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SubjectRe: IDE DMA problems on 2.4.0 with vt82c686a driver
Alan Cox wrote:

>> us who have via chipset motherboards, suggesting that it is limited
>> to that chipset, that chipset is ubiquitous, or via chipset
>> motherboard owners are generally the complaining type. no idea which
>> applies there, either.
>
>
> Or there are a lot of them. 90% of scsi bug reports I get are adaptec 29xx
> driver. Thats not because the adaptec 29xx is the most sucky driver 8)
>
> Firstly there are numerous reasons for CRC errors. At ATA100 even the track
> length and the capacitance of the connectors becomes an issue. It is quite
> possibly a driver issue. It could even be that specific combination of drives
> and ide controller is right on the edge of the spec limits and just slightly
> dipping over. It might be the odd power spike.
>
> Providing the code is working sanely the odd CRC error shouldnt be a
> problem and should be causing a command retry. The CRC checking used in ATA
> is very robust so unlike scsi parity errors which couldnt be ignored ATA
> ones on occassion are probably fine
>
> ATA100 is another testimony to the fact that pigs can be made to fly given
> sufficient thrust (to borrow an RFC)
>
> Alan

I acquired a VIA Mobo (ASUS CUV4X) for home and it is workin pretty damn
spiffy with Linux - Even better with 2.4.0 with regards to IDE!!!
Once a month I boot WinDOS to play a game I can't play in Linux, THEN
my troubles begin!!!
parport_pc: Via 686A parallel port: io=0x378, irq=7, dma=3
VP_IDE: VIA vt82c686a IDE UDMA66 controller on pci0:4.1
etc... etc... etc...
yadda yadda yadda ....

Alan,
My father repaired F-4 Phantoms in Vietnam. He said the F-4 Phantom was
proof that if you put enough power behind a brick, it would fly!!!
Your comment remonded me of that - just had to share :-)

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