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- 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"
- - Samsung Galaxy Ace 2 (GT-I8160) "codina"
- 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.
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