Date: Thu, 09 Dec 2004 21:04:19 +0900 From: Rob <spamrefuse@yahoo.com> To: freebsd-stable@freebsd.org Subject: Re: hw.ata.ata_dma="0": can I do this during bootup at the loader prompt? Message-ID: <41B83F43.3060102@yahoo.com> In-Reply-To: <d86b487304120903475c4e6cc0@mail.gmail.com> References: <41B7E193.4090807@yahoo.com> <d86b487304120903475c4e6cc0@mail.gmail.com>
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Arjan Van Leeuwen wrote: > On Thu, 09 Dec 2004 14:24:35 +0900, Rob <spamrefuse@yahoo.com> wrote: > >>Hi, >> >>In /boot/loader.conf, I have >> hw.ata.ata_dma="0" >>to prevent a WRITE_DMA failure crash at bootup. >>Unfortunately, this forces my UDMA100 harddisk to operate >>at PIO4 speed. >> >>There are patches flying around on this mailing list that might >>solve the problem. I'm very keen on testing such patches, but I >>should remove the line in loader.conf. However, if the patch does >>not work, I end up with an unbootable disk. >> >>It would be nice if I can set hw.ata.ata_dma="0" at the loader >>prompt during bootup, so that the system at least will boot from >>harddisk. Is that possible? >> > > > I'm not sure if I understand what you want, but you can use eg > 'atacontrol mode <channel> udma33 udma33' to set your hard drive to > UDMA-33 after the system has booted. No, that's no option. The situation is this: I have a harddisk with FreeBSD 5.3, which fails to boot. It would boot if I had hw.ata.ata_dma="0" in /boot/loader.conf; however, that file is empty, so the bootup crashes with a WRITE_DMA failure when the kernel loads. I can get at the bootloader prompt during the boot. What I want to know is: can I type something here that has the same effect as hw.ata.ata_dma="0" in /boot/loader.conf? Then I can continue loading the kernel. Thanks, Rob.
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