On 19:37 Sat 28 Jan , Douglas Gilbert wrote: > 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-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. > > > >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 can you test it on atmel_mci? at91_mci is deprecated and will be drop soon Best Regards, J. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
