Hi Martin, I know that i can create multiple images types, but i don't want an sdcard bootable image. On my first try, the image on sdcard was ubi type because i want to obtain i kind of recovery partition directly on the sdcard. Do you suggest to put the recovery partition directly on the raw NAND? in that case how could i create a compressed image (because i don't have enough space on my device to keep 2 images)?
thanks Enrico 2018-05-09 12:37 GMT+02:00 Martin Townsend <mtownsend1...@gmail.com>: > On Wed, May 9, 2018 at 11:21 AM, Enrico Bonomi > <enrico.bonom...@gmail.com> wrote: > > Hi Martin, > > > > I'm newbie in yocto, but i used IMAGE_FSTYPES ="sdcard" to boot the > system > > from SD card. What i want to obtain is to replace the broken file system > > that is located on the NAND with another one that works. A kind of > recovery > > partition. is it possible from SD or should i create a recovery partition > > over the NAND? > > > > thanks > > > > Enrico > > > > 2018-05-09 11:25 GMT+02:00 Martin Townsend <mtownsend1...@gmail.com>: > >> > >> Hi Enrico, > >> > >> UBI is only designed to work on raw NAND using the MTD subsystem. MMC > >> will be a standard block device as the SD card will have Flash > >> Translation layer. See the excellent MTD website for more info > >> http://www.linux-mtd.infradead.org/doc/ubi.html > >> > >> In Yocto I believe you can use "sdcard" in the IMAGE_FSTYPES for a > >> flashable image for SD cards that can be used with U-Boot. > >> > >> -Martin. > >> > >> > >> On Wed, May 9, 2018 at 9:31 AM, Enrico Bonomi < > enrico.bonom...@gmail.com> > >> wrote: > >> > Hi, > >> > > >> > I work with Yocto Poky 1.7.3 on an imx6 dual lite SOM. I recently came > >> > across a problem with a preexisting system. Infact in a couple of > cases, > >> > after about one year of work with no problems, file system results > >> > corrupted > >> > and the machine can't work. So i decide to implement a recovery system > >> > that > >> > can intervene in theese cases. An sd card is mounted on my board, so i > >> > think > >> > that i can use it to act this process. Using gparted i create a > >> > partition on > >> > sd card that can store my recovery file system. > >> > This partition starts at block 1581056 (so 0x00182000), every block > has > >> > a > >> > size of 512 bytes and the file system size is 370262016 bytes (so > >> > 0x1611c000) that are 723168 blocks (so 0x000b08e0). > >> > In the u-boot i do the following instructions: > >> > > >> > nand erase.part rootfs > >> > ubi part rootfs > >> > ubi create rootfs > >> > mmc dev 0 > >> > mmc read 12000000 0x00182000 0x000b08e0 > >> > ubi write 12000000 rootfs 0x1611c000 > >> > ubifsmount ubi0:rootfs > >> > > >> > and this instruction results in the following errors: > >> > > >> > UBIFS error (pid 0): ubifs_read_node: bad node type (0 but expected 6) > >> > UBIFS error (pid 0): ubifs_read_node: bad node at LEB 0:0 > >> > UBIFS error (pid 0): ubifs_mount: Error reading superblock on volume > >> > 'ubi0:rootfs' errno=-22! > >> > > >> > ubifsmount - mount UBIFS volume > >> > > >> > Usage: > >> > ubifsmount <volume-name> > >> > - mount 'volume-name' volume > >> > > >> > the strange thing is that when i first program all new devices i use > the > >> > following instruction: > >> > > >> > tftpboot prall > >> > > >> > and prall is the compiled of a txt file which, when programming file > >> > system > >> > use the same instructions, obviously except for > >> > > >> > tftp 12000000 rootfs.ubifs > >> > > >> > instead of my mmc instructions, and > >> > > >> > ubi write 12000000 rootfs ${filesize} > >> > > >> > but from what i understand the "filesize" variable is set from the > tftp > >> > instruction > >> > > >> > Where do i fail? > >> > > >> > Thanks > >> > > >> > Enrico > >> > > >> > -- > >> > _______________________________________________ > >> > yocto mailing list > >> > yocto@yoctoproject.org > >> > https://lists.yoctoproject.org/listinfo/yocto > >> > > > > > > > You forgot to reply to all so added the Yocto mailing list back in again. > > You can create multiple images by specifying ubi and sdcard in > IMAGE_FSTYPES and then flash ubi to the raw NAND and then the sdcard > image to the SD then write the logic to perform the switch. > > -Martin. >
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