuming 33MHz system bus speed for PIO modes; override with
> > > idebus=xx VP_IDE: VIA vt8233a (rev 00) IDE UDMA133 controller on
> > > pci00:11.1 ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hda:DMA, hdb:DMA
> > > ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdc:DMA, hdd:pio hda: WDC
> > > WD400BB-00CAA0, ATA DISK drive
> > > hdb: TOSHIBA DVD-ROM SD-M1402, ATAPI CD/DVD-ROM drive
> > > hda: DMA disabled
> > > hdb: DMA disabled
> > > ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> > > hdc: LITE-ON LTR-24102B, ATAPI CD/DVD-ROM drive
> > > hdc: DMA disabled
> > > ide1 at 0x170-0x177,0x376 on irq 15
> > > hda: host protected area => 1
> > > hda: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=4865/255/63,
> > > UDMA(100)
> >
> > IIRC not according to that line.
> >
> 
> What line? All I meant was that the 'hda: DMA disabled' lines didn't actually 
> disable DMA unless it's reenabled quietly somewhere later on. 

Some systems, such as Redhat, seem to enable DMA for disks. You *may* be
able to boot single and avoid this.

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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