[yocto] serial consoles

[jfabernathy]

I have the meta-cedartrail image running on hardware (Marshalltown 
board).  To make the serial console work, I have in the 
machine/cedartrail.conf file:

SERIAL_CONSOLE = "115200 ttyS0"

this works fine, but only after Linux is up and the login prompts are 
sent out. I'm trying to also get the Kernel boot console log out, and 
possibly syslinux or grub console.

If I look at the release notes for the meta-n450, it has suggestions to 
do this for that BSP as below:

         # Serial Port Setup for Intel Embedded Development Board 1-N40
         SYSLINUX_OPTS_atom-pc = "serial 0 115200"
         SERIAL_CONSOLE_atom-pc = "115200 ttyS0"
         APPEND_atom-pc = "console=ttyS0,115200 console=tty0"

However, those notes talk  about added these statements to the 
local.conf file.

I have not been able to translate what works on the n450 to cedartrail.

Any ideas?

Jim A