Hi Manoj, Matsumuro-san, On Mon, Jul 18 2011, Manoj Iyer wrote: > Right, without the patch I get.. > > [ 52.526665] mmc0: new SDHC card at address e624 > [ 52.571228] mmcblk0: mmc0:e624 SD16G 14.8 GiB > [ 52.591071] mmcblk0: retrying using single block read > [ 52.593105] mmcblk0: error -84 transferring data, sector 0, nr 8, > card status 0x900 > [ 52.593109] end_request: I/O error, dev mmcblk0, sector 0 > [ 52.594594] mmcblk0: error -84 transferring data, sector 1, nr 7, > card status 0x900 > [ 52.594604] end_request: I/O error, dev mmcblk0, sector 1 > [ 52.602893] quiet_error: 24 callbacks suppressed > [ 52.602902] Buffer I/O error on device mmcblk0, logical block 0 > [ 52.605349] ldm_validate_partition_table(): Disk read failed. > [ 52.605384] Dev mmcblk0: unable to read RDB block 0 > [ 52.607729] mmcblk0: unable to read partition table > u@u:~$ > > So, I cannot generate any comparison data with this SD card. I don't know if you remember this bug, but I have reports from two users who see "error -84"s on :e823 controllers even with this patch active on modern ThinkPads. Maybe 50MHz isn't low enough sometimes? Is it possible to lower the base clock further? I noticed that the frequency is encoded ine one of the PCI writes: + * 0x32 - 50Mhz new clock frequency So if I get access to one of these systems, I might try lowering that value (by half, say) and see what happens. But at the moment I haven't found someone who's willing to try kernel patches yet, and I don't have one of these systems myself. Thanks! - Chris. -- Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> One Laptop Per Child -- 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
