(ARCHIVED) Ubuntu Xenial Image (BSP Kernel)

[Pirin]

just booted my p64  with the 'disp.screen0_output_mode=EDID'  cmd line/

on my DELL U2410, i get no video by default.    by using that cmdline flag, i get working video. :-)

(this doesn't help my little 7" screen, though - it's not supporting the resolution, i'm sure)

Pardon my linux ignorance, but would you mind sharing how you added this flag?  I tried to modify the /proc/cmdline file, but I cannot.  I then created a /root/cmdline file with the appropriate content, and tried to use a bind mount, but that change didn't persist after a reboot.

Thanks

The contents of /proc/cmdline are read-only and come from the actual arguments passed to the kernel by the boot loader. To change the kernel arguments, you have to change a file that's read by uboot off of the first partition on the SD card.  It should be in /boot/uEnv.txt; if /dev/mmcblk0p1 isn't mounted on /boot, you'll have to mount it first to get at uEnv.txt.

Awesome!  Thank you for the pointer.  I modified uEnv.txt to append 'disp.screen0_output_mode=EDID' to the end of the first line.  After rebooting, 'cat /proc/cmdline' showed that the disp parameter was indeed loaded.  Unfortunately, I still get no signal output to my monitor via the DVI cable Oh well.  At least I know how to add kernel parameters.    Thanks again.