Underlying IOCTL Issues

[juansta]

I am running into a problem with the underlying Linux tty serial drivers and the line controls used for board reset...

OS error: ioctl("TIOCMSET"): Input/output error

My current linux kernel is Linux 6.12.16 x86_64, and what has been working fine for many years, has only recently stopped working... A local windows VM (on the same linux host) also fails... Note that everything still works as expected if I move to a Windows laptop...

I generally use the MegaCore bundled version... But I see the same error if I run v7 or v8 of avrdude.

I have tried re-programming various versions of bootloaders, with no luck...

Any idea how to work around this ioctl call issue?
Is anyone else seeing the same, or is it just my setup?

[mcuee]

Looks like specific to the serial port driver of this Linux kernel.

What is the USB to serial chipset used? Can you try another Linux distribution?

[juansta]

What is the USB to serial chipset used?

Im using a FTDI cable...

Can you try another Linux distribution?

I will try and spin something up (even if a live USB)...

[juansta]

Processing -U flash:w:build/MegaCore.avr.2560/src.ino.hex:i
Reading 131592 bytes for flash from input file src.ino.hex
in 1 section [0, 0x20207]: 515 pages and 248 pad bytes
Preparing flash input for device bootloader
132096 bytes in 2 sections of [0, 0x3fdff]: 516 pages and 0 pad bytes
Writing 132096 bytes to flash
Writing | ################################################## | 100% 22.87 s 
Reading | ################################################## | 100% 19.60 s 
132096 bytes of flash verified

Avrdude done.  Thank you.

I removed support for the following on my kernel:

• USB Serial Simple Driver
• Prolific 2303
• USB Debugging Device

And left only the FTDI Single Port Driver...

I will eventually need those other drivers back, but they are for other projects, so I can worry about those later...