Date: Thu, 28 Aug 2003 10:40:15 -0400 From: Anish Mistry <mistry.7@osu.edu> To: Soren Schmidt <sos@spider.deepcore.dk> Cc: freebsd-current@freebsd.org Subject: Re: ATAng no PIO fallback? Message-ID: <200308281040.15343.mistry.7@osu.edu> In-Reply-To: <200308280624.h7S6O8nr020810@spider.deepcore.dk> References: <200308280624.h7S6O8nr020810@spider.deepcore.dk>
next in thread | previous in thread | raw e-mail | index | archive | help
[-- Attachment #1 --] On Thursday 28 August 2003 02:24 am, you wrote: > 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 ? > Because the drive does support DMA. I've tested to see it DMA actually works in windows, PIO vs DMA while playing a DVD, and there is a big difference, and I can only assume that it works. > -Søren > > -- Anish Mistry [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (FreeBSD) iD8DBQA/ThRPxqA5ziudZT0RAkcUAJ9ZvxK0YJIuzodO/CpvdG8QtpkQAgCbBMMz /5tXA+tiUCLrxGHZ8m9z3kI= =ajF3 -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200308281040.15343.mistry.7>