Hi everybody,
We're trying to enable the USB on the J13 connector on APU3 board. It's using the EHCI1 device (ports 0 to 3). As far as I understand it, USB controllers are configured and set by the AGESA PI binary. I've tried with both versions of AGESA - the one specific for pcengines boards (`3rdparty/blobs/mainboard/pcengines/apu2/AGESA.bin`) and the latest one for this kind of chip (`3rdparty/blobs/pi/amd/00730F01/FT3b/AGESA.bin`). Both versions deliver the same results. I've managed to use the latter version by enabling all devices in `mainboard/pcengines/apu2/devicetree.cb`. I'm using the master branch of coreboot, but also I've tried with some older versions (same issue).
We're working on mainlining all the changes needed for APU3 and one of them is this USB header. It's unconnected and not used on APU2 boards, so disabled by default. Besides that, shouldn't have more changes in this area. APU3 is similar to APU2 board (the same SOC and design in general). The USB connections are on page 6 on the schematics.
My question is, what can we look for to investigate this issue further? Right now we're out of options and we don't know what to do next. We would be grateful for any insights on this matter.
* Schematics for APU2 board: https://pcengines.ch/schema/apu2c.pdf * Schematics for APU3 board: https://pcengines.ch/schema/apu3a.pdf * Diff of my changes: http://pastebin.com/8YKkzB7Z * Boot log: http://pastebin.com/uBAubrz9 * PCI config space dumps: http://pastebin.com/3aBrt6wp * lsusb dump: http://pastebin.com/V7NTWAnq