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<tnt>
just tried Vex in icecube2 ... it got optimized down to 86 LUTs, impressive :)
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<ironsteel>
tnt, cool, compared to yosys/nextpnr?
<tnt>
ironsteel: that was a bug ... obviously. You can't implement a riscv in 86 lut4s.
<ironsteel>
ahhh xD sorry, I'm bit of an FPGA noob
<ironsteel>
so don't be surprised the next time I ask a question
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<tnt>
size wise yosys/nextpnr and icecub2 have similar results ( withing 50 LCs ~ 1800 ). And speed wise icecube still has a small advantage, ~ 10%. The gap sure is much smaller than it was a year ago :)
<ironsteel>
yeah, I was playing around with an NES port to the ice40 by daveshah, ported it from up5k to hx8k, arachne gives ~17 Mhz while nextpnr gets to ~20.500Mhz
<ironsteel>
but didn't compare it to icecube, I don't wanna touch those tools again xD
<tnt>
heh, tbh compared to ISE, getting icecube running really isn't that bad.
<ironsteel>
yes, it's much more lightweight, merely 1.1GB compared to ISE. I have a board with an spartan 6LX9 to teach myself fpga's and the first impression was "6GB download? what for?"
<ironsteel>
After discovering the open source tools that board just collects dust
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<adamgreig>
TD-Linux: ah cool! be interested to hear how you get on. what does nor flash need?
<adamgreig>
i'm interested in adding vaguely more support for things if it doesn't clash with existing stuff, e.g. i'm interested in adding bitbanged SWD support for programming cortex-m via daplink
<adamgreig>
first gotta port the python script to a rust program though :p
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<TD-Linux>
adamgreig, a zillion more pins. as a result it'll probably be more of a fork
<TD-Linux>
but most of the usb software and host software can be shared
<TD-Linux>
(I *also* just want to use it for my ice40s, which is why I ordered the existing boards)
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<adamgreig>
ack
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