[libre-riscv-dev] microwatt feature request: "switch off all optimisations" mode
Luke Kenneth Casson Leighton
lkcl at lkcl.net
Sat Aug 1 14:55:27 BST 2020
On Friday, July 31, 2020, Luke Kenneth Casson Leighton <lkcl at lkcl.net>
> what would you suggest here? how can we "single-step" microwatt? clearly
> performance is not important: cycle-accurate comparisons is the goal.
i since realised that the DMI interface serves this purpose, and
with a little bit (or a lot) of futzing about with a FSM i should be able
to run a single instruction then cycle through all of the GPRs, PC and MSR,
dumping them out.
by implementing the same interface in libresoc i can do a cycle by cycle
comparison and find the discrepancies.
it would be particularly useful to be able to get at the SPRs and the CR as
well, this way.
is there a standard for DMI address bus locations?
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
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