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Simon Glass 401d1c4f5d common: Drop asm/global_data.h from common header 
Move this out of the common header and include it only where needed.  In
a number of cases this requires adding "struct udevice;" to avoid adding
another large header or in other cases replacing / adding missing header
files that had been pulled in, very indirectly.   Finally, we have a few
cases where we did not need to include <asm/global_data.h> at all, so
remove that include.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
2021-02-02 15:33:42 -05:00
..
Kconfig board: Add new Samsung "stemmy" board based on ST-Ericsson U8500 2020-01-22 17:47:57 -05:00
MAINTAINERS board: Add new Samsung "stemmy" board based on ST-Ericsson U8500 2020-01-22 17:47:57 -05:00
Makefile board: Add new Samsung "stemmy" board based on ST-Ericsson U8500 2020-01-22 17:47:57 -05:00
README board: Add new Samsung "stemmy" board based on ST-Ericsson U8500 2020-01-22 17:47:57 -05:00
stemmy.c common: Drop asm/global_data.h from common header 2021-02-02 15:33:42 -05:00

README 

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.