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Date: Thu, 26 Dec 2002 17:42:29 +0100
From: Frank van Maarseveen <F.vanMaarseveen@inter.NL.net>
To: Tomas Szepe <szepe@pinerecords.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Alot of DMA errors in 2.4.18, 2.4.20 and 2.5.52
Message-ID: <20021226164229.GA26413@iapetus.localdomain>
References: <1040815160.533.6.camel@devcon-x> <20021225115820.GB7348@louise.pinerecords.com> <20021226123710.GA2442@iapetus.localdomain> <20021226132228.GE7348@louise.pinerecords.com>
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On Thu, Dec 26, 2002 at 02:22:28PM +0100, Tomas Szepe wrote:
> > 
> > hdparm -X69 /dev/hda will put it into UDMA5/ata100 mode as well
> > (69 == 64 + UDMA mode). No need to specify it at boot time.
> 
> Not true.  You definitely need to use the ideX boot param AND
> run hdparm -X?? /dev/hd? to make use of UDMA3+ on newer PDC
> controllers (unless you apply the patch posted on Dec 24 by
> Nikolai Zhubr).

Driver says otherwise on RH8.0 + 2.4.20:
iapetus /proc/ide# cat pdc202xx 

PROMISE Ultra series driver Ver 1.20.0.7 2002-05-23 Adapter: Ultra100 TX2
--------------- Primary Channel ---------------- Secondary Channel -------------
                enabled                          enabled 
66 Clocking     enabled                          enabled 
Mode            MASTER                           MASTER
--------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------
DMA enabled:    yes              no              no                no 
UDMA Mode:      5                0               0                 0
PIO Mode:       4                0               0                 0


-- 
Frank
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