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According to AN4221, the i2c bootloaders starting from version 1.2 support "No-Stretch Get Memory Checksum" command. However, I simply cannot find that command implementation or handling in the files modules/i2c/openbl_i2c.cmd.h or modules/i2c/openbl_i2c.cmd.h

Hello,

could you please explain why in the file spi_interface.c some functions are placed in the RAM ?
For exaple:
#if defined (ICCARM)
__ramfunc void OPENBL_SPI_SendByte(uint8_t Byte)
#else
attribute((section(".ramfunc"))) void OPENBL_SPI_SendByte(uint8_t Byte)
#endif /* (ICCARM) */

Thank you for your help.
Regards,
Marco

I learned that OPenbootloader has been updated and has reached the 6th version. When I opened STM32CubeU5, I found that OPENBL_RAM_SIZE is 90kBytes. Is there any detailed document to explain how to cut this BootLoader, because chips with small resources cannot use this bootloader at all

Support for the High Speed USB interface?

Currently using the STM32H743I-EVAL2 board and would like to use the openbl on the high speed usb interface instead of the full speed usb port.

Developing in the STM32CUBE IDE.

According to the content described in the readme, openbl should be a bootloader compatible with all stm32 chips. However, when I transplanted openbl to stm32f1 following the program of stm32u5, there were a lot of errors. The flash_interface should be a file compatible with all devices. , but now there are so many errors I don't know how to fix it