same as CFG_SYS_DDR_SDRAM_BASE for all Power SoCs. But
it could be different for ARM SoCs.
-- MIPS CPU options:
- CONFIG_XWAY_SWAP_BYTES
-
- Enable compilation of tools/xway-swap-bytes needed for Lantiq
- XWAY SoCs for booting from NOR flash. The U-Boot image needs to
- be swapped if a flash programmer is used.
-
- ARM options:
CFG_SYS_EXCEPTION_VECTORS_HIGH