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Subject: RE: Survey for Rockbox in Flash, please participate
From: Lee Marlow (lmarlow_at_yahoo.com)
Date: 2003-05-19


JBR 20
M=BF D=D6

-----Original Message-----
From: owner-rockbox_at_cool.haxx.se [mailto:owner-rockbox_at_cool.haxx.se] On
Behalf Of idc-dragon_at_gmx.de
Sent: Monday, May 19, 2003 3:55 AM
To: rockbox_at_cool.haxx.se
Subject: Survey for Rockbox in Flash, please participate

Hello,

we're starting to work on the possibility to bring Rockbox into the Flash
ROM of the jukebox. Imagine booting in maybe 3 seconds!

Don't tell me it's dangerous. The box has a boot ROM, it seems to contain a
little monitor communicating over RS232. We may be able to use this to
inject code to program the box even if the flash is completely garbled. All
this is to be analyzed yet.

There are units with flash chips that could be programmed in-system, while
others can't (like mine, grr!).
I made some test code to find out, by reading the flash IDs. Since the
20030518 daily build this code is in. Please test yours, in the menu go to
"Debug (Keep Out!)" -> "View HW info". If the Flash entry lists hex bytes
for manufacturer and device, you're lucky. If it gives only question marks,
it failed to bring the flash into command mode, meaning either the chip
would need a 12.5V programming voltage (like my SST37VF020) or you have some
exotic flash my code is not prepared for.

The lucky guys are most likely to find "Flash: M=BF D=D6", which means
SST39VF020. I would be very interested in other values.

If you did the test, please post here or email me regardless of the result,
I'd like to get some meaningful statistics.

Thanks,
Jörg

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