README - eCos OpenRISC Port

For those unfamiliar with OpenRISC, it is an open-source RISC/DSP processor architecture. OpenCores.org makes available an implementation of this architecture that can be synthesized, for example, as part of an FPGA or ASIC. The port of eCos to OpenRISC was sponsored by the Rosum Corporation.
A few notes and caveats about the eCos OpenRISC port:

- The only platform supported at this time is ORP (OpenRISC Reference Platform).
- The only ORP devices supported so far are serial ports used for diagnostic and debugging purposes and AM29LVxxxx Flash ROM.
- To build and debug, you must build the GNU development tools from source available at the OpenCores web site -- not the versions available from the GNU web site or elsewhere. There is a shell script in this directory that will assist in downloading and building the GNU toolchain.
- For debugging, you can use either gdb's JTAG target or the serial target. The latter has some advantages, e.g. the gdb serial target is thread-aware, but it is much slower, especially while simulating.

Scott Furman
sfurman at rosum dot com