On Sun, Oct 13, 2019 at 1:28 AM <[email protected]> wrote: > > Hi > I’ve seen an EHCI debug dongle in the old wiki. I’m trying to build one for 2 > purposes: debug a homebrew os/Shell and make it a new UEFI bootloader. > However I don’t know where to find further documentation or comments about > this. I also dont’ know what is the current or most up to date schematic to > build the “sandwich” and what tracks cut and what not. I have bought those > blue cypress FX2LP boards and I don’t know how to check revisions. Also, > I’dont know exactly what software can be used to control it. It would be > desirable if one can send stop or install some breakpoints with Visual > studio’s debugger or WinDBG or GDB or something like that. > thanks in advance for your advice.
Hi I created the original FX2LP dongle sandwich, crafting together pieces from different fx2lib sources back in 2013. I think my repository regressed (no longer built) already in 2014-2015 after some sdcc update and I never had interest to maintain that; coreboot devs had switched to USB gadgets like BBB screwdriver and dual-FT232H. There was further work [1] linked in wiki that claims to work as a compatible net20dc replacement with windows kernel debugger. I never built or run that firmware. I may still have the hardware somewhere but I don't remember them having any distinct PCB revision silkscreens printed, you just need to trace the pins. The FX2LP boards I had were actually relabeled FX2, which might also may break net20dc compatibility. I would go with one of the other non-FX2LP approaches instead: - use pre-built beaglebone black screwdriver image, route USB gadget (g_dbpg) to TCP (how to make it appear as virtual COM port for WinDBG I have no clue of) - some phone or devboard with USB OTG 2.0 operating in device mode, otherwise same as above - in case you develop with some TianoCore / EDK, which claims net20dc support, make it compatible with FT232H, it should be just a matter of sending couple different USB packets [2] [1] https://github.com/night199uk/fx2lib/pull/2 [2] https://review.coreboot.org/c/coreboot/+/10063 Kyösti _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
