utility chip serial communications interface
apci* at frodo?
driver supports the non-keyboard 8250-like
UART connected to the
utility chip. The first UART is used to communicate with the Domain keyboard.
The second is the serial console port when the firmware is in Domain/OS mode,
and is mapped to select code 9 by the HP-UX firmware (except on 425e models).
As such, the second UART is handled by the
driver on all
models but the 425e.
There is no tty attached to the first UART as it lacks modem/flow control and is
directly connected to the keyboard connector.
Input and output for each line may be set to one of the following baud rates:
50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, or
- apci0: silo overflow.
- The single-character input “silo” has
overflowed and incoming data has been lost.
Much of the code in the apci
driver could be shared
with the dca(4)