[U-Boot] [PATCH] sunxi: Add the ability to pass (script) filesize in the SPL header

[Bernhard Nortmann]

Convert one of the "reserved" fields in the sunxi SPL header to
a fel_script_length entry. That enables the sunxi-fel utility
to pass the script size when booting over USB ("FEL mode").

If board.c encounters a non-zero value in this header field, it
will set U-Boot's "filesize" environment variable accordingly.

sunxi-fel currently doesn't use this field (i.e. fel_script_length
will remain 0), but it would allow for new use cases, e.g. passing
tweaked/additional settings via a text file (uEnv.txt style), and
then using "import -t ${fel_script_addr} ${filesize}" on them.

Signed-off-by: Bernhard Nortmann <bernhard.nortmann at web.de>

---

 arch/arm/include/asm/arch-sunxi/spl.h | 3 ++-
 board/sunxi/board.c                   | 8 +++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/arch-sunxi/spl.h b/arch/arm/include/asm/arch-sunxi/spl.h
index a0f33b0..0e18438 100644
--- a/arch/arm/include/asm/arch-sunxi/spl.h
+++ b/arch/arm/include/asm/arch-sunxi/spl.h
@@ -49,7 +49,8 @@ struct boot_file_head {
 		uint8_t spl_signature[4];
 	};
 	uint32_t fel_script_address;
-	uint32_t reserved1[3];
+	uint32_t fel_script_length;
+	uint32_t reserved1[2];
 	uint32_t boot_media;		/* written here by the boot ROM */
 	uint32_t reserved2[5];		/* padding, align to 64 bytes */
 };
diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index d09cf6d..cf0ff33 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -585,9 +585,15 @@ static void parse_spl_header(const uint32_t spl_addr)
 	if (memcmp(spl->spl_signature, SPL_SIGNATURE, 3) == 0) {
 		uint8_t spl_header_version = spl->spl_signature[3];
 		if (spl_header_version == SPL_HEADER_VERSION) {
-			if (spl->fel_script_address)
+			if (spl->fel_script_address) {
 				setenv_hex("fel_scriptaddr",
 					   spl->fel_script_address);
+				if (spl->fel_script_length)
+					setenv_hex("filesize",
+						   spl->fel_script_length);
+				else
+					setenv("filesize", NULL);
+			}
 			return;
 		}
 		printf("sunxi SPL version mismatch: expected %u, got %u\n",
-- 
2.7.3