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iMX6Q : Yocto and HDMI support

Question asked by Milo Tenzin on Mar 9, 2015
Latest reply on Apr 24, 2015 by Eugene Volkov

I have a Freescale sabre, for which I have generate core-image-x11 with yocto. Booting and using it with serial port is ok, but I can't use the HDMI display. The HDMI is detected by u-boot (I an see two tux on the hdmi display), but not after. Here are some informations given by u-boot :

U-Boot 2014.10+fslc+g5fd0b60 (Feb 27 2015 - 11:26:20) CPU: Freescale i.MX6Q rev1.2 at 792 MHz Reset cause: POR Board: MX6-SabreSD I2C: ready DRAM: 1 GiB MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2 auto-detected panel HDMI Display: HDMI (1024x768) In: serial Out: serial Err: serial PMIC: PFUZE100 ID=0x10 Net: FEC [PRIME] 

I have tried this in u-boot :

setenv mmcargs 'setenv bootargs console=ttymxc0,115200 root=/dev/mmcblk0p2 rootwait rw video=mxcfb0' 

But it doesn't change anything, even if the modification can be seen in /proc/cmdline after the booting ; and

setenv mmcargs 'setenv bootargs console=ttymxc0,115200 root=/dev/mmcblk0p2 rootwait rw video=mxcfb0:dev=hdmi' 

makes the booting stopping at starting kernel.
Does anyone know how to support hdmi ?

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