tegra: image: make bootscript standalone

Don't hard-code the PTUUID, use U-Boot commands to determine it, as some
partitioning tools could rewrite PTUUID when modifying partitions.

Signed-off-by: Tomasz Maciej Nowak <[email protected]>

target/linux/tegra/image/Makefile

@@ -14,10 +14,7 @@ define Build/tegra-sdcard
 	$(if $(DEVICE_DTS),\
 		$(foreach dtb,$(DEVICE_DTS),$(CP) $(DTS_DIR)/$(dtb).dtb [email protected]), \
 		$(CP) $(DTS_DIR)/*.dtb [email protected])
-	sed \
-		-e 's#@ROOT@#$(IMG_PART_SIGNATURE)#g' \
-		-e 's#@KERNEL@#$(KERNEL_NAME)#g' \
-		$(BOOT_SCRIPT) > [email protected]
+	sed -e 's#@KERNEL@#$(KERNEL_NAME)#g' $(BOOT_SCRIPT) > [email protected]
 	mkimage -A arm -O linux -T script -C none -a 0 -e 0 \
 		-n '$(DEVICE_TITLE) OpenWrt bootscript' \
 		-d [email protected] \

target/linux/tegra/image/generic-bootscript

@@ -1,4 +1,6 @@
-setenv bootargs "root=PARTUUID=@ROOT@-02 rw rootwait console=ttyS0,115200 console=tty0"
+part uuid ${devtype} ${devnum}:2 ptuuid
+
+setenv bootargs "root=PARTUUID=${ptuuid} rw rootwait console=ttyS0,115200 console=tty0"
 
 load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} /@KERNEL@
 load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} /${soc}-${board}.dtb