Error with setserial and multiport serial board
Ned Konz
embedded board. I'm using Linux 2.2.19, and have a Debian system.
COM1 and COM2 (/dev/ttyS0 and /dev/ttyS1) are the normal PC-ish setup, and
work fine:
/dev/ttyS0 io=0x3f8 irq=4
/dev/ttyS1 io=0x2f8 irq=3
COM3, COM4, and COM4 (/dev/ttyS2 /dev/ttyS3 /dev/ttyS4) share IRQ15, and
also provide an interrupt pending port at 0x338 in which there is a bit set
to 1 for every UART requesting service:
bit 3 = COM3
bit 2 = COM4
bit 1 = COM5
I am trying to use the following script to initialize the port setup:
setserial /dev/ttyS0 port 0x03f8 irq 4 ^fourport
setserial /dev/ttyS1 port 0x02f8 irq 3 ^fourport
setserial /dev/ttyS2 port 0x03e8 irq 15 ^fourport
setserial /dev/ttyS3 port 0x02e8 irq 15 ^fourport
setserial /dev/ttyS2 set_multiport port1 0x338 match1 7 mask1 0
But when I run the line
setserial /dev/ttyS2 set_multiport port1 0x338 match1 7 mask1 0
I get the following error message:
Cannot get multiport config: Invalid argument
The same thing happens when I go:
setserial /dev/ttyS2 get_multiport
Looking at the ioctl calls from setserial using strace, I see:
open("/dev/ttyS2", O_RDWR|O_NONBLOCK) = 4
ioctl(4, TIOCGSERIAL, 0xbffffab0) = 0
ioctl(4, TIOCSSERIAL, 0xbffffa74) = 0
ioctl(4, TIOCSERGETMULTI, 0xbffff994) = -1 EINVAL (Invalid argument)
My kernel serial configuration looks like:
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y
CONFIG_SERIAL_EXTENDED=y
CONFIG_SERIAL_MANY_PORTS=y
CONFIG_SERIAL_SHARE_IRQ=y
# CONFIG_SERIAL_DETECT_IRQ is not set
CONFIG_SERIAL_MULTIPORT=y
# CONFIG_HUB6 is not set
# CONFIG_SERIAL_NONSTANDARD is not set
I'm not passing in any serial flags on the Linux boot command line.
Can anyone shed some light on this?
Thanks in advance,
Ned Konz