Re: CompactFlash and HD unhappy together on the same IDE channel

[Matt Sealey <matt@genesi-usa.com>]

Alan Cox wrote:
>> I've acquired a new CF card that is capable of UDMA2, and with the same 
>> connectors, wiring and adaptor (i.e. I popped out the MWDMA card and 
>> inserted the UDMA one), I can now boot and read data on both devices 
>> without error at reasonable speeds.
> 
> Fascinating. Does point more to a driver funny you are right. At the
> moment I'm at a loss to guess what

Why would it be a driver quirk just because it now works when it didn't
before?

There are plenty of completely WEIRD people out there who install SCSI
systems in a Y configuration with a controller in the middle and both
ends terminated (or one end not or one end with a real terminator and
the other using drive termination) which is totally out of spec and
so on but *works* just fine by some random chance of chipset, drives and
cable length..

Doesn't UDMA checksum transfers, where MWDMA doesn't - or some drive to
controller intervention which would silently retry where MWDMA would
just pop it's guts all over your system?

-- 
Matt Sealey <matt@genesi-usa.com>
Genesi, Manager, Developer Relations