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Distillation
ID: a295f24a-9a17-4e10-8e23-ead49ba29748
Generation: 0
Tokens: 780
R_compression: 9.415
C_norm: 0.001
Archived: No
Created: 2026-06-14 09:28:51
Source IDs:
["d897e96cf4fb401bafb57395d26b0b5f","46dbe1332f30dfb4d43ac10071630636","28e5e1893e2784204fed57eae4981f69","d0e2605a9f18373b3d1fd308be1bd834","0b9d05bc2f6f0bb2c825f95a0b927976","b679ecd3266858e35b0c4f68fb8617ac","907e05214a508793a97e8109b693b7eb","a348a10e41bda27fc991f21982076f86","9110e943c24432f5662b8dd9ad6d5559","92eddcae18768775767884bc975cf79c","e739b0572f4995736401717a091e950c","2632e04cf8c946a430997c9e6f84c6f5","26978a2013f277f5f6f0411e99718b94","f4d72d9e71977da7ca90f4b3bce61b50"]
Observations
<observations>
Date: Jun 14, 2026
- 🔴 (09:25) User asserted: AVR responses are "never readable — even though the AVR is on" — confirmed serial port cannot be configured to 57600 baud due to driver limitation
- 🔴 (09:25) User decision: wants to build a newer pl2303.ko (replacing current broken module); asked whether unplug/replug is worth trying or will break again
- 🟡 (09:25) Assistant analysis: unplug/replug used to fix the issue historically — initially suggested this pointed to "wrong driver grabbed device" theory (generic usbserial binding instead of pl2303)
- 🟡 (09:25) dmesg sequence revealed: device was previously bound to usbserial_generic driver; then failed insmod attempts (Unknown symbol errors for usb_serial_handle_sysrq_char, usb_serial_generic_open, usb_serial_generic_close, usb_serial_handle_dcd_change, usb_serial_deregister_drivers, usb_serial_handle_break, usb_serial_generic_tiocmiwait, usb_serial_register_drivers); then successful pl2303 attach to ttyUSB0
- 🟡 (09:25) USB unbind/rebind test (simulating replug): unbind_exit=0, bind_exit=0; /dev/ttyUSB0 size 257 bytes at 10:15; stty still returned "Inappropriate ioctl for device" (stty_exit=1) — ruled out "wrong driver grabbed it" theory
- 🟡 (09:25) Conclusion: current pl2303.ko build genuinely cannot configure termios on PL2303GL chip on this kernel; unplug/replug likely fixed an earlier different situation (different adapter or pre-firmware-update state)
- 🔴 (09:25) Router kernel: 4.19.183, armv7l; vermagic:
4.19.183 SMP preempt mod_unload ARMv7 p2v8; built with gcc 9.2.0 (Buildroot 2019.11.1) in docker container (docker@c86ad27b3ba0); build date Mon Jan 5 21:55:12 UTC 2026
- 🔴 (09:25) No kernel headers/build dir on router; /lib/modules contains: bcmkernel, extra, kernel, modules.builtin, modules.dep, modules.order — no build symlink
- 🔴 (09:25) pl2303-build/ directory exists at /home/byk/Code/pl2303-build/ — prior build setup already present (created Feb 17, 2026) (meaning Feb 17, 2026)
- 🔴 (09:25) pl2303-build/ contains: build.sh (1381 bytes, Feb 17), Dockerfile (497 bytes, Feb 17), output/ dir (Feb 17), pl2303.c (34401 bytes, Feb 17), pl2303.h (4982 bytes, Feb 17)
- 🔴 (09:25) build.sh details: KDIR=/build/linux-4.19.183, CROSS=arm-linux-gnueabihf-, ARCH=arm; copies /output/config as .config; sets CONFIG_USB_SERIAL_PL