Monday, 2018-10-15

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cr1901_modernmithro: So even the minimal lm32 variant (when I disable caches and multiplies) doesn't route nicely on up5k... something's not right here...01:53
cr1901_modernTaking a look into it...01:54
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cr1901_modernSomething _very_ strange: the pipelined barrel shifter is slower _and_ takes more resources than a multicycle shifter (it's only when you enable multicycle multiply and divide that you get an advantage)...02:20
cr1901_modernBut in any case, I'm able to get a CPU that works...02:21
mithroSo, does it work or not?02:59
cr1901_modernmithro: The minimal variant CPU works, though it takes a few minutes to route, and it technically doesn't pass timing (11.66 MHz!!!)03:14
cr1901_modernTrying micropython now03:14
cr1901_modernmithro: micropython works as well (caveat: it takes ~20 seconds to do the checksum)03:18
mithroYou should take a look at what is consuming resources03:19
mithroDo you have the cas module enabled?03:20
cr1901_modernIn any case, this is a starting point I can iteratively improve03:22
cr1901_modernmithro: Next step: Add SP_RAM support03:31
tpbTitle: GitHub - cr1901/litex-buildenv at 5k-b-evn (at
cr1901_moderncc: esden, you were curious whether lm32 would fit onto up5k (answer: yes, but it's not fast lol)03:31
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xobsmithro: The litex-buildenv compiler works now!05:26
cr1901_modernmithro: I haven't pushed it yet, but using SPRAM as sram is working05:48
cr1901_modernxobs: compiler?05:48
xobscr1901_modern: the gcc version in conda used to use a deprecated syscall mechanism.05:49
cr1901_modernoh I see05:53
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cr1901_modernmithro: This is my contribution to society for tonight06:19
tpbTitle: (WIP) ICE40UP5K-B-EVN Support by cr1901 · Pull Request #90 · timvideos/litex-buildenv · GitHub (at
shornemithro: ok, I wrote the litex version driver for linux, trying it out now06:44
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cr1901_modernxobs: How long did it take to run Vivado using exagear in your testing?07:51
cr1901_modernapropos of nothing...07:51
xobscr1901_modern: a blink led demo took about an hour.07:55
cr1901_modernThis was on Novena?07:56
xobsWould definitely recommend it. Works surprisingly well.07:56
cr1901_modernHrm... well, from my experience, running ISE on my netbook (i686, 32-bit) for a nontrivial design is about half as fast as on my current laptop (Sandy Bridge Core i7)07:57
cr1901_modernnontrivial for spartan 3 anyway07:57
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mithroshorne: Cool!16:31
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mithroHa cool ->
tpbTitle: GitHub - mgaitan/pymips: A pipelined MIPS processor implemented in Python (at
tpbTitle: GitHub - AngelTerrones/Algol: A RISC-V CPU (Outdated: using priviledge v1.7) (at
mithroDesigned completely in python using MyHDL.19:16
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