Coreforge

The pi5 firmware really doesn't like if you mess with the connection to the RP1 in any way, disconnecting just one lane seems to already make it fail. I don't know if maybe putting a PCIe switch in between could work (but it seems a bit unlikely), but I don't really have the soldering equipment to try that right now (without the risk of just fully breaking this thing being too high, which I'd rather not do)

Got a CM5 now, hopefully I won't break it immediately :3
(looks like the firmware probably wouldn't like what I originally wanted to do, but there's still a couple options I want to try)

@scavello @thomasjwebb .wang domains also give you some pretty good options (but half the thesaurus for some words is already taken)

With that fixed, it's still down at 25fps often enough (mostly CPU bound, the GPU is getting bored)

The steam arm64 beta looks pretty neat so far, much lower ram usage then the last time I got it running on box64 (which was a good bit ago to be fair). And I ran into opcodes again which I haven't handled yet in the alignment trap with DOOM 2016, fun

apparently even PCIe gen2 works with my loose wire setup, with still no errors reported (and the speed did double from gen1). gen3 gets no link though, which isn't really a surprise.

To read out the iNVM, read 64 32-bit words starting at 0x12120 from BAR 0 of the controller (with something like pcimem). This does (or at least should) contain your MAC address, if you want to keep that private.

Does anyone have an ethernet card with an intel i210 or i211 controller on hand that they could read something from (specifically the iNVM)? This requires root access on linux.

I want to compare if maybe the iNVM configuration is keeping this chip from starting up properly, and since it's OTP, I only have a limited amount of tries to change things. There's probably something in the UEFI that handles whatever additional setup is needed, but I haven't found that part yet unfortunately.

@omegatotal@mas.to I guess that would work. I haven't had VCore turned on yet, but that can go up to 1.5V, which I think is the highest of the high power rails on the socket. For anything that's not a compute module (and for those as well tbh), it's easier though to just take 5V from the power supply directly, or through one of the rear USB ports that don't work anyways. For a full carrier board it would be nice though if it's doable with the thickness of the inductors you'd need.

@omegatotal@mas.to someone briefly started on a cm5 carrier board. I don't think powering it through the socket would work though, the socket only provides 3.3V at the highest, and I don't know how much current you get get through there (it's only two pins)

@Holocene@techtoots.com The first HUB pcie lane on the socket (there's 16 GFX lanes, which goes to the x16 slot usually used for a GPU, 4 GPP lanes, here they're connected to the m.2 slot, and 4 HUB lanes that go to the chipset)

@chocolateloverraj@mastodon.social mostly, everything that's connected to the chipset (the x16 slot and the m.2 slot are directly connected to the CPU, so they don't work). On this board, that's four PCIe lanes distributed over four slots, a USB controller (for the USB-C port on the back), an ethernet controller (which doesn't work yet), and the USB and SATA controller integrated into the chipset.

@chocolateloverraj@mastodon.social It's connected to PCIe. The chipset is just a PCIe device.

@max@peering.social If you have a reason to actually do this, it might be. This should work fine for pretty much any chipset from B350 onwards, just firmware loading might be a bit different.

@realMagnesium12@troet.cafe I know, but that's less fun

@ronya@chaos.social GPUs were the reason I bought this pi in the first place, but those have been working for a little while now

@Foxarc@furry.engineer I usually post it in the github issue. high-speed now works too though

only usb full-speed for now though

I got the firmware for the xhci controller in the b350 loaded correctly now (huge thanks to himko9)! Turns out, python is maybe not a great choice for mmio.
Oh well, the board has a few extra wires on it now (from debugging attempts).

only SATA and the PCIe switch properly work so far though, the ethernet driver fails to initialize, and USB doesn't detect any devices (on the ports where it should)

Finally tried to hook up an AM4 chipset to a raspberry pi (someone suggested this on the pi-pci repository a few years ago), and it turns out it mostly just works.