What is Linux/M32R?

Linux/M32R is a Linux distribution for M32R, which is a 32-bit RISC microprocessor of Renesas Technology.

The Linux/M32R supports both 2.4 and 2.6 kernels; 2.4.31 and 2.6.14 kernels are now available.
Several device drivers (LAN, CF, USB, MTD, etc.) have already ported.

These kernels also support SMP features for a multiprocessing environment on an M32R multiprocessor system on FPGAs and/or an M32R single-chip multiprocessor.

The Linux/M32R is based on the Debian GNU/Linux distribution. More than 300 unofficial .deb packages are available.

Boot log (On M32R single-chip multiprocessor@200MHz) - Debian GNU/Linux on M32R
Boot log (On M32R single-chip multiprocessor@300MHz) new
- Debian GNU/Linux on M32R, booted by using a new boot loader "m32r-g00ff".

Boot log (On 4CPU FPGA@10MHz)
Movie of booting kernel (On FPGA@25MHz)
Movie of booting X (On FPGA@25MHz)

Screenshot of X on Linux/M32R

M32R Architecture

OPSP manuals

The OPSP is a processor which was designed based on the M32R specification.
This development was funded and supported by NEDO (New Energy and Industrial Technology Development Organization) of Japan.

Misc.

Specifications

M32R ABI Spec. DRAFT V0.0 (TXT)
M32R ELF ABI Spec. V1.2 (PDF) (2004/08/26)

Publications

Porting Linux to the M32R Processor @OLS2003 (July 23-26,2003, Ottawa, Canada), OHP
A 600MHz Single-Chip Multiprocessor with 4.8GB/s Internal Shared Pipelined Bus and 512kB Internal Memory @ISSCC2003
Linux/M32R - An M32R GNU/Linux Software Platform @AsiaOSS2004 (Mar.8-10,2004, Hanoi, Vietnam)