setenv bootargs ${bootargs} bootfromext
if fatload mmc 0 ${loadaddr} kernel.img; then if fatload mmc 0 ${dtb_mem_addr} dtb.img; then bootm ${loadaddr}; else store dtb read ${dtb_mem_addr}; bootm ${loadaddr}; fi; fi;
if fatload usb 0 ${loadaddr} kernel.img; then if fatload usb 0 ${dtb_mem_addr} dtb.img; then bootm ${loadaddr}; else store dtb read ${dtb_mem_addr}; bootm ${loadaddr}; fi; fi;
if fatload usb 1 ${loadaddr} kernel.img; then if fatload usb 1 ${dtb_mem_addr} dtb.img; then bootm ${loadaddr}; else store dtb read ${dtb_mem_addr}; bootm ${loadaddr}; fi; fi;
if fatload usb 2 ${loadaddr} kernel.img; then if fatload usb 2 ${dtb_mem_addr} dtb.img; then bootm ${loadaddr}; else store dtb read ${dtb_mem_addr}; bootm ${loadaddr}; fi; fi;
if fatload usb 3 ${loadaddr} kernel.img; then if fatload usb 3 ${dtb_mem_addr} dtb.img; then bootm ${loadaddr}; else store dtb read ${dtb_mem_addr}; bootm ${loadaddr}; fi; fi;