AnsweredAssumed Answered

zc702 HDMI broken after update

Question asked by StevenB on Jan 10, 2014
Latest reply on Jan 23, 2014 by StevenB

I've got a zc702 board with only the 7511 chip, and had been happily running a system with HDMI (using the cf_adv7511_zc702 reference design rev 6310ae0, and kernel rev 40d8cf29d).  I tried updating to the current revisions (reference design 5e8e14cfb and kernel d82229d2), and now HDMI doesn't work.  I rebuilt everything - reference design bitstream, FSBL, kernel + device tree, and boot image, so I don't think I have a version mismatch problem.  The bootloader and root filesystem are the same.

The system boots and I can interact with it over the serial console, but there is no HDMI output.  The /dev/fb0 device exists, and  `find /sys/bus/i2c` finds the relevant I2C handles:


There don't appear to be any significant warnings during boot, so I'm not really sure where to begin debugging.  What logs should I be looking at, and what should I be looking for?