Control: block 823020 by 823500
Control: tags 823500 confirmed
On 2016-05-05, Heinrich Schuchardt wrote:
> u-boot-imx fails to read file
> /dtbs/4.5.0-1-armmp/imx6q-wandboard-revb1.dtb
> from an ext4 partition though the file exists.
>
> lsext4 mmc 0 dtbs
> does not show the subdirectories in the directory dtbs.
Thanks for the report!
I've seen similar behavior on a wandboard and novena.
Was this partition created with debian-installer? In my experience
debugging this issue, an ext4 partition created with mkfs.ext4 from
stretch works fine. Reported the issue here, since I could only trigger
it with debian-installer:
https://bugs.debian.org/823020
> Booting from ext2 is possible with the same partition content. But of
> cause it would be preferable to have a journaling file system.
Marex was kind enough to help debug this issue; the problem may be the
flex_bg filesystem feature:
< Marex> vagrantc: I _think_ flexbg is what breaks the ext4 for
you
< Marex> vagrantc: u-boot does not support flex_bg (mkfs.ext4 -G
option)
< vagrantc> Marex: flex_bg, eh?
< Marex> vagrantc: yeah, flexible block group
< Marex> vagrantc: try without it
< Marex> vagrantc: flexible BG packs multiple block bitmaps at the
beginning of the block supergroup instead of having one bitmap per
block, it improves locality, but uboot doesn't support it
< Marex> vagrantc: and I think there is about zero performance
gain from having this enabled for DI
Although I *thought* I also saw a filesystem with flex_bg that worked
fine... so I'm not 100% sure at this point.
I haven't had time to follow up on the issue, but hope to be able to
further this coming week. Any further troubleshooting would be really
helpful!
live well,
vagrant
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