michael

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About michael

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  1. Igor, thanks for the quick change to the board configuration file. Setting an OFFSET seems to be the best solution - at least for new installations. Unfortunately, OFFSET=12 is too low to solve the issue. The data is written to block #98304, which means that OFFSET has to be greater than 98304 / 2048. So OFFSET must be at least 49. I also reported the issue to the Odroid people: http://forum.odroid.com/viewtopic.php?f=141&t=26097&sid=bdee0ffe9e7193c430136dd2cc2450a3 The promised to have a look at it. I will let you know, if they come up with a fix to the kernel source.
  2. I created a new image for my Odroid C2 with the most current version of Armbian 5.26. Configuration was pretty much standard, except BOOTSIZE=0 and ROOTFS_TYPE=ext4. The image works fine, if dumped to a sdcard. When dumping it to an emmc card, the system boots up, but 'find / > /dev/null' leads to a filesystem error: [ 52.799920] EXT4-fs error (device mmcblk0p1): htree_dirblock_to_tree:913: inode #41001: block 12032: comm find: bad entry in directory: rec_len % 4 != 0 - offset=0(0), inode=8213, rec_len=4097, name_len=0 [ 52.812862] EXT4-fs (mmcblk0p1): Remounting filesystem read-only Behavior is deterministic - I tried with two different boards and two different emmc cards. I also checked, that the filesystem is initially ok on the emmc. I tracked the problem down to the Amlogic mmc driver in linux kernel 3.14.y. During kernel boot, the function aml_sd_emmc_execute_tuning in drivers/amlogic/mmc/aml_sd_emmc.c is invoked. pdata->need_cali == 1 and aml_sd_emmc_execute_tuning_index is called. At the end, this function writes to the emmc: mmc_write_internal(mmc->card, record_blk, 1, write_buf). The first two bytes of the written data are 0x2015, 0x1001 - which perfectly corresponds to the inode and rec_len from the error message above. The position where the data is written at is calculated in emmc_partitions.c (function get_reserve_partition_off) and depends on several constants. The position evaluates to block #98304, which is somewhere in the root partition of the disk. Since in my image, this block is used by a directory inode, the filesystem gets corrupted. On an image with a 64MB boot partition and an ext4 root partition, the write operation goes to the boot partition. It does not seem to have a negative impact on the consistency of the filesystem - at least not in my case. I could imagine different solutions of the problem: (1) set OFFSET=64 -> write operation will go to the unused space before boot / root partition (2) change constants in linux kernel -> write operation will go to a different block on emmc (i cannot guess potential side effects of this) (3) change partition layout on emmc by changing calculation in debootstrap-ng.sh Best regards, Michael