Date: Thu, 28 Aug 2003 08:24:07 +0200 (CEST) From: Soren Schmidt <sos@spider.deepcore.dk> To: Anish Mistry <mistry.7@osu.edu> Cc: freebsd-current@FreeBSD.ORG Subject: Re: ATAng no PIO fallback? Message-ID: <200308280624.h7S6O8nr020810@spider.deepcore.dk> In-Reply-To: <200308271914.59403.mistry.7@osu.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
It seems Anish Mistry wrote: -- Start of PGP signed section. > On Tuesday 26 August 2003 10:27 pm, Anish Mistry wrote: > > After removing atapicam from my kernel, so no panics on boot I decided to > see > > it DMA was fixed for my CD/DVD combo drive. I changed the > > hw.ata.atapi_dma="0" > > to hw.ata.atapi_dma="1" in my /boot/loader.conf. After a reboot I tried to > > access my cdrom drive, and got the following error messages, which is very > > similar to the messages when trying to dma before ATAng: > > Aug 26 22:09:34 littleguy kernel: acd0: WARNING - READ_CD recovered from > > missing interrupt > > Aug 26 22:09:34 littleguy kernel: acd0: WARNING - READ_CD UDMA ICRC error > > (retrying request) > > > > The problem is that before with DMA enabled it would try dma a few times > fail, > > and then fall back to PIO, whcih though annoying still left the drive in a > > useable condition. Where as now the drive just stays stuck and unusable. > > > > ..... > Anyone thinking about looking into this? I'll just submit a PR, in a day or 2 > if there is no resposne. > Thanks, There is no PIO fallback in ATAng (so far), if you know that your ATAPI device doesn't do DMA why on earth do you enable it ? -Søren
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200308280624.h7S6O8nr020810>