Saturday, 2019-04-27

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mithroxobs: https://github.com/enjoy-digital/litex/pull/175/files00:10
tpbTitle: Standardizing `cpu_variants` and adding lots of documentation by mithro · Pull Request #175 · enjoy-digital/litex · GitHub (at github.com)00:10
xobsmithro: that looks like a refreshing standardization of the default options!01:42
xobsvexriscv has the option to add "c" instructions too, by the way.  I don't know how important that is.01:42
mithroxobs: I also added some info about compatible firmware options.01:43
mithroWith some recommendations on when to use each type of firmware.01:43
xobsThat's a good idea.01:47
xobsNote that for Fomu, we're using an external vexriscv CPU, because I'm still doing experiments.01:48
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xobsHmm... My Windows machine is having all sorts of issues enumerating this device.  I wonder what's going wrong.10:27
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synaption[m]hi!  I have a bag of fomus without bootloaders.  I'm trying to use fomu-pi-gen, but that just failed to build the image.  I was wondering if someone had a prebuilt image or knows what I should do about this error:22:43
synaption[m]losetup: /pi-gen/work/2019-04-27-Fomu-Dev/export-image/-v1.2.8-fomu.img: failed to set up loop device: No such file or directory22:44
kerelsynaption[m]: The pre-built images are part of the releases at https://github.com/im-tomu/fomu-pi-gen/releases22:52
tpbTitle: Releases · im-tomu/fomu-pi-gen · GitHub (at github.com)22:52
kerelThe Fomu-Dev-*-fomu.zip file seems to contain the image.22:53
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synaption[m]thanks!  looks promising22:56
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futarisIRCcloudxobs / mithro: "c" instructions are important on vexriscv, if you are flash / memory constrained. Something is broken in the decoder, so it's been disabled for linux, at the moment.23:06
futarisIRCcloudIt's RISC-V's equivalent of ARM's Thumb-2.23:06
futarisIRCcloudsynaption[m] : The images should work any Raspberry Pi. I used a Raspberry Pi (1) and it worked fine.23:08
tnthow many cycles does it take the vex to execute instructions ?23:09
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futarisIRCcloudhttps://tomverbeure.github.io/rtl/2018/12/06/The-VexRiscV-CPU-A-New-Way-To-Design.html23:23
tpbTitle: The VexRiscV CPU - A New Way to Design | Electronics etc… (at tomverbeure.github.io)23:23
futarisIRCcloudIf we want smaller code-size, perhaps we need to run a Z80 or 6502.23:24
futarisIRCcloudhttps://github.com/abnoname/iceZ0mb1e23:24
tpbTitle: GitHub - abnoname/iceZ0mb1e: FPGA 8-Bit TV80 SoC for Lattice iCE40 with complete open-source toolchain flow using yosys and SDCC (at github.com)23:24
futarisIRCcloudhttps://github.com/emeb/up5k_basic23:24
tpbTitle: GitHub - emeb/up5k_basic: A small 6502 system with MS BASIC in ROM (at github.com)23:24
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