HiKey: Add recovery target and instructions

To make it a bit easier to understand how to do a recovery and how to
flash HiKey, we have added a new make target for recovery which tells
how to configure the jumpers and the initiates the recovery itself. In
addition to this we have changed the "flash" make target so that it
does the same as stated in the instructions on the 96boards "Getting
started" page.

Signed-off-by: Joakim Bech <joakim.bech@linaro.org>
Tested-by: Joakim Bech <joakim.bech@linaro.org> (HiKey)
Reviewed-by: Victor Chong <victor.chong@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>

hikey.mk

@@ -420,9 +420,32 @@ nvme-cleaner:
 ################################################################################
 # Flash
 ################################################################################
+define flash_help
+	@read -r -p "1. Connect USB OTG cable, the micro USB cable (press any key)" dummy
+	@read -r -p "2. Connect HiKey to power up (press any key)" dummy
+endef
+
+.PHONY: recovery
+recovery:
+	@echo "Enter recovery mode to flash a new bootloader"
+	@echo "Jumper 1-2: Closed (Auto power up = Boot up when power is applied)"
+	@echo "       3-4: Closed (Boot Select = Recovery: program eMMC from USB OTG)"
+	$(call flash_help)
+	sudo python $(ROOT)/burn-boot/hisi-idt.py --img1=$(LLOADER_PATH)/l-loader.bin
+	@$(MAKE) --no-print flash FROM_RECOVERY=1
+
 .PHONY: flash
 flash:
-	sudo python $(ROOT)/burn-boot/hisi-idt.py --img1=$(LLOADER_PATH)/l-loader.bin
+ifneq ($(FROM_RECOVERY),1)
+	@echo "Flash binaries using fastboot"
+	@echo "Jumper 1-2: Closed (Auto power up = Boot up when power is applied)"
+	@echo "       3-4: Open   (Boot Select = Boot from eMMC)"
+	@echo "       5-6: Closed (GPIO3-1 = Low: UEFI runs Fastboot app)"
+	$(call flash_help)
+	@echo "3. Wait until you see the (UART) message"
+	@echo "    \"Android Fastboot mode - version x.x Press any key to quit.\""
+	@read -r -p "   Then press any key to continue flashing" dummy
+endif
 	fastboot flash ptable $(LLOADER_PATH)/ptable-linux-4g.img
 	fastboot flash fastboot $(ARM_TF_PATH)/build/hikey/$(ARM_TF_BUILD)/fip.bin
 	fastboot flash nvme $(NVME_IMG)