Re: OSB4 issues on 2.4.19-ac4

From: Jonathan Lundell (
Date: Tue Aug 06 2002 - 15:58:11 EST

At 11:01 PM +0100 8/6/02, Alan Cox wrote:
>On Tue, 2002-08-06 at 19:55, Samuel Flory wrote:
>> It appears that the OSB4 ide controller isn't working on ac4. I have
>> a Tyan 2515, and 2518 which hang when dma is enabled.
>DMA enabled by you or by the driver. Right now the driver isnt supposed
>to be enabling DMA on OSB4

FWIW, we're building systems with OSB4s, and can consistently
generate the advertised IDE corruption if we enable Ultra DMA (this
is with RH 2.4.9-31, which has an extra OSB4 warning message; the
message correlates with on-disk corruption).

After suffering with PIO for a month or three, we did fairly
extensive testing with multiword DMA (non-Ultra), and are feeling
confident enough about it to leave it turned on.

/Jonathan Lundell.
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