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Mmmm... Pin-7 at the tuner connector is an (unused) I2S signal line. Which means it's a serial line of some kind. I dunno where it terminates on the mainboard, though.



I don't think I can use pin-7 because I2S is a serial audio bus format (the format CD players send to the D/A converter). It probably terminates in the DSP. Does your kernel support/initialize three uarts?



Yeah, it must go to the DSP then. The main SA1100 CPU has three serial ports configured: one for the back panel, one for the tuner, and another for the I/R transceiver (not the remote control, the *other* I/R that's unused).

To use the tuner serial port, some extra hackery will be needed inside the kernel to isolate your use of it from that of the player software and Hijack. Perfectly doable, and as you surmised it's likely the only solution that can be done without hardware hackery.

Cheers