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No login prompt for the serial com port

From: 杜睿哲_Pegatron
Subject: No login prompt for the serial com port
Date: Wed, 28 Jun 2017 05:41:56 +0000

Hi there,

I use grub as coreboot’s payload and successfully get the “grub>” prompt. Then 
I use following commands try to bring-up my linux kernel:

set isofile="/core-image-minimal-mohonpeak64.iso"
loopback loop (usb0,1)$isofile
linux (loop)/vmlinuz root=/dev/ram0 iso-scan/filename=${isofile} console=tty1 
console=ttyS1,115200n8  ramdisk_size=102400
initrd (loop)/initrd

The .iso image, bzImage and roofs were generated from same base using Yocto 
code building environment. The bzImage and rootfs were ok when bring up by 
uboot. Also the .iso image’s boot process (by Grub) was successful until the 
last step and before displaying login prompt, only one blinking cursor left. I 
expect it was redirected to other serial port but I don’t know how to connect 
to it. Following is my grub.cfg:

serial --unit=1 --speed=115200 --word=8 --parity=no --stop=1
terminal_input --append  serial
terminal_output --append serial

# Sample GRUB configuration file

echo 'Hello world!'
# Boot automatically after 30 secs.
set timeout=30

Is there someone that can help? Thanks.


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