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 <andre.przywara@arm.com>
diff --git a/plat/arm/board/arm_fpga/fpga_bl31_setup.c b/plat/arm/board/arm_fpga/fpga_bl31_setup.c
index a5f5ea0..4a529c6 100644
--- a/plat/arm/board/arm_fpga/fpga_bl31_setup.c
+++ b/plat/arm/board/arm_fpga/fpga_bl31_setup.c
@@ -144,6 +144,12 @@
panic();
}
+ /* Reserve memory used by Trusted Firmware. */
+ if (fdt_add_reserved_memory(fdt, "tf-a@80000000", BL31_BASE,
+ BL31_LIMIT - BL31_BASE)) {
+ WARN("Failed to add reserved memory node to DT\n");
+ }
+
/* Check for the command line signature. */
if (!strncmp(cmdline, "CMD:", 4)) {
int chosen;