imx6ul LCD无法显示

烧写官方uboot和kernel提供的源码，编译出来后LCD无法显示
# dmesg | grep lcd
device-tree: Duplicate name in lcdif@021c8000, renamed to "display#1"
21c8000.lcdif supply lcd not found, using dummy regulator
mxsfb 21c8000.lcdif: allocated fb @ paddr=0x88000000, size=33554432.
mxsfb 21c8000.lcdif: failed to find mxc display driver
mxsfb 21c8000.lcdif: mxsfb_set_par
mxsfb 21c8000.lcdif: Setting up RGB888/666 mode
mxsfb 21c8000.lcdif: mxsfb_enable_controller
mxsfb 21c8000.lcdif: mxsfb busfreq high request.
mxsfb 21c8000.lcdif: mxsfb_set_par
mxsfb 21c8000.lcdif: mxsfb_disable_controller
mxsfb 21c8000.lcdif: Setting up RGB888/666 mode
mxsfb 21c8000.lcdif: mxsfb_enable_controller
mxsfb 21c8000.lcdif: initialized
imx6ul-pinctrl 20e0000.iomuxc: pin MX6UL_PAD_GPIO1_IO01 already requested by 21c8000.lcdif; cannot claim for 2040000.tsc