Documentation is available at:

The MRISC32-A1 VHDL code is available at:

The blog posts "The MRISC32 – A vector first CPU design" and "Some features of the MRISC32 ISA" give some information regarding the architectural features of the MRISC32 ISA.

Software toolchains

There is currently an MRISC32 port of GNU binutils: mrisc32/binutils-mrisc32. It provides:

Support for higher level languages is planned (via LLVM and/or GCC), but has not yet been implemented.