fix(arm_fpga): reserve BL31 memory

Embarrassingly we never told the non-secure world that secure firmware
lives in the first few hundred KBs of DRAM, so any non-secure payload
could happily overwrite TF-A, and we couldn't even blame it.

Advertise the BL31 region in the reserved-memory DT node, so non-secure
world stays out of it.

This fixes Linux booting on FPGAs with less memory than usual.

Change-Id: I7fbe7d42c0b251c0ccc43d7c50ca902013d152ec
Signed-off-by: Andre Przywara <>
1 file changed