On 11-10-24 09:54 PM, Douglas Gilbert wrote:
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-dae...@bugzilla.kernel.org 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.
Still broken in lk 3.1.0, same errors in dmesg.
Still broken in lk 3.2.0, same errors in dmesg.
The solution (hack) up to lk 3.1.0 has been to take
linux-2.6.38/drivers/mmc/core/sd.c file and overwrite
the defective sd.c . That worked in lk 3.0.* and 3.1.* .
In lk 3.2.0 the old sd.c no longer compiles but
by adding "#include <linux/stat.h>" is does and thereafter
that SDHC card can be read again.
My test system is a FoxG20 card which is based on the
AT91SAM9G20 SOC. The card's BIOS can read the 4 GB
microSD (HC) card in all cases; the problem is with
SDHC cards and all drivers/mmc/core/sd.c from and
including lk 3.0.0
Doug Gilbert
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