Fwd: Freerunner // SD Card Patches in stable

Andy Green andy at openmoko.com
Thu Jul 17 11:34:39 CEST 2008

Hash: SHA1

Somebody in the thread at some point said:

I just moved these patches to the stable kernel branch so in the next
day they will become available in normal distribution kernels.  I only
tested it with Sandisk 512MB we ship, it's possible it breaks some other
cards, so let us know if it is seen and we'll try to figure it out.

| it would be great if someone validates that in general SD performance is
| not hurt with such patches?

It won't change SD performance.  We just stop running the clock when we
have nothing to say to the SD Card.  SD Card has its own private clock
internally it uses for its own needs.  As soon as we did need to talk,
we will be running the clock exactly as before.

In fact I thought we already did this at the Glamo, but the ambiguous
documentation fo that bit actually seemed to mean it stopped clock to
internal logic in Glamo when idle, not the external clock.

|> If so, that's excellent, times dropped across the board.  :)

Well it won't do any better than removing the card, I think it is just
variation in the results.  But the results are very encouraging.

- -Andy
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