The embedded BootLoader of STM32L452RE works abnormally

[chaoyu chen]

Hello Guys,

I am working on the L452RE_NUCLEO board and testing its embedded bootloader. The purpose is to implement flash updating feature, and therefore Flash-loader demonstrator (UM0462) is my test tool.

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However I found L452RE_NUCLEO's bootloader cannot work well like other boards, such as stm32f0discovery. The following are some phenomenons I got:

1. it is hard to connect to the bootloader via uart. I have to reset (i.e., power on/off) the board many times, but a successful connection once with Flash-loader demonstrator.
2. After connected by Flash-loader demonstrator, there is no flash information on the screen. Normally I should see the flash information and can read/write the flash, but I can do nothing at all. The image attached is what I got.

Please help on this. Thanks a lot!

update:

I Just found another issue here: https://community.st.com/s/question/0D50X00009XkYERSA3/problems-using-the-internal-bootloader-with-an-stm32f7.

However its solution doesn't help. I have downloaded the newer tool, STMFlashLoader Demo_V2.9.0RC4.zip : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HyZb&d=%2Fa%2F0X0000000bB9%2FYFV_iSjUbmd5ku0V_1q_jaaH4yU3v6lHbqGRs2VZofA&asPdf=false

but got the same result.

[chaoyu chen]

Hello,

Just tried another new tool STM32CubeProg (https://www.st.com/en/development-tools/stm32cubeprog.html) . It also cannot work with L452RE_NUCLEO, but works fine with stm32f0discovery.

Please help!