spl: Add support for passing handoff info to U-Boot proper
There is some basic informaton that SPL normally wants to pass through to
U-Boot, such as the SDRAM size and bank information.
Mkae use of the new bloblist structure for this. Add a new 'handoff' blob
which is set up in SPL and passed to U-Boot proper. Also adda test for
sandbox_spl that checks that this works correctly and a new 'sb' command
to show the information passed from SPL.
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 32fa575..0ddbffc 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -25,8 +25,28 @@
supports MMC, NAND and YMODEM and other methods loading of U-Boot
and the Linux Kernel. If unsure, say Y.
+config HANDOFF
+ bool "Pass hand-off information from SPL to U-Boot proper"
+ depends on BLOBLIST
+ help
+ It is useful to be able to pass information from SPL to U-Boot
+ proper to preserve state that is known in SPL and is needed in U-Boot.
+ Enable this to locate the handoff information in U-Boot proper, early
+ in boot. It is available in gd->handoff. The state state is set up
+ in SPL (or TPL if that is being used).
+
if SPL
+config SPL_HANDOFF
+ bool "Pass hand-off information from SPL to U-Boot proper"
+ depends on HANDOFF
+ default y
+ help
+ This option enables SPL to write handoff information. This can be
+ used to pass information like the size of SDRAM from SPL to U-Boot
+ proper. Also SPL can receive information from TPL in the same place
+ if that is enabled.
+
config SPL_LDSCRIPT
string "Linker script for the SPL stage"
default "arch/$(ARCH)/cpu/u-boot-spl.lds"
@@ -867,6 +887,16 @@
if TPL
+config TPL_HANDOFF
+ bool "Pass hand-off information from TPL to SPL and U-Boot proper"
+ depends on HANDOFF
+ default y
+ help
+ This option enables TPL to write handoff information. This can be
+ used to pass information like the size of SDRAM from TPL to U-Boot
+ proper. The information is also available to SPL if it is useful
+ there.
+
config TPL_BOARD_INIT
bool "Call board-specific initialization in TPL"
help