Date: Sun, 12 Feb 2012 11:13:53 -0700 From: Ian Lepore <freebsd@damnhippie.dyndns.org> To: Peter =?ISO-8859-1?Q?Ankerst=E5l?= <PETER@PEAN.ORG> Cc: freebsd-stable@freebsd.org Subject: Re: Disable DMA. Message-ID: <1329070433.7556.4.camel@revolution.hippie.lan> In-Reply-To: <E96E1542-EB91-49F9-BF3A-CB325395453D@PEAN.ORG> References: <mailpost.1328985856.6443596.12476.mailing.freebsd.stable@FreeBSD.cs.nctu.edu.tw> <4F36D0DA.4050208@FreeBSD.org> <E96E1542-EB91-49F9-BF3A-CB325395453D@PEAN.ORG>
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On Sun, 2012-02-12 at 10:29 +0100, Peter Ankerstål wrote: > On Feb 11, 2012, at 9:34 PM, Alexander Motin wrote: > > > On 02/11/12 20:15, Peter Ankerstål wrote: > >> In FreeBSD 8 i used the loader-variable hw.ata.ata_dma=0 to get my computer boot on a CF card. But > >> in FreeBSD 9.0 it doesn't seem to work. Could it be another variable or is it something else that doesn't work > >> in 9? The machine boots up the installer when the CF-card is not present but when it is present it stops right > >> after the "Timecounter" stuff. > > > > On 9.0 you can to it with > > hint.ata.X.mode=PIO4 > > , where X is a bus number. > > > > In recent 8/9-STABLE I've also resurrected hw.ata.ata_dma=0. > > > That works, thanks! It's also useful to try modes other than PIO4 when using the finer-grained mode= control. We've been disabling dma completely on SBCs with CF sockets for years due to the kind of lockup you mention, but I recently discovered that some units run just fine with mode=WDMA2 (but not any dma modes faster than that). -- Ian
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