50 lines
1.6 KiB
Plaintext
50 lines
1.6 KiB
Plaintext
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.
|