U-Boot-for-Yukawa.md

+Flashing U-Boot for Yukawa
+==========================
+
+* With a SEI510 flashed with Amlogic U-Boot only (original board state) => [From a SEI510 flashed with Amlogic U-Boot](#from-a-sei510-flashed-with-amlogic-u-boot)
+* With a SEI510 flashed with an earlier version of Mainline U-Boot (No support for `fastboot flash bootloader`) => [From a SEI510 flashed with an earlier version of Mainline U-Boot](#from-a-sei510-flashed-with-an-earlier-version-of-mainline-u-boot)
+* With a SEI510 flashed with Mainline U-Boot (supporting `fastboot flash bootloader`) => [From a SEI510 flashed with Mainline U-Boot](#from-a-sei510-flashed-with-mainline-u-boot)
+
+From a SEI510 flashed with Amlogic U-Boot
+=========================================
+Boot using the special dongle into update mode using the Amlogic u-boot to erase the bootloader on the user and each eMMC HW boot partitions :
+```
+./usb_recovery.sh 1 BOOTLOADER/bootloader.img
+update bulkcmd "mmc dev 1"
+update bulkcmd "mmc write 0x8000000 1 0x800
+update bulkcmd "mmc dev 1 1"
+update bulkcmd "mmc write 0x8000000 1 0x800
+update bulkcmd "mmc dev 1 2"
+update bulkcmd "mmc write 0x8000000 1 0x800
+update bulkcmd "reset"
+```
+then => [When the board rebooted in USB ROM boot mode](#when-the-board-rebooted-in-usb-rom-boot-mode)
+
+From a SEI510 flashed with an earlier version of Mainline U-Boot
+================================================================
+
+From running Android:
+----------------------------
+Erase the start of user partition and the two eMMC boot* HW partitions:
+```
+adb root
+adb shell dd if=/dev/zero of=/dev/block/mmcblk2 bs=512 count=8192
+adb shell "echo 0 > /sys/block/mmcblk2boot0/force_ro"
+adb shell dd if=/dev/zero of=/dev/block/mmcblk2boot0 bs=512 count=8192
+adb shell "echo 0 > /sys/block/mmcblk2boot1`/force_ro"
+adb shell dd if=/dev/zero of=/dev/block/mmcblk2boot1 bs=512 count=8192
+adb shell sync
+adb reboot
+```
+
+From U-Boot prompt:
+--------------------------
+Erase the start of user partition and the two eMMC boot* HW partitions:
+```
+mmc dev 1
+mmc erase 0 0x2000
+mmc dev 1 1
+mmc erase 0 0x2000
+mmc dev 1 2
+mmc erase 0 0x2000
+reset
+```
+
+Or you can use the same process as with the Amlogic U-Boot flashed => [From a SEI510 flashed with Amlogic U-Boot](#from-a-sei510-flashed-with-amlogic-u-boot)
+
+When the board rebooted in USB ROM boot mode:
+---------------------------------------------
+`lsusb` should show :
+```
+Bus 001 Device 106: ID 1b8e:c003 Amlogic, Inc.
+```
+And the serial should show:
+```
+G12A:BL:0253b8:61aa2d;FEAT:E0F931...
+```
+
+Load U-Boot from USB:
+```
+update write u-boot.bin 0xfffa0000 0x10000
+update run 0xfffa0000
+update bl2_boot u-boot.bin
+```
+
+U-Boot should boot and run fastboot, then:
+```
+fastboot flash bootloader u-boot.bin
+fastboot erase bootenv
+fastboot reboot
+```
+
+From a SEI510 flashed with Mainline U-Boot
+================================================================
+
+Reboot to bootloader or press the recovery button under the device, then:
+```
+fastboot flash bootloader u-boot.bin
+fastboot erase bootenv
+```
\ No newline at end of file