arm: Support a separate stack for VPL

VPL has the same needs as TPL in situations where the stack is at the
top of SRAM. Add an option for this and implement it for arm

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/common/spl/Kconfig.vpl b/common/spl/Kconfig.vpl
index cf6b36c..4345624 100644 (file)
--- a/common/spl/Kconfig.vpl
+++ b/common/spl/Kconfig.vpl
@@ -266,6 +266,20 @@ config VPL_MAX_SIZE
          The maximum size (in bytes) of the TPL stage. This size is determined
          by the amount of internal SRAM memory.
 
+config VPL_HAVE_INIT_STACK
+       bool "VPL requires a initial, fixed, stack-pointer location"
+       help
+         Enable if the VPL phase should not use inherit its initial
+         stack-pointer from the settings for U-Boot proper, but should set
+         its own value.
+
+config VPL_STACK
+       hex "Address of the initial stack-pointer for the VPL phase"
+       depends on VPL_HAVE_INIT_STACK
+       help
+         The address of the initial stack-pointer for the VPL phase
+         Usually this will be the (aligned) top-of-stack.
+
 config VPL_BINMAN_SYMBOLS
        bool "Declare binman symbols in VPL"
        depends on VPL_FRAMEWORK && BINMAN