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platform: Add OpenPiton platform support

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OpenPiton is a research platform from Princeton University [1].

"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."

Add OpenSBI support for OpenPiton. As it is based on ariane core,
it reuses the platform code from arine project.

[1]. https://github.com/PrincetonUniversity/openpiton

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2020-03-23 12:48:56 -07:00
committed by Anup Patel
parent ed265b4498
commit fb84879e66
6 changed files with 280 additions and 0 deletions
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33
docs/platform/fpga-openpiton.md Normal file
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@@ -0,0 +1,33 @@
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=fpga/openpiton* 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=fpga/openpiton 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.

4
docs/platform/platform.md
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@@ -25,6 +25,9 @@ OpenSBI currently supports the following virtual and hardware platforms:
* **Spike**: Platform support for the Spike emulator.
* **OpenPiton FPGA SoC**: Platform support OpenPiton research platform based on
ariane core.
The code for these supported platforms can be used as example to implement
support for other platforms. The *platform/template* directory also provides
template files for implementing support for a new platform. The *object.mk*,
@@ -37,3 +40,4 @@ facilitate the implementation.
[andes_ae350.md]: andes-ae350.md
[thead-c910.md]: thead-c910.md
[spike.md]: spike.md
[fpga_openpiton.md]: fpga_openpiton.md