On 11-07-28 07:48 PM, Chris Ball wrote:
Hi, thanks for the bug report. Adding linux-mmc@ and some atmel driver
folks to CC.
On Thu, Jul 28 2011, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote:
Prior to 3.0.0 the FoxG20 board (Atmel AT91SAM9G20) could boot and use
both micro SD and SDHC card to contain its root file system. With the
advent of the 3.0.0 kernel the micro SDHC card is unable to mount the
root file system.
Comparing the relevant part of dmesg for 2.6.38.6 (and it worked on
2.6.39):
...
Waiting for root device /dev/mmcblk0p2...
mmc0: host does not support reading read-only switch. assuming write-enable.
at91_mci at91_mci: Timeout waiting end of packet
mmc0: new SDHC card at address 1234
mmcblk0: mmc0:1234 SA04G 3.67 GiB
mmcblk0: p1 p2 p3
...
to the same dmesg section for 3.0.0 :
...
Waiting for root device /dev/mmcblk0p2...
mmc0: error -110 whilst initialising SD card
at91_mci at91_mci: Timeout waiting end of packet
mmc0: error -110 whilst initialising SD card
[no further progress]
Non "HC" SD cards work as expected in 3.0.0
If no-one on the CC list has any ideas, would you be interested in
trying to bisect this change?
Another possibility would be adding printks before all of the -ETIMEDOUT
lines in core/* and host/at*, in order to see which one you're hitting
(and therefore which operation is causing the initialization to fail).
But a full bisection would be more conclusive.
Sorry, I keep away from git. But the smoking gun is
drivers/mmc/core/sd.c that underwent major changes
to support SDXC between 2.6.39 and 3.0.0 .
Luckily I can revert core/sd.c to the state it was in
in lk 2.6.38.6 and it compiles in 3.0.0 . With that kernel
my Fox G20 can read its root fs from a SDHC card.
BTW With lk 2.6.39 the Fox G20 booted okay from a SDHC
card but that kernel had other (UDP broadcast) problems.
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