nanogui@linuxhacker.org

: I found that the select_driver()(drivers/fb.c) function returned null
: because the input screen type is 4 which is not equal to
FB_TYPE_PACKED_PIXELS(0).
: Could you tell me which file defined FB_TYPE_PACKED_PIXELS and why it is
defined to be 0?

The value 4 is FB_TYPE_VGA_PLANES, which is returned
when you are running the basic 4-planes 16 color VGA
driver.  This driver doesn't support packed pixels.
The scr_fb.c file defines this constant, and the
config file FBVGA=Y option must be set in order to
include this subdriver.  That's probably your problem.

Regards,

Greg