AMT console (was: Fixing suspend/resume on Lenovo x220)

[Bengt Ahlgren]

John Baldwin <jhb at freebsd.org> writes:

> On Thursday, June 13, 2013 10:00:21 am Ganael LAPLANCHE wrote:
>> Hi,
>> 
>> As you may know, suspend/resume has been broken on Lenovo x220 for a
>> long time now, see :
>> 
>> http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/174504
>> 
>> I have been able to do a suspend(S3)/resume operation in text mode (it
>> works, but console stays dark at resume, I had to connect through ssh ;
>> also, resume hangs if X is started with i915kms.ko loaded) and collect
>> the following verbose logs :
>
> Interesting, I connected a serial console via AMT but wasn't able to get
> any output during resume.  Is this with a stock kernel?

Does the console via AMT otherwise work for you?

I'm trying to set up AMT as the console on a TP X201.  I got the serial
over LAN working using amtterm from another machine - verified with cu
on the tty (ttyu2) that typing on both ends shows up at the other end
before trying console redirection.  The device is:

uart2: <Non-standard ns8250 class UART with FIFOs> port 0x1808-0x180f mem 0xf2524000-0xf2524fff irq 17 at device 22.3 on pci0

uart2 at pci0:0:22:3:	class=0x070002 card=0x216217aa chip=0x3b678086 rev=0x06 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '5 Series/3400 Series Chipset KT Controller'
    class      = simple comms
    subclass   = UART
    bar   [10] = type I/O Port, range 32, base 0x1808, size  8, enabled
    bar   [14] = type Memory, range 32, base 0xf2524000, size 4096, enabled
    cap 01[c8] = powerspec 3  supports D0 D3  current D0
    cap 05[d0] = MSI supports 1 message, 64 bit 

I've set:

hint.uart.2.flags="0x10"
console="comconsole"

in /boot/loader.conf, but the loader just hangs after printing:

Loading /boot/defaults/loader.conf

Any advice?  Is uart2 unusable as a console?  It does not say "flags
0x10" in the device probe - does that mean it won't work?

Bengt