Messages in this thread |  | | | Date | Fri, 20 Feb 2009 12:43:43 -0500 | | From | Andres Salomon <> | | Subject | OLPC XO-1 sdhci regression |
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Hi Pierre,
With the current Linus git tree, the sdhci driver fails to find the partition table on cards during bootup on OLPC XO-1 machines. This makes booting off of SD impossible. The errors go something like this:
mmcblk0: mmc0: Timeout waiting for hardware interrupt. mmcblk0: error -110 sending stop command end_request: I/O error, dev mmcblk0, sector 0 Buffer I/O error on device mmcblk0, logical block 0 [repeat a bunch of times] unable to read partition table
No oopses or anything, the SD controller just fails to read the partition table off the card.
I bisected a bit, and that led me to this commit:
commit e809517f6fa5803a5a1cd56026f0e2190fc13d5c Author: Pierre Ossman <drzeus@drzeus.cx> Date: Fri Jul 25 01:09:08 2008 +0200
sdhci: let the controller wait for busy state to end
The sdhci controllers can interrupt us when the busy state from the card has ended, saving CPU cycles and power.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Reverting that commit allows the driver to read the partition table.
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