[coreboot] Can WinDbg debug Windows graphic driver?

[WANG Siyuan]

Hi, everyone
My coreboot can boot Windows 7 with VGA driver but cannot boot Windows
7 with AMD driver. The monitor is black but system is still alive. I
can connect it by Remote Desktop. There is no dump files generated.
I try to use WinDbg to debug. Now, I know how to debug a process and
setup a server-client environment, But how to debug Graphic Driver
without source code?
Thank you!