Now that PIE works when U-Boot is started from ROM, let's enable CONFIG_POSITION_INDEPENDENT, which allows to load U-Boot also via ARM Trusted-Firmware's fip.bin to DRAM, without tweaking the configuration.
To get a writable initial stack, we need to keep the fixed initial stack pointer, which points to DRAM in our case.
Signed-off-by: Andre Przywara andre.przywara@arm.com Reviewed-by: Stephen Warren swarren@nvidia.com --- arch/arm/Kconfig | 1 + configs/qemu_arm64_defconfig | 1 + 2 files changed, 2 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 5ffa84c1d98..8ba73680699 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -22,6 +22,7 @@ config POSITION_INDEPENDENT
config INIT_SP_RELATIVE bool "Specify the early stack pointer relative to the .bss section" + default n if ARCH_QEMU default y if POSITION_INDEPENDENT help U-Boot typically uses a hard-coded value for the stack pointer diff --git a/configs/qemu_arm64_defconfig b/configs/qemu_arm64_defconfig index 31ea2d342fc..4450e7ced42 100644 --- a/configs/qemu_arm64_defconfig +++ b/configs/qemu_arm64_defconfig @@ -1,6 +1,7 @@ CONFIG_ARM=y CONFIG_ARCH_QEMU=y CONFIG_NR_DRAM_BANKS=1 +CONFIG_POSITION_INDEPENDENT=y CONFIG_ENV_SIZE=0x40000 CONFIG_ENV_SECT_SIZE=0x40000 CONFIG_AHCI=y