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From: Eli Cohen <echoline@gmail.com>
Date: Thu, 30 Jul 2020 14:18:47 -0700
Message-ID: <CAHwi9bzvPoO-nqiTHetBO+CcRf40C5XVSm3DOrv=FbC-xZSyMg@mail.gmail.com>
Subject: CDC ACM nusb/serial driver
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--00000000000070372105abaf3803
Content-Type: text/plain; charset="UTF-8"

I've cleaned up this driver to closely reflect the OpenBSD umodem
driver and address the issue of changing serial.c in a cleaner way.

cinap, we talked about having to support multiple serial interfaces on
one device, from the looks of it the OpenBSD driver may actually *not*
support this. this patch attempts to do so, but I have no such devices
to test it with...

the nusb/serial driver still needs work. I'm mounting 9p over the
serial port and it's flaky, it eventually screws up. I also did this
with an FTDI device and that was flaky too, before I made any changes.
I'm not sure what's going on, in kprint I see 9p errors when it screws
up... dropped data maybe...?

the devices I'm working with, Arduino Megas, work pretty well with
nusb/serial, both FTDI and with this patch CDC ACM devices, but like I
said above, I have no other devices to test this with

--00000000000070372105abaf3803
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