resources describing a musl port to a new architecture
commit introducing a new C-based crt framework, which makes writing arch-specific startup-code much simpler.
commit of the or1k port, which shows the porting work required for a new arch.
the unsquashed history of the powerpc port has been archived @ https://github.com/rofl0r/musl-ppc (branch ppc)
the unsquashed history of the x32 port has been archived @ https://github.com/rofl0r/musl (branch x32g)
AArch64 porting page.
use the libc-test testsuite to test your port.