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The OpenPiton framework has a generic PMU that is not used by OpenSBI. Due to OpenSBI’s build system we cannot directly reuse the generic platform functions, so move the OpenPiton platform to generic. Also due to the generic platform is where new features are added. Signed-off-by: Manuel Hernández Méndez <maherme.dev@gmail.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20250813104759.33276-1-maherme.dev@gmail.com Signed-off-by: Anup Patel <anup@brainfault.org>
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OpenPiton FPGA SoC Platform
OpenPiton is the world's first open source, general purpose, multithreaded manycore processor. It is a tiled manycore framework scalable from one to 1/2 billion cores. Currently, OpenPiton supports the 64bit Ariane RISC-V processor from ETH Zurich. To this end, Ariane has been equipped with a different L1 cache subsystem that follows a write-through protocol and that has support for cache invalidations and atomics.
To build platform specific library and firmwares, provide the PLATFORM=generic
parameter to the top level make command.
Platform Options
The OpenPiton platform does not have any platform-specific options.
Building Ariane FPGA Platform
Linux Kernel Payload
make PLATFORM=generic FW_PAYLOAD_PATH=<linux_build_directory>/arch/riscv/boot/Image
Booting Ariane FPGA Platform
Linux Kernel Payload
As Linux kernel image is embedded in the OpenSBI firmware binary, Ariane will directly boot into Linux directly after powered on.