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>
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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.=20
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=20
/boot/loader.conf:
hw.ata.atapi_dma=3D0
hw.ata.ata_dma=3D0
Is this a known issue?=20
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=3D1 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.=20
Regards
Raphael
--=20
Raphael Becker <rabe@uugrn.org> http://rabe.uugrn.org/
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