SDCC-compileable replacements for coldboot.bin and pilot.bin? about openrabbit HOT 8 OPEN

This would essentially be done by translating the Dynamic C source at https://github.com/digidotcom/DCRabbit_10/tree/master/ColdBoot to sdas syntax (despite being named .C these are actually assembler source files). Then we could compare the resulting binary to the coldboot.bin and pilot.bin that come with Dynamic C.

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At least the source for pilot.bin from Dynamic C 10 won't work, as it uses Rabbit 4000-specific instructions that won't work on Rabbit 2000 and 3000. Need to check coldboot.bin (and see if pilot.bin source from Dynamic C 9 will be released as free software).

See also: digidotcom/DCRabbit_9#3

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Source for pilot.bin and coldboot.bin suitable for Rabbit 2000 and 3000 from Dynamic C 9 has just been released under MPL:
digidotcom/DCRabbit_9@d939c14

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The coldoad branch now has coldboot.bin source that can be compiled with SDCC.
Doing the same for pilot.bin would be possible, but more work.

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It should be safe to remove the nop opcodes and trailing instructions. As mentioned in our other communications, I believe the nops are placeholders for debugging via rst28 opcodes and unnecessary, and the 5 instructions at the end are unused/unnecessary.

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I intent to remove them later, once I have the RFU-equivalent functionality working with OpenRabbit.

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In current trunk, the unneeded instruction in coldload.bin are removed. It still works fine.

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Replacing pilot.bin will be harder. The source is mostly assembler code with C declarations. SDCC is a great C compiler, but it doesn not support as much interaction between C and assembler as Dynamic C does. This will be more of a rewrite than a simple syntax translation.

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