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Subject: Re: Another port, is it possible?

Re: Another port, is it possible?

From: Vladimir Pantelic <pan_at_nt.tu-darmstadt.de>
Date: Mon, 13 Aug 2007 10:52:31 +0200

Ian Hawdon wrote:

> > Most of the players have an Actions ATJ2085 CPU chip
> > http://www.actions.com.cn/en/product.aspx?id=10 and can indeed
> play OGG
> > files (though their website doesn't say this)
>
> I'd say that this CPU/microcontroller is the most limiting factor to get
> Rockbox on these players: Rockbox is only built for and running on
> 32 bit cpu
> cores, so this Z80 8/16? bit will require some work to get Rockbox
> for. We
> once had it buildable for a 16bit CPU (calmrisc for one of the older
> Archos
> gmini models), but that particular port was abandoned and most of
> the long/int
> cleanups of those days are likely gone by now.

The data sheet says 8bit! There is a DSP that does the MP3 decoding and a DMA
controller, so most likely the z80 does little besides reading the FAT
filesystem and setting up the DMA to pipe data from Flash to the DSP.
Received on 2007-08-13


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