betrik now also has the FM radio working and the ADC (used to read the remaining battery power and on the M6SP also for the buttons).
One of the biggest challenges now will be the flash management code (the FTL). The iphone uses the same one as the meizu firmware and we could reuse code for it from
Main Page - iPhone Linux, but I don't know how much work it would be. Another option is to use some other implementation, but that would mean that rockbox and the official firmware can not be installed at the same time.
pmp: rockbox doesn't support SRS WOW. We have some DSP effects like "crossfeed" which improves listening over headphones and a good parametric equalizer.
All audio is currently resampled to 44.1KHz, so even if you play something with a samplerate of 96KHz it will not sound any better. That might change some day.