Date: Tue, 20 Jul 1999 23:44:11 +0200 (CEST) From: Soren Schmidt <sos@freebsd.dk> To: peter@netman.se (Peter Hakanson) Cc: gnats-admin@FreeBSD.ORG, freebsd-bugs@FreeBSD.ORG, peter@gbg.netman.se Subject: Re: kern/12450: IBM -DTTA-351010 corrupts data when using DMA 32-bit & multi-block i/o Message-ID: <199907202144.XAA47470@freebsd.dk> In-Reply-To: <Pine.BSO.4.10.9907202241370.21509-100000@spock.hq.gbg.netman.se> from Peter Hakanson at "Jul 20, 1999 10:45:58 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
It seems Peter Hakanson wrote: > Dear "gnats", > > my problem is solved, it might be interesting for you to know the > cause : > > The board i use (chaintech 5AGM2) has 2 possible "system frequencys" > for Cyrix-MII, 66 X 3.5 and 75 X 3 > > When using 75mhz the ibm disk cannot use DMA, it will > corrupt data. Quantum does work however. > > When switching to 66 X 3.5 both IBM and quantum works ok. Ahh, an overclocked system :) I'll bet that board uses a 37.5 MHz clock for the PCI bus when at 75MHz and then also for the IDE channels, putting the timings out of range... Well, you asked for trouble then :) -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199907202144.XAA47470>