Thursday, 2020-01-02

« Wednesday, 2020-01-01 Index Friday, 2020-01-03 »
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xobsvesim: Hooray!  Glad it's working -- that's a big improvement :)01:07
xobsSadly, I don't think the clock can go much faster.  From synthesis: `Info: Max frequency for clock 'clk12_$glb_clk': 16.03 MHz (PASS at 12.00 MHz)`01:07
xobsMake sure you're building with `-Os`, and that you put any hot functions in RAM.01:08
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futarisIRCcloudvesim: umull (ARM) -> mul (RISC-V) ?01:44
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xobsIf anyone wants to work on the Random block, that would be a Good First Issue.02:16
xobsCopy https://github.com/im-tomu/foboot/blob/master/hw/foboot-bitstream.py and remove most of the stuff, then make it so it builds without a CPU (only DummyUSB), then fill in a basic Ring Oscillator.  Then you can debug it with wishbone-util.02:18
tpbTitle: foboot/foboot-bitstream.py at master · im-tomu/foboot · GitHub (at github.com)02:18
xobsvesim: in case you're curious, the CPU definition is at https://github.com/xobs/VexRiscv-verilog/blob/master/src/main/scala/vexriscv/GenFomuCrypto.scala (with the CPU actually at https://github.com/xobs/VexRiscv-verilog/blob/master/VexRiscv_Fomu_Crypto.v)02:22
tpbTitle: VexRiscv-verilog/GenFomuCrypto.scala at master · xobs/VexRiscv-verilog · GitHub (at github.com)02:22
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vesimxobs: i've moved everything related to crypto to ram and use -O3, that is giving the best performance11:07
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mithroxobs: What does rm mean?12:13
mithrovesim: Ariane is a very poor fit to FPGAs12:13
xobsReference Manual12:17
gurke_i'm still digging into all that stuff which is quite new for me - so please excuse silly looking questions12:28
mithroxobs: Can you keep rs in the name of https://github.com/im-tomu/fomu-pac ?12:28
tpbTitle: im-tomu/fomu-pac · GitHub (at github.com)12:28
gurke_to me it looks like vexrisc-v and picorv are sometimes used interchangeably - how do both compare?12:32
gurke_also, the bootloader seems to contain some code for both12:33
xobsmithro: sure, the actual Rust crate name will be `fomu-pac`, but the git repo address is now `fomu-rs-pac`.12:33
xobsgurke_: they're both flavours of riscv core.  Some of the foboot code is taken from litex, which supports 5-6 CPU cores including both vexriscv and picorv32.12:34
xobspicorv32 is written entirely in Verilog, and is very approachable and easy to understand.12:34
mithroxobs: Great! that works for me12:35
xobsVexriscv is written in Scala, and is super extensible (it scales from Fomu all the way up to Linux), but is harder to understand.12:35
mithropicorv32 was designed from to try and get a very high fmax -- even at the expense for actual performance -- it's designed to run in the same clock domain as a peripheral it is controlling so you don't have to pay CDC stuff12:36
* mithro is slowly catching up on all the email he has been ignoring12:37
gurke_ok, so regarding fomu, both are basically exchangeable? how do they compare regarding required "gate space" (or how is that called?)12:38
gurke_mithro: ok, thx - what is CDC ?12:38
mithroClock DOmain Crossing12:42
xobsFomu uses vexriscv.  We use it in a small configuration with only two pipeline stages, no multiply or divide unit, but with an MMU and a 2048-byte icache.12:42
xobsBut yesterday I made a configuration of the cpu for vesim that had no MMU or debugger, but with a multiply, divide, and single-cycle shifter.12:43
david-sawatzke[mxobs: Small nitpick, but isn't the common rust repo naming pattern adding "-rs" at the end of the repo name?12:49
xobsdavid-sawatzke: Sure, so change it to fomu-pac-rs?12:50
gurke_ok, in the bootloader, there are a few references to picorv32, mainly a control register and some SPI stuff - so this isn't actually used?12:50
david-sawatzke[mYeah12:50
david-sawatzke[mShould i just push my commits?12:51
xobsYes please.  I changed the URL to https://github.com/im-tomu/fomu-pac-rs12:51
tpbTitle: im-tomu/fomu-pac-rs · GitHub (at github.com)12:51
xobsgurke_: Yeah, vexriscv has a different IRQ CSR than picorv32.12:52
xobsThe picorv32 code isn't actually used, and could safely be removed.12:52
gurke_ok, thx12:53
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vesimxobs: is there a space to enable MMU?13:41
xobsvesim: Can't fit the MMU + multiply unit currently.13:41
xobsAlso, I've never actually tried enabling it.  But the `satp` register is there.13:41
vesim:(13:44
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mithroxobs: Does https://github.com/litex-hub/litex-boards/pull/30/files look right?14:00
tpbTitle: Updating the templates for Fomu. by mithro · Pull Request #30 · litex-hub/litex-boards · GitHub (at github.com)14:00
xobsmithro: it does, in that it is a copy of the fix _florent_ did in foboot.14:01
xobsSo I'd say it looks good!14:02
mithroxobs: I'll leave you in charge of https://github.com/im-tomu/fomu-workshop/pull/94 ?14:05
tpbTitle: Add Rust example by Tiwalun · Pull Request #94 · im-tomu/fomu-workshop · GitHub (at github.com)14:05
mithroxobs: https://github.com/im-tomu/fomu-workshop/pull/108/files ?14:09
tpbTitle: Remove old riscv-usb-cdcacm code example. by mithro · Pull Request #108 · im-tomu/fomu-workshop · GitHub (at github.com)14:09
xobsmithro: good idea. I was never a fan of that example. And tinyusb does it so much better.14:10
tiwalunxobs: can you please make a new release of the fomu-rt crate? Then I can remove the patch from the workshop example14:24
xobsSure, let me do that.14:24
tiwalunThanks14:25
xobsPublished 0.0.4.14:27
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tiwalunI removed the patch, should be ready to review now14:40
mithroxobs: Should we add rm to the workshop?14:43
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vesim[error] (update) sbt.librarymanagement.ResolveException: unresolved dependency: default#vexriscv_2.11;0.1.0-SNAPSHOT: not found18:00
vesimhow i can fix thix issue?18:00
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vesimthat's when i try to compile vexriscv core18:00
vesimfrom your repo18:00
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vesimyaay, i've got UART working over touch pads20:37
CarlFKwut?20:37
vesimi thought that it will be more painful :D20:37
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vesimhttps://gist.github.com/vesim987/734104f80ad06a2f6faeec4c8946aeb120:41
tpbTitle: fomu uart · GitHub (at gist.github.com)20:41
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vesimso i can connect ft232r to the two side touch pads and have side channel to debug my u2f implementation20:47
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vesimand by debug i mean "print debugging" :P20:57
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CarlFKthat's pretty awesome21:02
CarlFKprint and pprint are my python debugging tools21:02
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gurke_just redoing the workshop in order to see if i can document/fix more things...22:34
gurke_on my fomu, spi.id() (in micropython) returns 0 for a pvt fomu - is that correct / expected?22:35
gurke_also, the workshop says "If we look at the generated Fomu header files, [...]" - I think a link would make sense...? Which headers should I link to?22:37
futarisIRCcloudhttps://www.cnx-software.com/2020/01/02/polos-gd32v-alef-tiny-risc-v-mcu-board/22:56
« Wednesday, 2020-01-01 Index Friday, 2020-01-03 »

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