STM32L562 internal flash size is only 512kb,which is not sufficient for bootloader and bigger size application images.
In the TFM application delivered as part of STM32CubeL5 firmware package,the external OctaFlash can be configured to store images,but this is not implemented in ARM TF-M now.
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Hello,
Here are 2 commits to introduce the support of external flash for secondary slot
https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/7412
https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/7413
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This commit https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/7412 geometry dash subzero can help so much.