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BMC console com2 on Talos II

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twenex:
Hello, I've got one of these TTL/USB serial adapters that are suggested in the wiki and am
able to get output at 115200bps 8n1 which appears to boot up the BMC.  Unfortunately I don't seem
to be able to interrupt the boot process by "pressing any key" nor able to login.  I've tried setting
and unsetting software flow control to see if I can get any input.

The cable is pretty simple, TXD/RXD and GND.  I am not using the power lead (it shouldn't be necessary).

Is there something else I should be doing?


--- Quote ---DRAM Init-V12-DDR4
0abc1-4Gb-Done
Read margin-DL:0.3470/DH:0.3470 CK (min:0.30)


U-Boot 2016.07 (Mar 17 2021 - 04:57:57 +0000)

       Watchdog enabled
DRAM:  496 MiB
Flash: 32 MiB
In:    serial
Out:   serial
Err:   serial
Net:   aspeednic#0
Hit any key to stop autoboot:  0
## Loading kernel from FIT Image at 20080000 ...
   Using 'conf@aspeed-bmc-opp-talos.dtb' configuration
...
[  OK  ] Started OpenBMC Software Update Manager.
[  OK  ] Started OpenPower Software Update Manager.
[  OK  ] Started Phosphor SNMP conf Manager.
[  OK  ] Started Phosphor Network Manager.
[  OK  ] Started Wait for /xyz/openbmc_project/state/chassis0.
[  OK  ] Started Phosphor Ldap config updater.
[   66.758448] ftgmac100 1e660000.ethernet eth0: Set package 0x0, channel 0x0 as preferred
[   66.769830] ftgmac100 1e660000.ethernet eth0: NCSI: No channel with link found, configuring channel 0

Phosphor OpenBMC (Phosphor OpenBMC Project Reference Distro) 0.1.0 talos ttyS4

talos login:

--- End quote ---

MPC7500:
Hi, did you connect it to the internal header? Also pay attention to the correct pinout (DTK/Intel compatible)?

twenex:
Yes, it is connected to the internal header on pints 3, 5 and 9 (gnd).

The part I have is from the Adafruit site which is linked on the page you've linked to.  But I'm willing to try another connector if these
do not really work.


--- Quote ---Serial Adapters for BMC TTL Auxiliary Serial Header
Adafruit USB to TTL Serial Cable - Debug / Console Cable for Raspberry Pi [5]
--- End quote ---

atomicdog:
Have you tried a different terminal program?

twenex:
I'm trying with putty and teraterm.

I did check the J7701 pinout with the wiki concerning DTK/INTEL as I noticed the header had IC style numbering rather than as pin pairs.

3: RXD
5: TXD
9: GND

On the Adafruit USB to TTL serial the color scheme is:

BLK: GND
WHT: RX
GRN: TX

Red is for +5v which I do not have hooked up.

I also tried strapping CTS to RTS thinking they may need to be looped.

Right now, I just get output when BMC boots up, but I cannot input.  Reversing TX/RX makes the output look garbled.

Voltages on the J7701 header are all zero, except 3(RX) is -5.6, 4(RTS) 6.1+ and 7(DTR) 6.1+

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