Date: Sat, 01 Jan 2005 14:33:19 +0200 From: Pertti Kosunen <pertti.kosunen@pp.nic.fi> To: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: [Fwd: Re: ad2: FAILURE - READ_DMA, but CD on slave controller recognized?] Message-ID: <41D6988F.2000604@pp.nic.fi>
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C. Fischer wrote: >this has started bugging me ever since moving from 4-stable to 5-stable. >"ad2", which had been recognized no problem on the former, fails on the >latter. since i have a multibooter, i can boot 4.10 residing on "ad2" without >trouble. 4.10 can access "ad0" and "ad1" fine (this is how i got the initial >install in place), but i used "ad2" for backups and this doesn't work anymore. > >the system otherwise works and there are no DMA related hardware errors ever >reported except for "ad2" not beeing recognized. this seems to indicate that >the problem lies in the initial disk checking phase. It's pretty common problem with 5.3, one solution is to: Disable DMA for boot. cat /boot/loader.conf hw.ata.ata_dma="0" hw.ata.atapi_dma="0" And enable first channel DMA later. cat /etc/rc.local atacontrol mode 0 udma4 udma4 http://lists.freebsd.org/pipermail/freebsd-stable/ Searchs previous messages for other workarounds. Disabling APIC might help.
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