I got the schematics now and I see that J9B4 is connected to Embedded
Controller (EC), so I think that this is not 8250 UART2. Am I right?
I am not able to find the documentation what purpose is served by Embedded
Controller and does coreboot use it at all? Any pointers please. I am
trying to understand what is the purpose of COM port at J9B4. Any specific
document that I should refer to to understand it? I checked user guide and
There are 2 com ports I see using usb to serial and Port0 is used for
console. Is another port on usb to serial is spare and can be used for
console or is it serving some other purpose in coreboot.
On Fri, Nov 7, 2014 at 3:51 PM, Gailu Singh <gailu96(a)gmail.com> wrote:
I have working console uart 0 on Baytrail CRB board. However I am trying
to change to uart 2 (J9B4) DB9 connector. I have changed
CONFIG_UART_FOR_CONSOLE=2 from menuconfig, cleaned and rebuild and flashed
coreboot but do not see any log on port 2. Is there any other changes
required apart from CONFIG_UART_FOR_CONSOLE ?