06-25-2009
So, as it turns out, the TTY and serial layers were fine.
The actual problem I'm having is with the schedule_delayed_work call.
The function tty_flip_buffer_push in drivers/char/tty_buffer.c calls flush_to_ldisc, which pushes the data to user space, if the tty->low_latency flag is set. Otherwise, it will push onto the scheduler with schedule_delayed_work. The problem here is that this delayed work is never revisited. Thus, my character input was never sent through to user space because the scheduler never called the process to do it again.
For the time being, I have hard coded it to always call flush_to_ldisc instead of the schedule_delayed_work, but this is not a fix, this is a workaround. Does anyone have any suggestions as to why this scheduling call wouldn't behave correctly?
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iscc(7) Miscellaneous Information Manual iscc(7)
NAME
iscc - serial communications interface
SYNOPSIS
controller iscc0 at isa0
DESCRIPTION
An onboard Zilog 8530 DUART provides AXPvme-based Single Board Computers with console (CON) and auxiliary (AUX) serial communications
ports. Both serial communications ports can operate at baud rates from B50 to B38400, excluding B134 (see tty(7)).
On AXPvme Single Board Computers configured with a graphics head as the system console, the CON serial communications port (/dev/tty01) is
available for use by application programs as an additional communications port.
In the absence of a graphics head, the CON serial communications port (/dev/console) becomes the system console. When used as the serial
system console, the CON serial communications port always operates at 9600 BPS, 8-bits, and no parity.
Regardless of system console, the AUX serial communications port (/dev/tty00) is always available for use by application programs.
RESTRICTIONS
Data communications equipment attached to the CON serial communications port must be set to 9600 BPS, 8-bits, no parity when configured as
the serial system console. The iscc terminal driver enforces this restriction.
No modem control is supported for either the CON or AUX serial communications ports.
FILES
console terminal local terminal local terminal
RELATED INFORMATION
console(7), devio(7), tty(7), MAKEDEV(8) delim off
iscc(7)