Thanks Frantisek and all for your responses. I am most concerned about the
bricking scenarios resulting from flashing a 770 to set it into R&D mode,
where the 770 sometimes bricks after rebooting. Are there bricking scenarios
in this reboot situation which involve corruption beyond MMC reboot? Any
chance of hard-disk based ITOS for Nokia Internet Tablet's. I know this
would require more power and possibly a larger footprint and many
architectural modifications which might defeat the (nascent niche) purpose,
but it would allow rebooting in various modes and under various privledge
schemes without the threat of irreparable bricking.
Cheers,
Paule
----- Original Message -----
From: "Frantisek Dufka" <[EMAIL PROTECTED]>
To: "Paule Ecimovic" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Tuesday, February 13, 2007 3:07 PM
Subject: Re: [maemo-users] Booting from MMC as a de-bricking method
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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