1. Problem Description --------------------------------- 1.1 Setup I have a SheevaPlug running Debian. System is installed on nand Flash. Installation process is following: - First I boot up with USB stick and Debian installer images on it - Get Debian Installed and running on USB stick - Run the commands below to get it moved to Flash:
ubiformat /dev/mtd2 -s 512 ubiattach /dev/ubi_ctrl -m 2 ubimkvol /dev/ubi0 -N rootfs -m mount -t ubifs ubi0:rootfs /mnt mkdir /tmp/rootfs mount -o bind / /tmp/rootfs/ cp -a /tmp/rootfs/* /mnt/ cp -a /boot /mnt/ - Make required changes in u-boot configuration and system starts to work. 1.2 Failure Everything is all right until I get power surge After that system fails with: Marvell>> boot UBI: mtd1 is detached from ubi0 Creating 1 MTD partitions on "nand0": 0x000000500000-0x000020000000 : "mtd=2" UBI: attaching mtd1 to ubi0 UBI: physical eraseblock size: 131072 bytes (128 KiB) UBI: logical eraseblock size: 129024 bytes UBI: smallest flash I/O unit: 2048 UBI: sub-page size: 512 UBI: VID header offset: 512 (aligned 512) UBI: data offset: 2048 UBI: attached mtd1 to ubi0 UBI: MTD device name: "mtd=2" UBI: MTD device size: 507 MiB UBI: number of good PEBs: 4055 UBI: number of bad PEBs: 1 UBI: max. allowed volumes: 128 UBI: wear-leveling threshold: 4096 UBI: number of internal volumes: 1 UBI: number of user volumes: 1 UBI: available PEBs: 0 UBI: total number of reserved PEBs: 4055 UBI: number of PEBs reserved for bad PEB handling: 40 UBI: max/mean erase counter: 1/0 UBIFS: recovery needed Error reading superblock on volume 'ubi:rootfs'! UBIFS not mounted, use ubifs mount to mount volume first! UBIFS not mounted, use ubifs mount to mount volume first! Wrong Image Format for bootm command ERROR: can't get kernel image! 1.3 Recovery If I run again from the USB stick and mount Flash partition Debian kernel manage to recover it: root@debian:~# mount -t ubifs ubi0:rootfs /mnt [ 306.205029] UBIFS: recovery needed [ 309.341987] UBIFS: recovery completed [ 309.345705] UBIFS: mounted UBI device 0, volume 0, name "rootfs" [ 309.351738] UBIFS: file system size: 515192832 bytes (503118 KiB, 491 MiB, 3993 LEBs) [ 309.359789] UBIFS: journal size: 25804800 bytes (25200 KiB, 24 MiB, 200 LEBs) [ 309.367495] UBIFS: media format: w4/r0 (latest is w4/r0) [ 309.373352] UBIFS: default compressor: lzo [ 309.377479] UBIFS: reserved for root: 4952683 bytes (4836 KiB) 2. Fixing ====== 2.1. My first direction is to update u-boot with latest patches. There is a chance it will let u-boot be able to mount broken partition. There is another thread here where I work on it "Latest SheevaPlug u-boot" 2.2. My second plan is to separate rootfs partition into two partitions. One would be read only and will keep all static data. The second partition will be RW and will contain changing data. Actually all I need is to 1. Arrange let's say /flash_rw partiotion 2. Make rootfs partition read only 3. Fix u-boot settings And here I'm not sure how to do all this. 2.3. u-boot I assume I should start with changing partitioning in u-boot: Currently I have mtdparts mtdparts=orion_nand:0xa0000@0x0(u-boot),0x400000@0x100000(uImage),0x1fb00000@0x500000(rootfs) How to split rootfs into two partitions? ============ Do you think such approach will help to survive power surges? What should be next steps? Thanks a lot. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/caf9kqnhbct+wfserwgvnkxapca5u-7dzdwfhamhd8pppq-m...@mail.gmail.com
