As bad as it is to reply to one's own message.. I've fixed the problem. Seems
I was doing something wrong in the send/receive routines - I've merged them
into a single routine that sends and receives at the same time. I've also
added a 10uS delay before and after pulsing the clock line high. This seems
to have been the encouragement the MMC needed - it's now sending out 0x01
responses to the "Switch to SPI mode" command.

Thanks.
--
Phil.                              | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem@dsl.pipex.com              | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.dsl.pipex.com/  | 48xCD, ARCINv6c IDE, SCSI
... In case of fire, yell FIRE!

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