Date: Mon, 9 Dec 2002 13:12:36 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: gagman@canada.com Cc: freebsd-questions@FreeBSD.ORG Subject: Re: DMA check causes fatal trap exception in FreeBSD 4.7 installation Message-ID: <20021209191234.GA4304@dan.emsphone.com> In-Reply-To: <20021209104515.21317.h005.c009.wm@mail.canada.com.criticalpath.net> References: <20021209104515.21317.h005.c009.wm@mail.canada.com.criticalpath.net>
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In the last episode (Dec 09), gagman@canada.com said: > I have a Pentium 533 MHz machine with 2 hard drives (10GB and 2GB). > Both drives are manufactured by Fujitsu. The Bios detects that the > first drive uses UDMA 4 and the second drive uses UDMA 2. When I run > hdparm tests on the drives with DMA turned on, my whole system > freezes up but the tests run fine on the second drive. In addition, > hdparm -i doesn't list UDMA-4 as one of the DMA modes for the first > drive. Now that I have given you the scenario, I would like to ask > you how can I disable the DMA check during FreeBSD installation as it > seems to be causing a fatal trap exception during the DMA check? Right at the bneginning of the boot process, you'll see a line that says: Hit [Enter] to boot immediately, or any other key for command prompt. Hit space there, then at the prompt, enter "set hw.ata.ata_dma=0", then enter "boot" to continue the boot process. Once the system is installed, edit (or create) the file /boot/loader.conf and put the line "hw.ata.ata_dma=0" in it. That should keep FreeBSD from trying to use DMA mode on the hard drives. You might want to check your cabling setup and BIOS versions, though. A DMA test shouldn't lock up the system. -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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