[yocto] System recovery

[Enrico Bonomi]

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 <mtownsend1973 at gmail.com>:

> On Wed, May 9, 2018 at 11:21 AM, Enrico Bonomi
> <enrico.bonomi92 at 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 <mtownsend1973 at 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.bonomi92 at 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 at 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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