I fixed the TCX mapping problem and added SMP support from Proll.
SMP is not working fully (neither was Proll), probably some problem with Qemu. I think earlier it worked. The idea is to send a soft interrupt to a halted CPU, which then awakes and begins execution. Now the CPU gets the interrupt (Qemu monitor commands info pic, info cpus confirm this) but it does not awaken.
Now the only missing functionality that Proll had is TFTP booting support. It could be possible to reuse Proll's slirp stack, but I'm not sure if it is worth the trouble. In Qemu environment booting from network is not that useful, because you can preload the kernel.
Otherwise OpenBIOS matches or exceeds Proll's capabilities. I'll propose switching to OpenBIOS to Qemu developers.
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