Rockbox mail archive
Subject: Re: Survey: who has a non-V1 boot ROM?
From: jmp (jdon_at_wanadoo.fr)
On Mon, 22 Sep 2003 11:40:47 +0200 (MEST), [IDC]Dragon wrote:
> Hello Rockboxers,
> since a while the hardware info screen (Debug->HW Info) computes a CRC
> across the boot ROM, to identify it. This ROM is built into the CPU and is really
> permanent, not to be confused with Flash.
> The majority has what I called V1 for version 1. This bootcode is identical
> to Players, Recorders, FMs. I exploit its features for my Flash bootloader
> and the UART boot mod. So if you have flashed already, you for shure have V1
> and can stop reading here.
> However, some boxes are different, have what I call a V2 boot ROM which
> expects a different Flash layout. This is the reason why I have no Flash support
> for those yet.
> So, even if you don't like flashing, can you please check if your ROM CRC
> value is different from 0x222F, the V1 value? In that case please post here,
> tell us which model you have. V2 users will find 0x8C1E. I'd like to find out
> how many there are, if it's worth spending effort on it. If you discover a
> value different than these two, I'd say "oh no" but be highly interested and
> want a dump from you.
> My current status on V2:
> - I have looked into the bootrom, found it has the Archos flash monitor
> already in there, versus the V1 boxes have in flash. See my old post for details:
> - There is no UART boot mode like the one I exploited for my mod, but
> something better (requires no further mod than serial):
> - I analyzed how this monitor works, know how to operate it. It indeed has
> the capability to reflash within certain areas, but can also be used to
> download and start arbitrary code over the serial link.
> - I have modified my UART boot mode tool to work with the Archos monitor
> instead, use it to transfer and start my "minimon". With V2, this again allows
> to fully reprogram from scratch, even if completely messed up, it is the
> safety net. I like to have that first, before any flashing experiments.
> The follow up question would be: Is there somebody with a V2 bootrom who
> has/can do the serial mod to verify this? We can start easy, first blink the
> LED, more as you like.
Page was last modified "Jan 10 2012" The Rockbox Crew