path: root/tools
diff options
authorBernhard Nortmann <>2015-09-17 18:52:51 +0200
committerHans de Goede <>2015-09-29 11:50:07 +0200
commita188438175bd5fb4ef0440c9fdd0ded8b5640b3d (patch)
treec30231ef3e1e183e913ec6a17300f25f68f0e724 /tools
parente954eb8028d7085fc8d0737c8e637ab940f7f147 (diff)
sunxi: (mksunxiboot) signature to indicate "sunxi" SPL variant
This patch follows up on a discussion of ways to improve support for the sunxi FEL ("USB boot") mechanism, especially with regard to boot scripts, see: The idea is to convert the (currently unused) "pad" bytes in the SPL header into an area where data can be passed to U-Boot. To do this safely, we have to make sure that we're actually using our "sunxi" flavor of the SPL, and not the Allwinner boot0. The modified mksunxiboot introduces a special signature to the SPL header in place of the "pub_head_size" field. This can be used to reliably distinguish between compatible versions of sunxi SPL and anything else (older variants or Allwinner's boot0). Signed-off-by: Bernhard Nortmann <> Acked-by: Siarhei Siamashka <> Acked-by: Hans de Goede <> Signed-off-by: Hans de Goede <>
Diffstat (limited to 'tools')
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/mksunxiboot.c b/tools/mksunxiboot.c
index 54f4d0564e..9c1c5b7cee 100644
--- a/tools/mksunxiboot.c
+++ b/tools/mksunxiboot.c
@@ -118,6 +118,10 @@ int main(int argc, char *argv[])
ALIGN(file_size + sizeof(struct boot_file_head), BLOCK_SIZE);
img.header.b_instruction = cpu_to_le32(img.header.b_instruction);
img.header.length = cpu_to_le32(img.header.length);
+ memcpy(img.header.spl_signature, SPL_SIGNATURE, 3); /* "sunxi" marker */
+ img.header.spl_signature[3] = SPL_HEADER_VERSION;
count = write(fd_out, &img, le32_to_cpu(img.header.length));
OpenPOWER on IntegriCloud