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Subject: Re: Need help with UART boot
From: Andreas Stemmer (groovingandi_at_gmx.de)
Date: 2004-06-03


Hi [IDC]Dragon,

thank you for your quick answer!

[IDC]Dragon wrote:
> > I tried to upgrade my non-flashable jukebox (recorder 20) with a new flash
> > chip today,
>
> Whoo, what a brave guy! Where did you get a chip?

http://www.electricstuff.co.uk/forsale.html

> > b) 1. jukebox off, UART boot mod disabled (original state)
> > 2. uart_boot -p COM1 -r -a -b
> > 3. power-on jukebox
> > Result: uart_boot displays some menu (like [IDC]Dragon described it in
> > his early posts about the UART boot mod) and complains that it can't find
> > minimon_v2.bin
>
> I could give you the _v2 file, but it's pointless. I was on a wrong path
> when I did the -a option, thought that archos boot menu is in ROM, but it's
> in the flash, prone to be overwritten anyway.

Ok, then it was right that I didn't use the -a option for flashing.

> Don't forget to patch in your h/w mask, 2 bytes at offset 0xFC and 0xFD,
> else you may get some funny behaviour.

Ah, good to know. I thought your uart_boot program would handle that.

> > and it looked as if it was successful, but it wasn't. If I dump the
> > contents of the flash, I get something completely different.
>
> Reading with uart_boot? This should give you the true content. Different
> than what? The flashed firmware_rec.bin?

Yes,
   uart_boot -p COM1 -r -f firmware_rec.bin
followed by
   uart_boot -p COM1 -r -d firmware_dump.bin
results in a firmware_dump.bin file which is completely different from
firmware_rec.bin

> You need to release the LCD lines for a normal start.

Yes, I did that. Actually I soldered in a small switch to select between
LCD lines low/released. If I start with LCD lines released, I get three
short blinks of the red light and then nothing happens.

Andreas

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