DHCOM STM32MP1 Bootloader U-Boot
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How to build U-Boot
Get sources from Github
Configure and build the Device Tree + Kernel
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U-boot console commands
loady - serial load command
- SPI Flash Init
loady [addr [baud]]
- Description:
- 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_ADDRbaud
= baud rate for the ymodem transmission. After the transmission the baud rate is reset to the original value.
- Example:
- 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... CC *** file: Test_3444bytes.bin $ sz -vv Test_3444bytes.bin Sending: Test_3444bytes.bin Bytes Sent: 3456 BPS:467 Sending: Ymodem sectors/kbytes sent: 0/ 0k Transfer complete *** exit status: 0 ## Total Size = 0x00000d74 = 3444 Bytes STM32MP>