1) "OS of modem" (which is not the OS of processor of phone)
is loaded from flash into some modem RAM, right?
2) is modem flash (which is not the modem ROM, and is not part of the normal
flash)
readable external to the processor?
3) is clear ROM, used in modem, available on market for personal buying?
(if so, with what price?)
> As I understand it, the modem CPU has a small internal boot
> ROM.
> It boots from this, and verifies the first stage bootloader
> on the external flash (which is not part of the normal flash).
> Only if the http://en.wikipedia.org/wiki/Cryptographic_signature
> matches is the bootloader executed.
>
> This then runs the modem 'main' OS - which is not linux.
> The modem then boots, and communicates with the main
> processor running linux for commands.
>
> (dial, login to network, ...)
>
> The signature is stored in the ROM of the modem CPU.
>
> It is very difficult to extract the key from the ROM,
> as it is not meant to be readable external to the processor.
_______________________________________________
maemo-developers mailing list
maemo-developers@maemo.org
https://lists.maemo.org/mailman/listinfo/maemo-developers
