Rockbox.org home
release
dev builds
extras
themes manual
wiki
device status forums
mailing lists
IRC bugs
patches
dev guide



Rockbox mail archive

Subject: Re: Telechips-based players

Re: Telechips-based players

From: Andrew Green <andrew.e.green_at_gmail.com>
Date: Tue, 31 Jul 2007 18:32:06 -0230

Also there is a data sheet for the TCC767 linked on that forum post,
there are pinouts, register descriptions and a whole lot more in the
pdf.

Direct link:
http://files.myopera.com/ch%D0%B5t/files/1TCC76xRev0[1].05.rar

-Andrew

On 7/31/07, Andrew Green <andrew.e.green_at_gmail.com> wrote:
> I just found these image thanks to Google (not a clue on which DAP it
> is though),
> http://storage9.myopera.com/MoonGhost/files/1.JPG
> http://storage9.myopera.com/MoonGhost/files/2.JPG
>
> This is the forum post they came from, translation anyone?
> http://my.opera.com/kpex/forums/topic.dml?id=182384
>
> Hopefully it helps someone :)
>
> -Andrew
>
> On 7/31/07, Punit Agrawal <punit_at_cs.mcgill.ca> wrote:
> > On July 31, 2007 05:21:08 Dave Chapman wrote:
> > > Basil Dozhdalev wrote:
> > > > Hello,
> > > >
> > > > Had anyone ever try to develop Rockbox for Telechips-based
> > > > MP3-players?
> > >
> > > I wouldn't say I'm trying to develop Rockbox for the Telechips
> > > players, but I do have such a device (a small flash-based MP3/WMA
> > > player with DAB radio). This has a TCC773L.
> > >
> > I have the Cowon D2 (TCC7801) which I was trying to understand to check
> > the feasibility of a port. There are still a lot of unknowns but some
> > of what you say about the firmware matches up with my notes too. Except
> > that I didn't know about the jump. So one more piece of the puzzle in
> > place.
> >
> > > I've been collecting the firmware files for various telechips-based
> > > players, and it seems the firmware is unencrypted, but there are two
> > > 32-bit numbers in the headers (most likely a checksum and/or
> > > signature) which I haven't been able to figure out.
> > >
> > > So if your SDK can provide any clues to those, it would be helpful.
> > > Hopefully the 77x and 76x share a lot in common.
> > >
> > > As an example, the header for the firmware update for my Logik
> > > MP3/DAB player looks like this:
> > >
> > > 0000000: a0f3 9fe5 0601 ffff 5665 723a 3030 3731 ........Ver:0071
> > > 0000010: 05e8 fdea 0000 0000 be26 f687 18cd 0c00 .........&......
> > >
> > > My understanding so far is as follows:
> > >
> > > 0x00 - An ARM branch instruction (ldr pc, [pc, #xxx]) to the entry
> > > point on the firmware.
> > > 0x04 - 0601 in all firmwares I've looked at - version?
> > > 0x06 - 0xffff in all firmwares I've looked at
> > > 0x08 - "Ver:0071" string (in all firmwares)
> > > 0x10 - Unknown 32-bit number
> > > 0x14 - Zero in all firmwares I've looked at
> > > 0x18 - Unknown 32-bit number
> > > 0x1c - Length of firmware file in bytes
> > >
> > > Understanding those two unknown numbers and hence being able to
> > > generate firmware files accepted by the firmware upgrade feature of
> > > the original firmware would be a good start to any port.
> > >
> >
> > Yeah it would be a bit help if from the SDK, you can find the
> > tools/method used to create the firmware and pack the files etc. Having
> > one SDK might just make it possible for a lot of dependent devices to
> > be understood/ported.
> >
> > There are a few people on Cowon forums interested in a rockbox port for
> > the D2. If things start moving I have a feeling more people will join
> > in the efforts.
> >
> > Cheers!
> >
> > Punit
> > > Regards,
> > >
> > > Dave.
> >
> >
> >
>
Received on 2007-07-31


Page was last modified "Jan 10 2012" The Rockbox Crew
aaa