Re: Nvidia cable detection problems (was [PATCH] amd74xx: don't configure udma mode higher than BIOS did)

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Hi,

On 2/5/07, Tejun Heo <htejun@xxxxxxxxx> wrote:
Alan wrote:
>> The *real* solution is to use the BIOS ACPI _GTM _STM methods for this.
>> Then you can remove all chipset specific knowledge from the IDE driver.
>> This is what the MS driver does on Windows, so you know it's received a
>> lot of testing from NVIDIA and board vendors.

Allen, thanks for quick reply.

Your mail explained the issue pretty well and saved us a lot of time.

> Well we can certainly do some of that if ACPI is present and active. In
> particular since _GTM will give us current modes allowing for hotplug and
> post BIOS boot kexec etc it ought to be safe to do Tejun's hack that way.
> We could even probe UDMA3+ capable devices by doing _STM to a high mode
> and _GTM to determine the cable type 8)

agreed

Glad to see the problem getting solved.  Now that we know the solution,
any volunteers?  :-)

Well, since you posted the initial patches and have the affected hardware... 8)

Thanks,
Bart
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