Date: Fri, 2 Jan 2009 03:11:29 +0100 From: Raphael Becker <rabe@uugrn.org> To: freebsd-hardware@freebsd.org Subject: UDMA vs. VIA 82C686B Message-ID: <20090102021129.GA7331@ma.sigsys.de>
index | next in thread | raw e-mail
[-- Attachment #1 --]
Hi all,
I have had some problems with a VIA 82C686B UDMA100 controller with an
attached 2.5" Harddisk (Samsung-foo, 40GB) running 7.1-RELEASE (GENERIC):
UDMA-access is not possible even tough the HDD is able to do (in my
Laptop) and the controller claims to support UDMA100.
I tried a CF-Card with the same hardware running 6.2 or 6.3-RELEASE with
the same effect: some bad g_vfs-errors.
I got around this problem by adding (at least one of) the lines to
/boot/loader.conf:
hw.ata.atapi_dma=0
hw.ata.ata_dma=0
Is this a known issue?
Is there a workaround/patch for UDMA on this VIA-chipset?
Do you need more details on it?
It's kind of difficult to get the exact errors, because hw.ata.* seems
to be a read-only ("boot-only") sysctl and I have limited (serial)
access to the box. In case of hw.ata.ata_dma=1 I'm not able to unset
this value in /boot/loader.conf because I cannot write to the disk
because of the udma-errors then.
Regards
Raphael
--
Raphael Becker <rabe@uugrn.org> http://rabe.uugrn.org/
GnuPG: E7B2 1D66 3AF2 EDC7 9828 6D7A 9CDA 3E7B 10CA 9F2D
.........|.........|.........|.........|.........|.........|.........|..
[-- Attachment #2 --]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2 (FreeBSD)
iD8DBQFJXXfRnNo+exDKny0RAv81AKDnfjoAE0WJP3eeIUwpdrS4NC+87QCg3jJt
xHLkXRHkpyZpNtIy45RHZLc=
=h8Vn
-----END PGP SIGNATURE-----
help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090102021129.GA7331>