✧✦✶✷Catherine✷✶✦✧
✔ make one part of a RGMII MAC work by adding LUT4s to a design that do nothing
✔ make the other part of the RGMII MAC work by rearranging some of the wires to connect the exact same pins but with different wires adjacent to each other
today is sorcery day
✧✦✶✷Catherine✷✶✦✧
and yet, it works
✧✦✶✷Catherine✷✶✦✧
i wired this up and wrote half this code so high on progesterone i can only somewhat remember what i was doing and struggled with the list comprehension syntax at one point, and now Wanda is like "I have absolutely no reason to connect to WiFi, this works just fine"
incredible
Foone🏳️⚧️
@whitequark I had no idea it was even possible to get "high" on progesterone. Interesting
✧✦✶✷Catherine✷✶✦✧
this is @mwk logging in through the glasgownet, running in 10 Mbps mode with a quirk
the quirk is that if you send two packets "too quickly" they get glued into a single packet, either direction
somehow, Element (two copies, concurrently), Akkoma, Discord, and other webpages still manage to load in this environment
✧✦✶✷Catherine✷✶✦✧
going to 100 Mbps makes packets arrive "too quickly" less often and makes it not merely work, but be _usable_
you can _watch video_. also you get the right blinkenlights :D
incredible. i built an Ethernet MAC that doesn't even packetize things properly and TCP/IP still functions well using it
i love technology
✧✦✶✷Catherine✷✶✦✧
look at how incredibly crude it is! it's barely even _doing_ anything. it's using a bunch of LUTs to delay the clocks. it's doing things with clock domains that aren't discussed in polite audience. it completely disregards the boundaries of Ethernet frames and just kind of shoves them into the other pipe. the PHY is connected to the MAC using wiring so shoddy half the time the bug was "oh, TXCTL fell out of the socket again". there's only one ground pin connected (the one paired with TXCLK)!
✧✦✶✷Catherine✷✶✦✧
and i had to give TXCLK (yellow) its own ground (orange) or i'd get Bonus Nibbles every time the data bus would transition 0->f
✧✦✶✷Catherine✷✶✦✧
i don't know what's worse, that i understand signal integrity well enough to make this work, or that i continue to make assemblies like this despite understanding signal integrity enough to make them work
✧✦✶✷Catherine✷✶✦✧
we tried to make the laptop on the other side of this contraption route through the glasgownet and the linux kernel panicked
✧✦✶✷Catherine✷✶✦✧
Lattice iCE40 doesn't have IODELAY but we have IODELAY at home
(yes, this actually does delay the clock somewhat reliably, before/after for length=8)
Foone🏳️⚧️
@whitequark yikes. Sorry to hear that!
✧✦✶✷Catherine✷✶✦✧
@foone uh... so, what you do is you take More Progesterone until it makes you high.
however!
it might very well cause you to suddenly lose consciousness. so please do not do this in any situation where you might fall. because you could seriously hurt yourself. (i did once! six broken bones. though i was also on a scooter)
Foone🏳️⚧️
@manawyrm @whitequark "I don't think anyone's going to try and build a router with a glasgow"
NOT WITH THAT ADDITUDE!
Manawyrm | Sarah
@whitequark I didn't actually want to say: "you'll need to fix that", I don't think anyone's going to try and build a router with a glasgow 😹
just mostly a fun real-world example for buffer handling.
✧✦✶✷Catherine✷✶✦✧
@manawyrm it feels like normal web browsing for the most part
re bufferbloat, buffer management with glasgow gets really hard due to the complex interplay between usb, fx2 bus, and python... i'm actually quite happy how it works with the default settings
✧✦✶✷Catherine✷✶✦✧
@manawyrm hey, i get 1-2 ms end to end ping! that's not so bad
Manawyrm | Sarah
@whitequark but 235ms under load according to speedtest.net.
I'm guessing that's already noticable when just surfing the web via the gadget...
Manawyrm | Sarah
@whitequark and some truely atrocious buffer bloat :)
where is Dave Taht when we need him? 😹
✧✦✶✷Catherine✷✶✦✧
43/48 Mbps is about the highest throughput we could get with basically unoptimized [for this application] Python code so far
Foone🏳️⚧️
@manawyrm @whitequark yeah if you get too many trans hackers together their cycles synchronize, except instead of anything biological it's just terrifying hacks
✧✦✶✷Catherine✷✶✦✧
@foone @manawyrm lmfao https://mastodon.social/@whitequark/112282304748081968
Manawyrm | Sarah
@whitequark @foone synchronized catgirls :3
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