Add core support for a bloblist to convey data from SPL

At present there is no standard way in U-Boot to pass information from SPL
to U-Boot proper. But sometimes SPL wants to convey information to U-Boot
that U-Boot cannot easily figure out. For example, if SPL sets up SDRAM
then it might want to pass the size of SDRAM, or the location of each
bank, to U-Boot proper.

Add a new 'bloblist' feature which provides this. A bloblist is set up in
the first phase of U-Boot that runs (i.e. TPL or SPL). The location of
this info may be in SRAM or CAR (x86 cache-as-RAM) or somewhere else.

Information placed in this region is preserved (with a checksum) through
TPL and SPL and ends up in U-Boot. At this point it is copied into SDRAM
so it can be used after relocation.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Andreas Dannenberg <dannenberg@ti.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/common/Kconfig b/common/Kconfig
index 68e4ddfb4a..57bd16d962 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -750,4 +750,52 @@ config UPDATE_TFTP_MSEC_MAX
 
 endmenu
 
+menu "Blob list"
+
+config BLOBLIST
+	bool "Support for a bloblist"
+	help
+	  This enables support for a bloblist in U-Boot, which can be passed
+	  from TPL to SPL to U-Boot proper (and potentially to Linux). The
+	  blob list supports multiple binary blobs of data, each with a tag,
+	  so that different U-Boot components can store data which can survive
+	  through to the next stage of the boot.
+
+config SPL_BLOBLIST
+	bool "Support for a bloblist in SPL"
+	depends on BLOBLIST
+	default y if SPL
+	help
+	  This enables a bloblist in SPL. If this is the first part of U-Boot
+	  to run, then the bloblist is set up in SPL and passed to U-Boot
+	  proper. If TPL also has a bloblist, then SPL uses the one from there.
+
+config TPL_BLOBLIST
+	bool "Support for a bloblist in TPL"
+	depends on BLOBLIST
+	default y if TPL
+	help
+	  This enables a bloblist in TPL. The bloblist is set up in TPL and
+	  passed to SPL and U-Boot proper.
+
+config BLOBLIST_SIZE
+	hex "Size of bloblist"
+	depends on BLOBLIST
+	default 0x400
+	help
+	  Sets the size of the bloblist in bytes. This must include all
+	  overhead (alignment, bloblist header, record header). The bloblist
+	  is set up in the first part of U-Boot to run (TPL, SPL or U-Boot
+	  proper), and this sane bloblist is used for subsequent stages.
+
+config BLOBLIST_ADDR
+	hex "Address of bloblist"
+	depends on BLOBLIST
+	default 0xe000 if SANDBOX
+	help
+	  Sets the address of the bloblist, set up by the first part of U-Boot
+	  which runs. Subsequent U-Boot stages typically use the same address.
+
+endmenu
+
 source "common/spl/Kconfig"