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| danderson | Mellow greetings. I'm starting out in FPGAs with an ECP5 board, and the demo blinky program I used to test my toolchain disables a bunch of things: `synth_ecp5 -nomux -nodram -noccu2 -json blinky.json`. | 07:08 |
|---|---|---|
| danderson | Where might I go to learn about what those mean, and why I'd want them turned off? At a quick glance, they seem to be giving yosys less freedom to do efficient synthesis, but I don't quite see why. | 07:08 |
| danderson | I should rephrase: the yosys manual covers the "what" of those options, what I'm hoping for is the "why" :) | 07:10 |
| danderson | Looking at yosys's output, at least -noccu2 influences the synthesis quite a bit. With ccu2, the synth is 12 CCU2C and 31 TRELLIS_FF blocks. Without, it's 31 LUT4 and 31 TRELLIS_FF. | 07:12 |
| sensille | danderson: who told you to do so? i don't use those options with my ecp5 | 07:12 |
| danderson | sensille: Number of cells: 62 | 07:13 |
| danderson | LUT4 31 | 07:13 |
| danderson | TRELLIS_FF 31 | 07:13 |
| danderson | gah, sorry. | 07:13 |
| danderson | What I was *trying* to paste: https://github.com/ulx3s/blink | 07:13 |
| danderson | That's the project I'm using to do basic toolchain verification, i.e. "do I have the right bits installed" | 07:13 |
| danderson | now I'm dissecting its makefile to understand the build process, and those synthesis options are what it uses. | 07:14 |
| danderson | Sounds like this may be a case of "remove those switches until you understand why you'd want them" :) | 07:14 |
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| sensille | yeah | 07:18 |
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| danderson | Ah, this blinky project was adapted from another blinky that dates to the early days of ECP5 support. So, I'm suspecting that those disabled things used to not work. | 07:21 |
| sensille | haha, from the early days of blinky | 07:24 |
| danderson | The heady days where leds only blunk after careful coaxing | 07:24 |
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| corecode | tnt: doom project is great! | 23:25 |
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