openhwgroup
Values for MVENDORID, MARCHID and MIMPID in the User Manual
This task is complete when:
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[ ] the proper MISA, MARCHID and MINPID values for CV32E20 is determined and captured in the User Manual.
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[x] the RTL is updated to match the UM.
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[x] the "hello-world" test-program is updated to check this value.
Establishing the numbers: VendorID is from JEDEC - we have this ArchID is assigned from RISC-V and indicates the processor - not done yet ImpID is 0 as it is the first implementation of this architecture
Documentation not updated
I believe these are the correct values:
| CORE-V Name | mvendorid | marchid | mimpid |
|---|---|---|---|
| CV32E20 | 0x00000602 | 0x00000023 | 0x00000000 |
As Duncan indicated, mvendorid has been assigned to OpenHW by JEDEC. The marchid has been assigned to the the CV32E20 by RISC-V International. Lastly, by convention, the value of mimpid for the first formal release of any CORE-V core is 0x0.
- I check the RTL implementation of values of mvendorid, marchid and mimpid.
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For value of "mvendorid", The assigned value is "0x00000602" as shown in the following line https://github.com/openhwgroup/cve2/blob/4b782ac0d7f2d3166a26cd04a807697ea536aeff/rtl/cve2_pkg.sv#L563
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For value of "marchid", The assigned value is "0x00000023" is equivalent to "0d35" as shown in the following line https://github.com/openhwgroup/cve2/blob/4b782ac0d7f2d3166a26cd04a807697ea536aeff/rtl/cve2_pkg.sv#L564 https://github.com/openhwgroup/cve2/blob/4b782ac0d7f2d3166a26cd04a807697ea536aeff/rtl/cve2_pkg.sv#L561
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For value of "mimpid", The assigned value is "0x00000000" is as shown in the following line https://github.com/openhwgroup/cve2/blob/4b782ac0d7f2d3166a26cd04a807697ea536aeff/rtl/cve2_pkg.sv#L570
- I run the hello-world program test, the program return the correct Expected values for mvendorid, marchid and mimpid defined in the following lines
https://github.com/openhwgroup/cv32e20-dv/blob/29e5f2e5e1bf6a4662149884f0e412224d5b9258/tests/programs/custom/hello-world/hello-world.c#L31
https://github.com/openhwgroup/cv32e20-dv/blob/29e5f2e5e1bf6a4662149884f0e412224d5b9258/tests/programs/custom/hello-world/hello-world.c#L33
https://github.com/openhwgroup/cv32e20-dv/blob/29e5f2e5e1bf6a4662149884f0e412224d5b9258/tests/programs/custom/hello-world/hello-world.c#L34
document is updated and waiting for reviews in the following pull request https://github.com/openhwgroup/cve2/pull/278
Update: Mohammed to update the UM as per @davideschiavone feedback.
This task has the same name as #12. I suggest changing its title to "Values for MVENDORID, MARCHID and MIMPID in the User Manual" for clarification
