Linux-kernel mailing list archive 1998-31,: Re: !!Warning!! UDMA and Fujitsu HD

# Re: !!Warning!! UDMA and Fujitsu HD

Peter T. Breuer (ptb@it.uc3m.es)
Tue, 4 Aug 1998 11:25:17 +0200 (MET DST)

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"A month of sundays ago Jamie Lokier wrote:"
>
> Please note I am using a VIA VP2/97-based motherboard (the FIC PA-2007),
> and I _have_ to use -X34 otherwise UDMA locks up my machine within a few

?? Do you mean that the board does udma automatically and that the
kernel lets it (ide0=autotune) and that then you turn off udma on the
disk, but not on the board ...

> days. -X34 or not makes no noticable difference to the results of
> hdparm -t. No data corruption as far as I am aware.

.. and that doesn't hurt? It's precisely what did lock my BX system.

I took (Gadi's?) patch for hdparm 3.3 but it only seems to enhance the
reporting capabilities of hdparm, not to add communication with the
kernel at any point. There wasn't much comment in the message I got -
and as far as I deciphered the message, lockups are deemed to be the
inevitable product of starting up in udma mode on motherboard and disk,
and then turning off udma on the disk only via hdparm -X34 (which puts
it into one of the multiword dma modes, I think).

Won't "ide0=noautotune" do?

One lesson is that the ide boot parameters should be less crytic!
"ide0=udma" maybe? And hdparm needs a little extension too.

>
> -- Jamie

Peter

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