Paule Ecimovic wrote:
Hi, all
Is it possible to boot from MMC (assuming one sets up this booting
option by cloning the 770 on a suitably-large MMC and installing the
alternate boot loader and all the rest) to recover from a bricking
flash?
Boot from mmc can help you only when the problem is in rootfs partition
i.e. (a bit simplistic explanation) when booting the device blue
progressbar on the bottom starts.
I'm not sure what you mean by 'bricking flash' but any device reflash
with full firmware image removes modified initfs with boot menu and then
you cannot boot from mmc at all (without reflashing modified initfs
back). But this is not big problem because booting from mmc allows you
to stop fixing problems with your device by reflashing. Instead of
reflashing you can boot clean system and either mount broken system and
fix it (if you know how) or save data from it and clone your clean
system to mmc and start again.
Are there bricking scenarios from which it is not possible to
recover via booting from MMC?
Definitely yes but most things that can normally go wrong happen in
rootfs. Examples:
- you install bad/incompatible package
- you try apt-get upgrade
- you are trying to hack startup sequence
- device reboots in wrong moment and some system files get lost or
become corrupted (yes this really happens sometimes if you are unlucky)
Frantisek
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