Date: Fri, 31 Mar 2000 16:54:22 +0400 From: Grigoriy Strokin <grg@philol.msu.ru> To: Thomas K?llmann <koellmann@gmx.net> Cc: freebsd-stable@freebsd.org Subject: Re: New kernel with its ATA drivers damages the filesystem Message-ID: <20000331165422.A19782@isabase.philol.msu.ru> In-Reply-To: <20000331142357.A1291@home.net>; from koellmann@gmx.net on Fri, Mar 31, 2000 at 02:23:57PM %2B0200 References: <20000331022130.A4045@isabase.philol.msu.ru> <20000331142357.A1291@home.net>
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On Fri, Mar 31, 2000 at 02:23:57PM +0200, Thomas K?llmann wrote:
> Grigoriy Strokin wrote/schrieb (Friday, March 31, 2000):
>
> | While the bug wiping out filesystems on machines with Apollo MVP3 when ATA
> | driver is in UDMA mode is being fixed, I suppose there at least should be some
> | note added to /usr/src/UPDATING, so that another users do not loss
> | all their data and have to reinitialize /usr and restore it from backup, as I
> | had to do?
> |
> | Something like that:
> |
> | If you use the Apollo MVP3 chipset, it is STRONGLY
> | recommended that you disable the use of DMA mode in ATA drivers
> | BEFORE you try to boot the system after `make installkernel'.
> | Add the following line:
> | /sbin/sysctl -w hw.atamodes=pio,pio,pio,pio
> | to the very beginning of your /etc/rc,
> | ~root/.profile and ~root/.login.
> | Be warned that if you don't disable the DMA mode,
> | all your filesystems may be corrupted because
> | of a bug in the driver that is still being fixed.
> |
>
> Please excuse if this was mentioned before (I did not follow this
> thread very closely), but isn't _not_ using
>
> options ATA_ENABLE_ATAPI_DMA
>
> enough as a measure of precaution?
>
> This is from LINT:
>
> # ATA_ENABLE_ATAPI_DMA: enable DMA on ATAPI device, since many ATAPI
> # devices claim to support DMA but doesn't actually work, this is
> # not enabled as default.
Unfortunately, no.
I don't know whether this option affect anything,
because I was using the GENERIC kernel
in which this option is commented out, and nevertheless
dmesg reports using UDMA-33, and
$ sysctl hw.atamodes
hw.atamodes: dma,---,dma,---,
So, the *default* GENERIC kernel could corrupt the disk
as ever it is being booted for the first time.
--
=== Grigoriy Strokin, Lomonosov University (MGU), Moscow ===
=== contact info: http://isabase.philol.msu.ru/~grg/ ===
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