[PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx
Sebastian Andrzej Siewior
bigeasy at linutronix.de
Mon Sep 29 09:15:05 PDT 2014
* Peter Hurley | 2014-09-17 08:20:41 [-0400]:
>> So I connected my am335x-evm
>> with beagle board xm because both of them have an old fashion UART
>> connector (instead those uart-to-usb). Both configured with HW-Flow and
>> I haven't seen the function invoked but I saw "port->icount.overrun"
>> being incremented. This shouldn't happen. So I am a little puzzled here…
>Yeah, that's weird. Do you have a break-out box to confirm that RTS/CTS are
- beagle board
According to schematics the board has only RX and TX connected. No
The schematics say "DNI" next to a resistor on RTS/CTS. DNI stands
most likely for "Do Not Install". With a scope it looks like the the
wire behind the MAX is open.
- beagle bone black
Only RX and TX are wired towards the USB2serial device.
In short: each device I have has RTS/CTS not working/connected and I
can't test HW handshake with HW available.
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