Downloaded the firmware from the Cowon Site. Also upgraded to the same firmware on the Cowon (it did mess up in regards to the icons were missing in the "settings" menu). Never the less, using Rockbox utility, it asked for the firmware to be located before install. It ate 2 of the 3 firmware files from Cowon and didn't get the 3rd. It did tell me it installed on my D2. So, upon trying to start rockbox, the logo appears but says...." Rockbox bootloader.......file not found".
If someone could explain to me the process of.....
Build or download the bootloader binary (bootloader-cowond2.bin)
Patch this into your original Cowon firmware using mktccboot
../tools/mktccboot path_to_firmware/1/D2N.bin bootloader-cowond2.bin D2N-patched.bin
Build or download the main Rockbox build (rockbox.zip)
A pre-built "bleeding edge" zip can be found here.
Unzip rockbox.zip to the root of either an SD card or the internal memory
If an SD card is inserted at power on, Rockbox will boot from that card and use it as the primary drive for storing
If there is no SD card inserted, Rockbox will boot from the internal memory, and it will not be possible to save