Re: (was Re: [RFC] IDE 80-core cable detect - chipset-specific code to over-ride eighty_ninty_three())
From: Bartlomiej Zolnierkiewicz
Date: Fri Feb 13 2004 - 13:29:51 EST
On Friday 13 of February 2004 18:44, Erik Mouw wrote:
> On Fri, Feb 13, 2004 at 06:23:53PM +0100, Bartlomiej Zolnierkiewicz wrote:
> > Great, but I wonder why cable bits are set incorrectly.
> > Probably it's a BIOS bug, maybe BIOS update will help?
> I think there is something wrong in the cable detection code. I've
> tried chasing the bug a couple of weeks ago, but got distracted by
> other work. On an AMD-768 based motherboard disks run in UDMA5 without
> problem using linux-2.4.20, but on 2.4.24 (or anything with the new IDE
> code), I can't get any further than UDMA2. At first glance it looks
> like the 80-pin bits in the chipset registers aren't set. When I
> manually force them, the driver has no problem running the disks in
> So far I've seen this behaviour with the following chipset:
> Bus 0, device 7, function 1:
> IDE interface: Advanced Micro Devices [AMD] AMD-768 [Opus] IDE (rev 4).
> Master Capable. Latency=32.
> I/O at 0xd800 [0xd80f].
It might be also chipset specific bug:
2.4.20 - amd74xx.c driver by Andre Hedrick
2.4.21-2.4.24 - new amd74xx.c driver by Vojtech Pavlik
Please try narrow it down.
> But rumours are that even on Intel ICH2 it goes wrong (haven't
> confirmed this myself).
This tells us nothing about the problem.
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