123b5877cSLinus Walleijif ARM64 223b5877cSLinus Walleij 323b5877cSLinus Walleijconfig ARMV8_MULTIENTRY 4*ab65006bSMasahiro Yamada bool "Enable multiple CPUs to enter into U-Boot" 523b5877cSLinus Walleij 66b6024eaSMasahiro Yamadaconfig ARMV8_SPIN_TABLE 76b6024eaSMasahiro Yamada bool "Support spin-table enable method" 86b6024eaSMasahiro Yamada depends on ARMV8_MULTIENTRY && OF_LIBFDT 96b6024eaSMasahiro Yamada help 106b6024eaSMasahiro Yamada Say Y here to support "spin-table" enable method for booting Linux. 116b6024eaSMasahiro Yamada 126b6024eaSMasahiro Yamada To use this feature, you must do: 136b6024eaSMasahiro Yamada - Specify enable-method = "spin-table" in each CPU node in the 146b6024eaSMasahiro Yamada Device Tree you are using to boot the kernel 156b6024eaSMasahiro Yamada - Let secondary CPUs in U-Boot (in a board specific manner) 166b6024eaSMasahiro Yamada before the master CPU jumps to the kernel 176b6024eaSMasahiro Yamada 186b6024eaSMasahiro Yamada U-Boot automatically does: 196b6024eaSMasahiro Yamada - Set "cpu-release-addr" property of each CPU node 206b6024eaSMasahiro Yamada (overwrites it if already exists). 216b6024eaSMasahiro Yamada - Reserve the code for the spin-table and the release address 226b6024eaSMasahiro Yamada via a /memreserve/ region in the Device Tree. 236b6024eaSMasahiro Yamada 2423b5877cSLinus Walleijendif 25