Rockbox Ports are now being developed for various digital audio players!
When I did research for my hobby project, imx233 from Freescale was the most cost effective solution (pamaury mentioned it already) BUT I considered only chips available is single pieces in Europe.I am not contesting provided power consumption numbers (as I don't have proper documentatin) BUT SoC consumes usually only tiny fraction of whole system power draw. At what conditions provided consumption was measured?
Low power consumption sure is the strong point of the ATJ2127. Is that only possible because it has rather limited possibilities?
I can't say definitely rockbox will do much better but eCOS based original firmware for atj213x is, lets put it mildly, suboptimal. At least the versions I disassembled so far.
I would be extremely careful with manufacturer figures. For example the Fuze+ with Freescale OS lasts 25h on a 550mAh battery but Rockbox lasts around 45h. And most of the savings don't come from the CPU, since with proper frequency management you can decrease it a lot, but rather properly shutting down or suspending LCD, touchpad, mmc/sd.
I am working on Iriver e100/150/200/300 series (e150 is my playground). If you have documentation for atj213x (or more precisely the one I don't have) that would be helpful.
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