USB serial comms in piCore 11

[jefferee]

Looks like the USB serial kernel module has yest to be added as a piCore 11 extension... I would see something like

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usb-serial-4.19.81-piCore-v7.tcz
in the list if it were there, correct?

Will it be added to tcz at some point?

Thanks...

[Rich]

Hi jefferee
Go here:
http://www.tinycorelinux.net/11.x/armv7/releases/RPi/src/kernel/
and download  modules.tar.gz.

Then execute this:

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tar xf modules.tar.gz
cd modules/lib/modules/4.19.81-piCore-v7/kernel/drivers/usb/serial/
You should find all the modules in that subdirectory.

[Juanito]

posted - thanks for reporting that

[jefferee]

Thanks, Juanito.

What's the standard piCore utility for serial terminal from command line?
I've normally used Minicom but it's not (yet) compiled for piCore 11. Not stuck on Minicom in particular if there's already a different extension available.

[jefferee]

Looks like the 4.19.81 kernel version of dwc_otg is having some issues with my (ab)-use of a 16 port USB RS-232 serial adapter (including 3 hubs inside the unit there are 19 USB devices, total).

Plugging in the adapter is crashing the USB bus but I did manage to get it to spit out a dmesg with the error report

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ERROR::assign_and_init_hc:1408: assign_and_init_hc: Failed to allocate memory to handle non-dword aligned buffer case
My Pi 3B with piCore 9.0.3 is fine, but piCore 11.0 crashes when connected to the adapter, on both a 3B and 3B+.

A 2-channel USB/RS232 adapter appears to work properly in piCore 11 so it's possible that the 4.19 kernel might limit the number of endpoints in a way previous kernels didn't...

[Paul_123]

Have you tried changing the FIQ modes?   USB on a RPI is pretty sketchy.

Better yet, move to a PI4.

[jefferee]

Have you tried changing the FIQ modes?   USB on a RPI is pretty sketchy.

Better yet, move to a PI4.

I have not tried changing FIQ (or anything else in the kernel config).
Is there documentation somewhere of what the options are? I'm coming up empty on Google searches.

Thanks,
-Jeff.

[Juanito]

There's a possible patch at the end of this link?

https://patchwork.kernel.org/patch/10374827/

[Paul_123]

For whatever reason, the base piCore images do not enable FIQ accellerations withing dwg_otc.  Which is fine if you don't have USB devices connected.  Without FIQ handling, its common to see lost/corrupted USB data.   I'm far from a USB expert, but I would start with

Adding

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dwc_otg.fiq_fsm_mask=0xFto your cmdline.txt file on your boot drive.  There is of coarse different options for FIQ, but this enables all of the accelerations.

Other If that doesn't work, there might be other options.

[Juanito]

minicom added to the repo