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| lkcl_ | somlo, yes, i saw the CSRs after investigating a bit more - pythondata_cpu_microwatt provides its own version of timer0_value_read (and write?) | 09:37 |
|---|---|---|
| lkcl_ | however they happen not to be used | 09:38 |
| lkcl_ | am still getting these: | 09:39 |
| lkcl_ | Memtest at 0x0000000040000000... | 09:39 |
| lkcl_ | [bus: 0x0]: 0xaaaa0000 vs 0xaaaaaaaa | 09:39 |
| lkcl_ | that's after putting in a nmigen-based wishbone 64-to-32-bit downconverter. yet in sim it's fine | 09:40 |
| daveshah | Is picorv32 reliably working fine at the same frequency? | 09:48 |
| lkcl_ | daveshah: yes | 10:06 |
| lkcl_ | 55mhz | 10:06 |
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| lkcl_ | i've put in a system for dumping GPRs (implemented microwatt's DMI interface) | 10:09 |
| lkcl_ | and a way to activate that on a "range" of values of PC | 10:10 |
| lkcl_ | then ran it on both microwatt and libresoc and did a diff | 10:10 |
| lkcl_ | that told me that somewhere a couple of GPRs end up being different | 10:11 |
| lkcl_ | now of course i need to do a binary search tracking down which function causes that difference | 10:12 |
| lkcl_ | am just going to have to be veeeery patient. | 10:15 |
| lkcl_ | daveshah: the only main difference which *might* affect timing (somehow?) is that instruction read is still 64-bit. however i am beginning to suspect something else going on, and will start running some of microwatt unit tests | 10:34 |
| lkcl_ | ah! i have errors i can track down! alriiiight. progress | 10:50 |
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| lkcl_ | daveshah: running a microwatt unit test, found 4 ALU bugs (whoops) - andc, orc, modsd, divsd. will come back to memtest once i'm confident these are dealt with :) | 15:30 |
| daveshah | I think Dolu ran VexRiscv in Verilator lockstep with a reference C++ model to debug Linux in litex startup | 15:31 |
| daveshah | any divergence in register value would stop the sim | 15:31 |
| lkcl_ | niice | 15:32 |
| lkcl_ | i'm doing something similar in the unit tests | 15:33 |
| lkcl_ | we have a python-based cycle-accurate POWER9 simulator being developed co-simultaneously with the HDL | 15:33 |
| lkcl_ | except, running large programs takes... a while :) | 15:34 |
| futarisIRCcloud | https://spoolqueue.com/new-design/fpga/migen/litex/2020/08/11/acorn-cle-215.html | 15:49 |
| tpb | Title: Running Linux on the Acorn CLE-215+ | The Spool Queue (at spoolqueue.com) | 15:49 |
| futarisIRCcloud | Didn't see this blog post from a couple weeks ago | 15:50 |
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| lkcl_ | futarisIRCcloud: wow, he got linux up and running on it, including a uart and sdmmc - despite the fact that those PCBs have what... 12 pins? :) | 19:12 |
| _florent_ | futarisIRCcloud: nice, thanks for sharing, i'm also interested in getting LitePCIe working in Root mode, i'll get in touch with him to see if we could collaborate on this | 19:38 |
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