[OpenIndiana-discuss] Setup serial console on ttyc (the third serial port)

Andrew Gabriel illumos at cucumber.demon.co.uk
Wed Mar 2 20:50:33 UTC 2011

I suspect it would be very easy to fix this in the kernel.
I fixed the missing bits in the asy(7D) driver 7 or 8 years ago when I 
was adding 16650/16750 support. I think all that's left to fix is adding 
ttyc and ttyd support to usr/src/uts/i86pc/io/consplat.c 

The other bit that was outstanding at that time was the Device 
Configuration Assistant (DCA), which was a complete swine to build. 
However, that vanished in Solaris 10 Update 1, being replaced by grub 
and some device enumeration support in the kernel, and I would guess 
grub probably does support com3 and com4.

wessels wrote:
> ough, that's a real bummer and waste of time. This restriction is not
> very well documented. Everybody talked about ttya and ttyb but no ever
> mentioned that other ports are not supported apart from usb-serial.
> Now I've to figure out how the ports will get reshuffled if I change
> the SOL port from com3 to com2. Both com1 and com2 are in use. I
> wonder what's going to happen to them... If I get this working, that's
> all three ports, I'll put up a page on the wiki.
> Thanks for the notice sofar. Anything else I should worry about?
> On Wed, Mar 2, 2011 at 7:44 PM, Andrew Gabriel
> <illumos at cucumber.demon.co.uk> wrote:
>> wessels wrote:
>>> Perhaps all described procedures work on ttya but I can't get a console on
>>> ttyc.
>>> ttyc (the third serial port) is a SerialOverLan port
>> Sorry, but the kernel only recognizes ttya and ttyb (and usb-serial) as
>> console= values, not ttyc.
>> It's been a very long missing feature on Solaris x86, but became less
>> important as the number of motherboard serial ports has reduced over the
>> years, and ISA-bus serial cards became unusable (no ISA-bus slots anymore).
>> Can you disable ttya (com1) in the BIOS, and then reconfigure ttyc (com3) to
>> have the i/o address and irq which were associated with com1, so it looks
>> like com1 (ttya) to the OS? (IIRC, 0x3f8 and IRQ 4)
>> --
>> Andrew


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