From a188438175bd5fb4ef0440c9fdd0ded8b5640b3d Mon Sep 17 00:00:00 2001 From: Bernhard Nortmann Date: Thu, 17 Sep 2015 18:52:51 +0200 Subject: 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: https://groups.google.com/d/msg/linux-sunxi/wBEGUoLNRro/rHGq6nSYCQAJ 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 --- tools/mksunxiboot.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'tools/mksunxiboot.c') 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; + gen_check_sum(&img.header); count = write(fd_out, &img, le32_to_cpu(img.header.length)); -- cgit v1.2.3