uEnv.txt/fat32 sample for RAM disk run initram ROOT with uImage

By default Uboot/tf boot in ARM/Linux

mmcroot=/dev/mmcblk0p2 rw

Without modification of Uboot, change its setting by uEnv.txt

Example

mmcroot="/dev/ram0   rdinit=/linuxrc"

dispmode=

mmcargs=setenv bootargs console=${console}   root=${mmcroot} rootfstype=${mmcrootfstype} ip=none