The project detour number...I lost count...is progressing quite nicely. The goal is to line up the edges. Instead of the brain-dead-simple (too high? -1 too low? +1) logic, I need to write a PID controller (or something like it) to avoid this sort of amusing to watch hunting. #electronics
@jeffpc yup. it's kinda funny how close to the limit of single-ended signalling PCI was on regular FR4 boards. the insertion loss is pretty massive so you dump a ton of power trying to drive the bus over the distance of an ATX board. reflected wave was just enough to make it workable.
Perhaps a silly question... what's the easiest way to use #pkgbase in a #FreeBSD jail? All the instructions I found just install FreeBSD-* which seems...excessive.
@gsuberland well, I'd use pkgbase to make a template that I'd zfs clone for each jail, but that's (IMO) not relevant.
The "problem" is that I can't seem to find a list of packages that correspond to base.txz or more accurately a list of packages that are required in a jail. I don't need to waste 100s of MB on what amounts to kernel*.txz, etc.
@jeffpc not sure exactly the best approach for that. if the goal is to have some default set of packages when you create a jail, it might make more sense to have an installer script that you run in the jail, so you don't end up with weird complexities when you're doing jail upgrades.
#PBC layout question for anyone who knows more than I do about the subject (essentially everyone)...
Is it ok to put decoupling caps under the #iCE40 package (like the 3 red ones in the image) or am I better off keeping them on the same side as the IC (like the blue ones)? I only have 2 layers to play with and lots of routing on one (still to do on blue), so plan to use the other as (mostly) ground plane and power anyway.
@jeffpc Having them on the other side looks fine to me, as long as they don't split up your ground plane too badly and you keep ground loops in mind. You add a bit of inductance with those vias, but since that chip is in a massive LQFP with long (~10mm) internal leads anyway, that 1.5mm should hardly matter. To keep inductance as low as possible, I'd maybe consider using wider traces where possible (e.g. from via to cap), and making the vias wider where space is available.
Any recommendations for a graphics card for a #FreeBSD desktop? I've been using a ~10 year old nvidia card, but the drivers haven't been updated in a while and have incomplete implementation of libEGL (see bug 263347) which makes some 3D accelerated software (like kicad) crash.
So, even though the current card still works, the closed source nature of the "driver" is making me consider replacing it with something that works and is open source.
It is my understanding that EGL is not X11 specific, and so I assume Wayland would be affected as well. I haven't paid attention to the whole X11 vs. Wayland thing... aside from occasionally dreading the inevitable breakage as software switches over.
@jeffpc from what I've heard, the switch to Wayland is pretty smooth, and a lot of apps have already gotten past the initial hurdle of bypassing a lot of the X-specific hacks they had to make, but on the flipside there are some major regressions in accessibility features in Wayland that the blind and disabled communities are less than happy about.
I guess maybe try 27pF or 22pF if you have them - could be that the capacitance they spec is the nominal parallel, in which case 30pF would be a smidge over given the parasitics. All just a bit of a crapshoot.
I though Iโd learn #Morse code and #AVR programming at the same time. I started with an ATmega48P gating a 555 generating a tone. But thatโs boring. So, I extended my code to generate #MIDI messages toggling D#6 on and off. #hamradio#electronics