ahmet alper parker wrote:
I have a usb to serial device,
That is not useful for a target board without serial port. Please read http://www.coreboot.org/EHCI_Debug_Port (Maybe you already found it when searching for info on debug device?)
which steps do I need to follow? Is there a link?
No, there is no link. You must spend a lot of time learning to do it yourself. You can get help from the coreboot community but then you must ask very specific and detailed questions when you encounter a problem.
//Peter