Re: (was Re: [RFC] IDE 80-core cable detect - chipset-specific code to over-ride eighty_ninty_three())

[Erik Mouw]

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
UDMA5.

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].

But rumours are that even on Intel ICH2 it goes wrong (haven't
confirmed this myself).

FWIW, I'm using modular IDE, I still have to test it with IDE built
into the kernel.


Erik

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