In message [ref] you
wrote:

quoted

This seems ok to me but I don't have any video signal. My screen remains
blank.

What's your boot arguments? Where is  your  console  device,  on  the
serial port or on the frame buffer?

My boot arguments :
# more /proc/cmdline
console=tty0 console=ttyS1,9600 devfs=mount ip=bootp root=/dev/nfs rw

My console is on the serial port (ttyS1 on SMC2).

quoted

xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory)
...

Did you enable all of the following options in your kernel config?

	CONFIG_FB=y
	CONFIG_DUMMY_CONSOLE=y
	CONFIG_FB_MB86290=y
	CONFIG_FBCON_ADVANCED=y
	CONFIG_FBCON_CFB16=y
	CONFIG_FBCON_FONTS=y
	CONFIG_FONT_8x8=y
	CONFIG_FONT_8x16=y
	CONFIG_VT=y
	CONFIG_VT_CONSOLE=y

My guess is that CONFIG_VT and/or CONFIG_VT_CONSOLE might be missing.

All those options are enabled.