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Rockbox mail archiveSubject: Re: Another port, is it possible?Re: Another port, is it possible?
From: Bluechip <csbluechip_at_gmail.com>
Date: Mon, 13 Aug 2007 20:07:00 +0100 >> > 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. It also handles keyboard and screen, loads the dac into the dsp, tells the radio what to do, and a few other trivial tasks. Received on 2007-08-13 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |