[coreboot] it8712f com1

Peter Stuge peter at stuge.se
Sun Oct 12 19:49:09 CEST 2008

ron minnich wrote:
> there is an it8712f com1 on this board I have. superiotool says this:
> LDN 0x01 (COM1)
> idx 30 60 61 70 f0 f1 f2 f3
> val 01 03 f8 04 00 50 00 7f
> def 00 03 f8 04 00 50 00 7f
> linux says this:
> serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> 00:05: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> setserial says this:
> sudo setserial /dev/ttyS0
> [sudo] password for rminnich:
> /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
> minicom is happy. I just can't talk to it. I figure I ought to be able
> to short pins 2,3 and at least get loopback. No good.

Check that minicom is set up for no flow control. Also check if you
get interrupts when sending some keystrokes across the loopback.

> Connection is to a 10 pin header on the board. I've got nice clips
> shorting things together on that header and ... no good.

Should work.

> My mental toolbox is running empty. Any ideas? Is this chip so
> benighted that it actually demands modem control signals (null
> modem is somewhere else but I guess I can start twisting wires
> together).

Shouldn't be needed, unless flow control is enabled..

> Anybody got a handy dandy 'short wires logically' program lying
> around? I am running out of time ....

What would that program do? Sorry, don't understand.


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