arm64: add an option to switch visibility of CONFIG_SYS_INIT_SP_BSS_OFFSET

[oweals/u-boot.git] / arch / arm / Kconfig

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f5a7630e4f99e62f33b4f4f2cbe37bb14eaf2d8a..87541977259cfa7ffe741c915b48ab144543ad5c 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -20,15 +20,25 @@ config POSITION_INDEPENDENT
          information that is embedded into the binary to support U-Boot
          relocating itself to the top-of-RAM later during execution.
 
-config SYS_INIT_SP_BSS_OFFSET
-       int
+config INIT_SP_RELATIVE
+       bool "Specify the early stack pointer relative to the .bss section"
        help
          U-Boot typically uses a hard-coded value for the stack pointer
-         before relocation. Define this option to instead calculate the
+         before relocation. Enable this option to instead calculate the
          initial SP at run-time. This is useful to avoid hard-coding addresses
          into U-Boot, so that can be loaded and executed at arbitrary
-         addresses and thus avoid using arbitrary addresses at runtime. This
-         option's value is the offset added to &_bss_start in order to
+         addresses and thus avoid using arbitrary addresses at runtime.
+
+         If this option is enabled, the early stack pointer is set to
+         &_bss_start with a offset value added. The offset is specified by
+         SYS_INIT_SP_BSS_OFFSET.
+
+config SYS_INIT_SP_BSS_OFFSET
+       int "Early stack offset from the .bss base address"
+       depends on INIT_SP_RELATIVE
+       default 524288
+       help
+         This option's value is the offset added to &_bss_start in order to
          calculate the stack pointer. This offset should be large enough so
          that the early malloc region, global data (gd), and early stack usage
          do not overlap any appended DTB.