[meta-freescale] Merge of 3.14.52 GA into master and jethro

[Matt Madison]

On Sat, Feb 27, 2016 at 4:12 AM, Otavio Salvador
<otavio.salvador at ossystems.com.br> wrote:
> On Sat, Feb 27, 2016 at 9:03 AM, Fabio Estevam <festevam at gmail.com> wrote:
[...]
>> However in the second boot it failed to found the rootfs, which seems
>> to match what Matt reported:
[...]
>> All subsequent boots failed as well.
>
> I think I know what is going on; instead of plugging out the power
> cable, issue a reboot in the first time. It will work afterwards it
> seems.

The problem I was reporting was U-Boot being unable to read the ext4
rootfs properly (using ext4ls, for instance).  Linux had no problem
with it.

And it looks like the problem is that U-Boot's ext4 filesystem support
doesn't understand some of the more recent features that have been
added.  In particular, I found that by adding

EXTRA_IMAGECMD_append_ext4 = " -O ^flex_bg"

to my image recipe, to disable that particular ext4 feature, clears up
the problem I was seeing on my Wandboard, at least with jethro builds.
That seems to be enough, at least - I couldn't really tell from
reading the U-Boot ext4 code which features it really does support.

This doesn't affect the default SDcard images that much, since the
kernel and device tree get put into a FAT partition anyway, so U-Boot
doesn't have to read the rootfs partition.  It was more of a problem
for my custom board, because there I don't use the default layout, and
instead bundle the kernel and device tree with the rootfs.

With builds off master, the newer e2fsprogs from OE-Core master also
defaults to enabling the metadata_csum feature, and mke2fs issues a
warning about moving to a 3.18 or later kernel during the filesystem
creation (when run directly on my board with the 3.14-based kernel),
due to instability of that feature in older kernels.  So we could see
some other issues crop up going forward, too.

Thanks,
-Matt


>
> --
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://code.ossystems.com.br
> Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750
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