Bump esp-tools (March 2021)

[zitaofang]

Related issue: N/A

Type of change: other enhancement

Impact: software change

Release Notes

Bump esp-tools to March 2021 version

[alonamid]

Should this also include a bump of upstream riscv-isa-sim and riscv-pk to keep them in sync?

[zitaofang]

This PR is ready. Check the PR listed above for submodule PR.

[alonamid]

Could this PR also bump riscv-tools to the equivalent commits, so we can make sure that esp-tools and riscv-tools are aligned?

[zitaofang]

Someone touched the instruction struct in the upstream Spike after my PR for multi-extension support was merged, breaking all of our custom extensions. Time is running out, so I am only modifying esp-tools (since people must use it if they want to use our extension anyway) to solve the problem for this release. I will submit another upstream PR to fix this bug, and we could merge that fix in the next bump.

[zitaofang]

Never mind, they fixed it in the latest version of spike.

[alonamid]

Suspecting there might bit a merge issue that may have overwritten some files (in particular, extension reset within spike_main/spike.cc ) , but will merge this since tests seem to pass with hwacha, and gemmini has added a workaround in the tests.