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