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<LinuxHackerman>
Hi folks. I have a CP2104 USB-UART adapter which also has some GPIO pins which are exposed on the adapter as well. Could I do JTAG debugging via bit-banging on those GPIOs, or will I need an extra probe device?
<PaulFertser>
LinuxHackerman: hey. Does current Linux driver implement gpiolib for that adapter?
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<LinuxHackerman>
PaulFertser: hm, not sure — I get /dev/gpiochip1 when I plug it in, but nothing in /sys/class/gpio. I'm guessing that's a matter of config though
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<PaulFertser>
LinuxHackerman: current OpenOCD has libgpiod support so worth a try
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<LinuxHackerman>
Nice! I'll see how far I get. Thanks!
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<PaulFertser>
LinuxHackerman: what distro are you using btw? Self-built kernel?
<PaulFertser>
LinuxHackerman: do you mean gpiochip1 doesn't appear in /sys/class/gpio ?
<PaulFertser>
And not in /sys/kernel/debug/gpio ?
<LinuxHackerman>
NixOS, no self-built kernel
<LinuxHackerman>
gpiochip1 appears in /dev but not in /sys/class/gpio. It is listed in /sys/kernel/debug/gpio
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<olerem>
/dev/gpiochip1 is the "new" char device interface, kind of replacement for the /sys/class/gpio interface
<LinuxHackerman>
yeah
<LinuxHackerman>
and I saw in the kernel docs that the sysfs interface would be removed in 2020, and I'm using 5.13, so I guess that's the case for my kernel
<PaulFertser>
LinuxHackerman: libgpiod interface driver should work for you
<LinuxHackerman>
yeah, just rebuilding openocd with libgpiod support…
<LinuxHackerman>
uuuuh. It segfaulted.
<LinuxHackerman>
But without debug_level 4 it doesn't. Fun
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<PaulFertser>
LinuxHackerman: patches welcome :)
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<LinuxHackerman>
OK, seems it was due to loose connections. After soldering everything in place, it's not happening anymore.
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<PaulFertser>
LinuxHackerman: still a segfault is a segfault, if you can reproduce it, get a core dump would be nice to have it to be abel to fix.
<LinuxHackerman>
yeah I can share a coredump, don't think I have the cycles available to work my way into the openocd code and do any debugging/fixing myself though
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<PaulFertser>
LinuxHackerman: load it in your gdb, do "bt all" and share that please, along with the output; should be enough.
<LinuxHackerman>
I don't have debugging symbols unfortunately, so `bt all` doesn't work. I can try reproducing it at a later point with a debug build, but for now I'll just share the "non-full" backtraces that I have
<LinuxHackerman>
I got the first one about 4 times, the second only once.
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<PaulFertser>
LinuxHackerman: hm, by default when you build OpenOCD it has debug symbols in src/openocd and only after you "make install" they get stripped.
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<c4017w__>
Can `verify_image` be forced to used binary compare instead of the CRC algo?
<PaulFertser>
c4017w__: when CRC is different they'll do the comparison, why?
<c4017w__>
I don't want the algo loaded at all. I have important stuff in RAM that shouldn't be overwritten
<PaulFertser>
c4017w__: then do not specify working memory and it'll fall back to fetching data.
<c4017w__>
Ah good idea!
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