if ARM64 config ARMV8_MULTIENTRY bool "Enable multiple CPUs to enter into U-Boot" config ARMV8_SPIN_TABLE bool "Support spin-table enable method" depends on ARMV8_MULTIENTRY && OF_LIBFDT help Say Y here to support "spin-table" enable method for booting Linux. To use this feature, you must do: - Specify enable-method = "spin-table" in each CPU node in the Device Tree you are using to boot the kernel - Let secondary CPUs in U-Boot (in a board specific manner) before the master CPU jumps to the kernel U-Boot automatically does: - Set "cpu-release-addr" property of each CPU node (overwrites it if already exists). - Reserve the code for the spin-table and the release address via a /memreserve/ region in the Device Tree. endif