Status of RISCV port on sis

Jiri Gaisler jiri at
Sun Jan 13 15:30:26 UTC 2019

On 1/13/19 2:48 PM, Sebastian Huber wrote:
> ----- Am 13. Jan 2019 um 0:09 schrieb Jiri Gaisler jiri at
>> On 1/11/19 1:36 PM, Jiri Gaisler wrote:
>>> On 1/9/19 10:46 AM, Sebastian Huber wrote:
>>>> Hello Jiri,
>>>> could you please rebase your work to this RTEMS commit:
>>> This works fine for me - I can now pass all uni-processor tests. On SMP, I still
>>> have a few fails but I think they are related to the simulator and the
>>> compressed RISC-V instruction set. I will investigate further ...
>> The atomic LR/SC instructions did not work as expected in the simulator, which
>> caused the failures. After cleaning that up, all tests now pass. I have tested
>> up to 4 cpus and various frequencies and time slots in the sim with no fails,
>> so it seems fairly robust. I will clean up my bsp sources and post the patches
>> on the list for review. I will also provide a patch for the RISC-V version of
>> gdb-8.2 to add the new sim. Thanks for the help to get this going..!
>> $ rtems-test --rtems-bsp=riscv-sis riscv-rtems5/c/grlib/testsuites --log=all.txt
>> Passed:        630
>> Failed:          0
>> User Input:      5
>> Expected Fail:   0
>> Indeterminate:   0
>> Benchmark:       3
>> Timeout:         0
>> Invalid:         0
>> Wrong Version:   0
>> Wrong Build:     0
>> Wrong Tools:     0
>> ------------------
>> Total:         638
>> User Input:
>>  monitor.exe
>>  termios.exe
>>  top.exe
>>  capture.exe
>>  fileio.exe
>> Benchmark:
>>  linpack.exe
>>  dhrystone.exe
>>  whetstone.exe
>> Average test time: 0:00:00.732410
>> Testing time     : 0:07:47.277261
> This is really great. This is the second free simulator (the other is SIS) which is capable enough to run all tests successfully. We should think about making a RISC-V BSP the default in the documentation instead of erc32.

Good idea. ERC32 is getting old and is not really known outside the space community. I still need to add the M, F and D extensions to the RISC-V sim though, so we can test all of the (32-bit) combinations. I should be able to do this next week and then I can post all patches for review and testing. Code coverage support is still on the list, it will follow once the sim has settled a bit ...

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