| ST-Ericsson U8500 Samsung "stemmy" board |
| ======================================== |
| |
| The "stemmy" board supports Samsung smartphones released with |
| the ST-Ericsson NovaThor U8500 SoC, e.g. |
| |
| - Samsung Galaxy S III mini (GT-I8190) "golden" |
| - Samsung Galaxy S Advance (GT-I9070) "janice" |
| - Samsung Galaxy Xcover 2 (GT-S7710) "skomer" |
| |
| and likely others as well (untested). |
| |
| At the moment, U-Boot is intended to be chain-loaded from |
| the original Samsung bootloader, not replacing it entirely. |
| |
| Installation |
| ------------ |
| |
| 1. Setup cross compiler, e.g. export CROSS_COMPILE=arm-none-eabi- |
| 2. make stemmy_defconfig |
| 3. make |
| |
| For newer devices (golden and skomer), the U-Boot binary has to be packed into |
| an Android boot image. janice boots the raw U-Boot binary from the boot partition. |
| |
| 4. Obtain mkbootimg, e.g. https://android.googlesource.com/platform/system/core/+/refs/tags/android-7.1.2_r37/mkbootimg/mkbootimg |
| 5. mkbootimg \ |
| --kernel=u-boot.bin \ |
| --base=0x00000000 \ |
| --kernel_offset=0x00100000 \ |
| --ramdisk_offset=0x02000000 \ |
| --tags_offset=0x00000100 \ |
| --output=u-boot.img |
| |
| 6. Enter Samsung download mode (press Power + Home + Volume Down) |
| 7. Flash U-Boot image to Android boot partition using Heimdall: |
| https://gitlab.com/BenjaminDobell/Heimdall |
| |
| heimdall flash --Kernel u-boot.(bin|img) |
| |
| 8. After reboot U-Boot prompt should appear via UART. |
| |
| UART |
| ---- |
| |
| UART is available through the micro USB port, similar to the Carkit standard. |
| With a ~619kOhm resistor between ID and GND, 1.8V RX/TX is available at D+/D-. |
| |
| Make sure to connect the UART cable *before* turning on the phone. |