Date: Sat, 22 Nov 1997 12:13:07 -0800 From: David Greenman <dg@root.com> To: "John W. DeBoskey" <jwd@unx.sas.com> Cc: freebsd-current@freebsd.org Subject: Re: fxp0 causes machine lockup Message-ID: <199711222013.MAA08065@implode.root.com> In-Reply-To: Your message of "Thu, 20 Nov 1997 23:07:08 EST." <199711210407.AA10760@iluvatar.unx.sas.com>
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> With respect to the following problem, the solution came from >an unexpected location. > > I asked our hardware support folks for a 2nd motherboard to see >if the problem was specific to the hardware. Before getting the >new MB, they suggested I upgrade the bios on my machine... I said >sure, thinking FreeBSD doesn't use the bios, what could happen? > > Dell OptiPlex PPro 200 with bios rev A00(Phoenix) flashed to A08. > > The problem went away. > > Could someone give me a short explanation of how the bios update >could fix my apparent dma problem? Does the bios assign dma channels >or something associated? The BIOS programs the motherboard chipset; it configures among other things the various settings that control PCI DMA behavior. If the MB chipset is misconfigured, then bad things can happen. > Anyways, I have now tested rev 0, 2, & 4 fxp NICs with complete >success. Thanks for the note. BTW, does you machine have the 82557+82555 combination or does it have an 82558 chip? -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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