By default Linux BSP will work with LVDS screen on i.MX 6SoloX SABRE board.
To enable MCIMX28LCD on the board, following need to be modified in u-boot:
setenv panel 'MCIMX28LCD'
setenv fdt_file 'imx6sx-sdb-lcdif1.dtb'
#add video=mxc_lcdif:SEIKO-WVGA,bpp=16 to kernel command line you’re using
#For example, when booting from MMC it will be:
# setenv mmcargs 'setenv bootargs console=${console},${baudrate} root=${mmcroot} video=mxc_lcdif:SEIKO-WVGA,bpp=16'
saveenv