DHCOM STM32MP1 Bootloader U-Boot

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How to build U-Boot

Get sources from Github

1. Start the Console on Linux
2. git clone https://github.com/dh-electronics/u-boot-stm32mp1.git --branch dev/2021.01_dhsom
3. cd u-boot-stm32mp1

Configure and build the Device Tree + Kernel

4. ARCH=arm CROSS_COMPILE=/opt/gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- make stm32mp15_dhcom_basic_defconfig
5. ARCH=arm CROSS_COMPILE=/opt/gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf- make -j`nproc`

U-boot console commands

loady - serial load command

SPI Flash Init
loady [addr [baud]]
The loady command is used to transfer a file to the device via the serial line using the YMODEM protocol.
The number of transferred bytes is saved in environment variable filesize.
addr = load address, defaults to environment variable loadaddr or if loadaddr is not set to configuration variable CONFIG_SYS_LOAD_ADDR
baud = baud rate for the ymodem transmission. After the transmission the baud rate is reset to the original value.
In the example below the terminal emulation program picocom was used to transfer a file to the device.
After entering the loady command the key sequence <CTRL-A><CTRL-S> is used to let picocom prompt for the file name. Picocom invokes the program sz for the file transfer.
How to start picocom on your PC: picocom --baud 115200 /dev/ttyUSB0
How to exit picocom on your PC: Entering the key sequence <CTRL-A><CTRL-X>
STM32MP> loady $loadaddr 115200
## Ready for binary (ymodem) download to 0xC2000000 at 115200 bps...
*** file: Test_3444bytes.bin
$ sz -vv Test_3444bytes.bin
Sending: Test_3444bytes.bin
Bytes Sent:   3456   BPS:467                             
Ymodem sectors/kbytes sent:   0/ 0k
Transfer complete
*** exit status: 0
## Total Size      = 0x00000d74 = 3444 Bytes