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Subject: RE: Telechips-based players

RE: Telechips-based players

From: Basil Dozhdalev <bdozhdalev_at_hotmail.com>
Date: Wed, 1 Aug 2007 08:22:04 +0400

This forum is about Kingston KPEX (seems to be not listed on their site anymore), an OEM of Cenix's GMP-M6
http://www.cenix.co.kr/cenix/?doc=product/mp3_mp_m6.php
 

> Date: Tue, 31 Jul 2007 18:27:31 -0230> From: andrew.e.green@gmail.com> To: rockbox-dev@cool.haxx.se> Subject: Re: Telechips-based players> > 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@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.> >> >> >
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Received on 2007-08-01


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