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Embedded flash also has a user signature area. This is a 512 bytes large page whose data are not erased by asserting ERASE pin or by software ERASE command. It may be used to store configuration, keys, trimming values etc. This commit adds option to access this area from OpenOCD. Change-Id: If870aa85938b9cccd94f958dd1f3d93dbdf779f0 Signed-off-by: Michal Lenc <michallenc@seznam.cz> Reviewed-on: https://review.openocd.org/c/openocd/+/8302 Reviewed-by: Tomas Vanek <vanekt@fbl.cz> Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com> Tested-by: jenkins