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diff --git a/board/ste/stemmy/README b/board/ste/stemmy/README new file mode 100644 index 0000000000..81f72426f2 --- /dev/null +++ b/board/ste/stemmy/README @@ -0,0 +1,49 @@ +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. |