I have the NXP-recommended hdmi adapter board connected to the parallel lcd connector on the imx6sxsabresd eval board. After the OS boots up, I get the matchbox desktop displaying fine on my monitor. However, in u-boot, after changing the "panel" environment variable to MCIMX28LCD (this is the name of the parallel LCD display entity in the mx6sxsabresd.c board file), I don't get anything on my monitor. On other boards, u-boot always shows something, such as the small NXP logo and the u-boot version. I tried loading a bitmap into memory and displaying it, but nothing happens, though i know the bmp is loaded correctly. I'm doing all this straight from the yocto-built sd card image. I'm sure the issue is somewhere in the u-boot settings, but I don't know what to change. I don't have an LVDS display to try out the default display settings, so this is my only option.