Various improvements and fixes

[jerryz123]

• Support for TightlyCoupledMemory (TCM) in the Spike model, allowing for fast Linux boot with RTL simulation of the uncore with the SpikeUltraFastConfig
• Add new "chosen" node to DTS, to request earlycon be with the sifive uart.
• Add hello-world bare-metal program
• Fix BOOM marchid
• Fix icenet/rocc issues with default marshal kernel
• Re-add password login

TODO:

• Add note on docs explaining spike-TCM
• Add RTL sim of linux boot with peripheral devices + drivers to CI

Related PRs / Issues:

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• RTL change
• Software change (RISC-V software)
• Build system change
• Other

Contributor Checklist:

• Did you set main as the base branch?
• Is this PR's title suitable for inclusion in the changelog and have you added a changelog:<topic> label?
• Did you state the type-of-change/impact?
• Did you delete any extraneous prints/debugging code?
• Did you mark the PR with a changelog: label?
• (If applicable) Did you update the conda .conda-lock.yml file if you updated the conda requirements file?
• (If applicable) Did you add documentation for the feature?
• (If applicable) Did you add a test demonstrating the PR?

• (If applicable) Did you mark the PR as Please Backport?

[abejgonzalez]

We should add a SpikeUltraFastConfig Linux boot test with RoCC instructions in CI just to ensure that things work properly.

[jerryz123]

Unfortunately I wasn't able to speed-up SpikeUltraFast fast enough to get it to chew through user code fast enough for CI.

[abejgonzalez]

Unfortunately I wasn't able to speed-up SpikeUltraFast fast enough to get it to chew through user code fast enough for CI.

Can we just add a simple test of something that just does a single user space RoCC instruction and finishes? Like build Gemmini Spike model and just do a Gemmini TLB flush.

[jerryz123]

I'll try something out

[jerryz123]

Even after 30 minutes, the SpikeUltraFast has not made its way through init. More work needs to be done to improve its performance before we can have full boot-poweroff CI on it, unfortunately.

[jerryz123]

We need to merge this while rc-blocks is failing because the fix was squash-merged into rc-blocks. #1411 will fix this.

[jerryz123]

@abejgonzalez I say we go for merge on this, #1411 is basically ready, and that will fix some of the commit-on-master checks

[abejgonzalez]

LGTM.