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Subject: Re: Reflashing JBRv2
From: BlueChip (cs_bluechip_at_webtribe.net)
Date: 2004-05-30


You are safe to try daily builds in flash
...Your Archos firmware is THE backup, *not* A backup.

In essence, the first flash, backs up the Archos f/w to one half of ROM
space; and inserts Rockbox in the other.
Further updates simply ovewrite the Rockbox section.
This has been done to ensure that you only ever risk your chip the first time.

I'm not sure if the original Archos f/w is compressed and prefixed with a
decompressor.
But the Rockbox f/w *is* compressed with ucl.

There is also a little program which _must_ be stored in an untouched
section of ROM which detects whether F1 is being pressed at the moment of
startup.
My guess would be
         IF (BUTTON!=F1) GOTO ROCKBOX;
is appended to the front of the Archos f/w.

Happy developing :)

BC

>I have firmware flashed to RockBox 2.2 and everything works wonderfully. the
>speed of booting and shut down is well worth the minimal effort. My question
>is if I want to reflash with one of the daily builds will I lose the ability
>to do the on+F1 to get into the Archos firmware. My sense of logic points me
>towards the following; when I originally flashed the firmware it took the
>Archos firmware and made it the back up firmware. If I reflash with a new
>RockBox firmware, will it put my originally flashed RockBox firmware as the
>backup firmware or will it keep the Archos firmware as the backup? I want to
>try some of the daily builds but I don't want to lose the security blanket
>of the Archos firmware as a backup.
>
>Thanks for any help with this. sometimes I just get paranoid and don't do
>anything to move forward. I very much appreciate all the tips and info I've
>gotten here since I got my JBRv2. My daughter has an Ipod and it's really
>elegant but I really like my JBR with RockBox installed.
>
>Dan

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