1These instructions will help you flashing the prebuilt bootloader 2and AOSP images(built from sources) on db845c. 3 4First, you wil need to have first built AOSP for the 5db845c-userdebug lunch target. 6 7 8Boot the board into fastboot mode: 9---------------------------------- 10The easiest way to boot into fastboot mode is to run something 11like "adb reboot bootloader" from the host, or 12"reboot bootloader" on the device. However, this 13functionality may depend on the software installed on the board 14to work, so you may need to manually enter fastboot mode as 15follows. 16 17 18To manually enter fastboot mode: 19-------------------------------- 20* To manually boot the board into fastboot mode, press DOWN arrow 21 key over serial UART console when restarting the board. 22 23 OR 24 25* Disconnect the power *and* USB-C cable. Flip the board over, and 26 while holding down the "VOL-" button plug in the power cable. 27 Continue holding down the "VOL-" button and tap the "ON/OFF" 28 button. The board should then boot to fastboot mode. Be sure to 29 then re-connect the USB-C cable so that you can flash the board. 30 31If HDMI is plugged in, you should see a text based 32"FastBoot Mode" prompt on your screen. Or you can check by running 33"fastboot devices" on your host which will print something like: 34 35 $ fastboot devices 36 c4e1189c fastboot 37 38 39Flash the board: 40---------------- 41Once the board is in fastboot mode, you can then flash bootloader 42binaries and AOSP images by running the following script from 43device/linaro/dragonboard/installer/db845c/ directory: 44 45 $ ./flash-all-aosp.sh 46 47 48Troubleshooting: 49---------------- 50* Make sure the USB-C cable is connected. As it has to be 51 removed to fully power the device down, it is easy to forget 52 to reconnect it! 53 54* If you cannot get the board into fastboot mode, or for some 55 reason the flash-all-aosp.sh script does not work, you can do 56 a full recovery flash of the board using the following 57 instructions. 58 59 60Recovery: 61-------- 62First boot into recovery mode. After removing the power cable 63and the USB-C cable, connect power while holding the "USB" 64button (next to volume buttons near the USB-A ports). While 65continuing to hold down the "USB" button, tap the "ON/OFF" 66button. Then re-connect USB-C cable. There will be no HDMI 67display output in recovery mode, and initially no serial output. 68 69Then run the recovery script from the 70device/linaro/dragonboard/installer/db845c/ directory: 71 72 $ ./recovery.sh 73 74This will do a recovery flash of the ptable and bootloader 75binaries. After it is finished, the board will reboot. 76 77Depending on the state of the board, it will enter fastboot 78or may boot to a previously installed kernel. At that point 79you may start again from the top of this document. 80