Last Updated or created 2024-06-11
For my new SBC I’ll need a machine code build environment.
This is what I’ve setup now.
My main workstation is Linux based. While this setup is Linux based, vasm should work on other operating systems also.
Getting and compiling vasm for 68k
wget http://sun.hasenbraten.de/vasm/release/vasm.tar.gz tar xzvf vasm.tar.gz cd vasm # Building make CPU=m68k SYNTAX=oldstyle # Using ./vasmm68k_oldstyle -m68000 -Fbin -dotdir -no-opt source.asm # this generates a.out # Dumping the file (byte separated and with a offset of 0x8000) xxd -g 1 -o 0x8000 a.out | head 00008000: 30 3c aa aa 4e f9 00 00 80 04 00 00 00 00 00 00 0<..N........... 00008010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00008020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00008030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00008040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00008050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00008060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00008070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00008080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00008090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ # But my 68k needs an ODD EVEN eeprom # so I used another tool - romsplit git clone https://github.com/ullman/romsplit cd romsplit make all # Using romsplit ./romsplit -s a.out odd.rom even.rom # Output xxd -g 1 -o 0x8000 odd | head -1 ; xxd -g 1 -o 0x8000 even | head -1 00008000: 30 aa 4e 00 80 00 00 00 00 00 00 00 00 00 00 00 0.N............. 00008000: 3c aa f9 00 04 00 00 00 00 00 00 00 00 00 00 00 <............... # Burn these with minipro
Disassemble
m68k-linux-gnu-objdump --disassemble-all --target=binary --architecture=m68k a.out