2021-10-15 09:10 AM
2021-10-18 01:51 AM
Hello @Rc.1 ,
the fsbl2 is a backup of the FSBL. You can find more information on the wiki page of the ROM Code: https://wiki.st.com/stm32mpu/wiki/STM32MP15_ROM_code_overview#Flash_memory_boot
For instance with a NOR flash, the NOR Flash contains two copies of FSBL. The ROM code tries to load and launch the first copy. In case of failure, it then tries to load the second copy.
This is a security for always have a board that is able to boot, even if an error occurred during the update of the first partition.
That's why your board can still run U-boot if there is nothing in the second fsbl partition.
Regards,
Kevin
2021-10-15 09:16 AM
I filled the second fsbl partition with all zeroes, u-boot still runs.
2021-10-18 01:51 AM
Hello @Rc.1 ,
the fsbl2 is a backup of the FSBL. You can find more information on the wiki page of the ROM Code: https://wiki.st.com/stm32mpu/wiki/STM32MP15_ROM_code_overview#Flash_memory_boot
For instance with a NOR flash, the NOR Flash contains two copies of FSBL. The ROM code tries to load and launch the first copy. In case of failure, it then tries to load the second copy.
This is a security for always have a board that is able to boot, even if an error occurred during the update of the first partition.
That's why your board can still run U-boot if there is nothing in the second fsbl partition.
Regards,
Kevin
2021-10-27 06:04 AM
Hi @Rc.1 ,
In order to give better visibility on the answered topics, please click on 'Select as Best' on the reply which solved your issue or answered your question. See also 'Best Answers'
Regards,
Kevin
2021-10-28 10:07 AM
Thanks Kevin, your post explains why the system still boots with only 1 FSBL.