rpi4: Reserve resident BL31 region from non-secure world
The GPU firmware loads the armstub8.bin (BL31) image at address 0, the beginning of DRAM. As this holds the resident PSCI code and the SMP pens, the non-secure world should better know about this, to avoid accessing memory owned by TF-A. This is particularly criticial as the Raspberry Pi 4 does not feature a secure memory controller, so overwriting code is a very real danger. Use the newly introduced function to add a node into reserved-memory node, where non-secure world can check for regions to be excluded from its mappings. Reserve the first 512KB of memory for now. We can refine this later if need be. Change-Id: I00e55e70c5c02615320d79ff35bc32b805d30770 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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@ -245,6 +245,10 @@ static void rpi4_prepare_dtb(void)
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return;
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}
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/* Reserve memory used by Trusted Firmware. */
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if (fdt_add_reserved_memory(dtb, "atf@0", 0, 0x80000))
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WARN("Failed to add reserved memory nodes to DT.\n");
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ret = fdt_pack(dtb);
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if (ret < 0)
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ERROR("Failed to pack Device Tree at %p: error %d\n", dtb, ret);
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