Rockbox Ports are now being developed for various digital audio players!
The TMS320DM320 is a dual core ARM9/DSP chip. The ARM part of it can be targeted by an ARM compiler. The Cowon A2 also uses the TMS320DM320 chipset and has a GPL Linux firmware. You can download the source code from Cowon's website. They don't mention that you need any commercial compilers to build the firmware from the sources... Maybe the RockBox folks should have a look at that source code...
The scans are generally used to identify all chips and circuits, in order to track down exactly what they are and what they are used for.
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