SDIO multiplexing

[Andy Green]

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Somebody in the thread at some point said:

| just for the record: my main reason to not like the glamo is that it
| severely
| limits I/O passthrough to the microSD, hence effectively forbidding SD
| and GPU
| access at the same time.

Well it's not that bad at all.  Glamo SD works by setting up the
transaction to the card, and then Linux goes and does something else
until it gets an interrupt from the Glamo.  Only then it pulls the bulk
data out of Glamo RAM.  So during the interrupt the CPU pulls SD data;
the rest of the time, including while it waits for completion, it can do
the graphics side.

- -Andy
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