[Buildroot] [RFC PATCH 1/2] support/scripts/genimage.sh: support creating a bmap image

[Gero Schwäricke]

Hi Dario,

I tried your patch, but it didn't work for me. bmaptool failed with an
error. The issue was that my home directory is encrypted using ecryptfs.
This does not implement all ioctl options that are needed for bmaptool
to read the block allocation of the image file. There also seem to be
issues with ZFS, so I would recommend to not enable this by default for
defconfigs.

A workaround for the issue described above would be to sparse copy the
image to a mktemp file and run bmaptool on that. However that will only
work if /tmp uses tmpfs (iiuc). And will potentially eat a lot of memory
for this step.

I generally like the approach of bmaptool and think including this in
buildroot seems like a good idea. Maybe the documentation should also
include a section on that in "14.1 Boot the generated images". Currently
it only covers NFS boot and Live CD. Different optimizations for sdcard
flashing seem to be missing.

Best,
Gero

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