[plug] idebus speed

[Brad Campbell]

Tim White wrote:
> Craig Ringer wrote:
> 
>> How are you determining that Linux is running the IDE bus at 33 MHz? If
>> you mean the boot message about "assuming 33MHz", My understanding is
>> that that is not relevant to the drive access.
>>
> So what does this message mean? I gathered it meant the bus was running 
> at 33Mhz (ATA33) instead of something higher, or that is what linux 
> thinks its running. So setting the idebus= does what?
> Tim

Think you will find it means the bus the ATA interface is sitting on is 33Mhz. (The PCI bus) if you 
run a funky PCI bus speed you need to tell the controller otherwise it's PIO timings get all out of 
spec and drives start munging data.

(mind the high tech description there!)

Regards,
Brad