Dear all, I have an issue with u-boot 2010.06 for mpc8536ds and SD card. (actually not sure if it is specific for 2010.06).
If I try to access the SD card (a SanDisk 2GB cl2 card), from within u-boot I often get errors. The odd thing is that the errors are not always at the same place. Below is a log. As you can see from the log reading the first blocks works nicely, but at arund block 64 things become fuzzy. The last few tests show that sometimes it does manage to read a block whereas the next try it might not read that block (or the other way around) => mmc read 0 100000 0 100 MMC read: dev # 0, block # 0, count 256 ... block read failed: -18 64 blocks read: ERROR => mmc read 0 100000 0 5 MMC read: dev # 0, block # 0, count 5 ... 5 blocks read: OK => mmc read 0 100000 0 10 MMC read: dev # 0, block # 0, count 16 ... 16 blocks read: OK => mmc read 0 100000 0 100 MMC read: dev # 0, block # 0, count 256 ... block read failed: -18 65 blocks read: ERROR => mmc read 0 100000 63 10 MMC read: dev # 0, block # 99, count 16 ... block read failed: -18 1 blocks read: ERROR => mmc read 0 100000 63 10 MMC read: dev # 0, block # 99, count 16 ... block read failed: -18 4 blocks read: ERROR => mmc read 0 100000 63 10 MMC read: dev # 0, block # 99, count 16 ... block read failed: -18 2 blocks read: ERROR => mmc read 0 100000 63 10 MMC read: dev # 0, block # 99, count 16 ... block read failed: -18 5 blocks read: ERROR => mmc read 0 100000 63 10 MMC read: dev # 0, block # 99, count 16 ... block read failed: -18 3 blocks read: ERROR The strange thing is that the card under linux works like a charm: r...@unknown:~# dd if=/dev/mmcblk0 of=/dev/null count=200 200+0 records in 200+0 records out 102400 bytes (102 kB) copied, 0.0231558 s, 4.4 MB/s r...@unknown:~# dd if=/dev/mmcblk0 of=/dev/null count=200 200+0 records in 200+0 records out 102400 bytes (102 kB) copied, 0.0234544 s, 4.4 MB/s r...@unknown:~# dd if=/dev/mmcblk0 of=/dev/null count=200 200+0 records in 200+0 records out 102400 bytes (102 kB) copied, 0.0233649 s, 4.4 MB/s r...@unknown:~# dd if=/dev/mmcblk0 of=/dev/null count=200 200+0 records in 200+0 records out 102400 bytes (102 kB) copied, 0.0232536 s, 4.4 MB/s r...@unknown:~# dd if=/dev/mmcblk0 of=/dev/null count=1000 1000+0 records in 1000+0 records out 512000 bytes (512 kB) copied, 0.0713617 s, 7.2 MB/s r...@unknown:~# dd if=/dev/mmcblk0 of=/dev/null bs=1M 1938+1 records in 1938+1 records out 2032664576 bytes (2.0 GB) copied, 184.323 s, 11.0 MB/s This is from a fresh boot. It might be the 2nd and further tests get data from the buffer cache but initially the data is read from the card Anyone a suggestion? I really would like to be able to load my kernel off the card. Or is there a different type/brand of card that is better suited? Best regards, Frans.
_______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
