arm64: support running at addr other than linked to
This is required in the case where U-Boot is typically loaded and run at
a particular address, but for some reason the RAM at that location is not
available, e.g. due to memory fragmentation loading other boot binaries or
firmware, splitting an SMP complex between various different OSs without
using e.g. the EL2 second-stage page tables to hide the memory asignments,
or due to known ECC failures.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2607fed..94ad805 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -9,6 +9,22 @@
select PHYS_64BIT
select SYS_CACHE_SHIFT_6
+if ARM64
+config POSITION_INDEPENDENT
+ bool "Generate position-independent pre-relocation code"
+ help
+ U-Boot expects to be linked to a specific hard-coded address, and to
+ be loaded to and run from that address. This option lifts that
+ restriction, thus allowing the code to be loaded to and executed
+ from almost any address. This logic relies on the relocation
+ information that is embedded into the binary to support U-Boot
+ relocating itself to the top-of-RAM later during execution.
+endif
+
+config STATIC_RELA
+ bool
+ default y if ARM64 && !POSITION_INDEPENDENT
+
config DMA_ADDR_T_64BIT
bool
default y if ARM64