Hi all,

I have pushed for review a change to improve the TF-M linker scripts / scatter files: https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/30316

There are two ideas behind the change:

• Merge the isolation level 3 features from the tfm_isolation_l3 linker files into tfm_common_s, so that one linker file can support all TF-M isolation levels.
• Group the memory by its desired memory protection attribute as far as possible, so that as much of the memory map as possible can be covered by MPU regions to restrict the attributes to no more than needed. The main advantage of this is to reduce how much of the memory is executable.

There are more details in the commit message.

Since it could be a disruptive change, the new linker files are added in addition to the existing tfm_common_s.sct/ld/icf and tfm_isolation_l3.sct/ld/icf ones and only platforms that are already using the common tfm_hal_isolation_v8m.c are switched over for now. But the idea is that platforms can gradually migrate and eventually the existing linker files can be removed.

Kind regards,

Jamie