util/cbfstool: Support FIT payloads

In order to support booting a GNU/Linux payload on non x86, the FIT format
should be used, as it is the defacto standard on ARM.
Due to greater complexity of FIT it is not converted to simple ELF format.

Add support for autodecting FIT payloads and add them as new CBFS_TYPE 'fit'.
The payload is included as is, with no special header.
The code can determine the type at runtime using the CBFS_TYPE field.
Support for parsing FIT payloads in coreboot is added in a follow on
commit.
Compression of FIT payloads is not supported, as the FIT sections might be
compressed itself.

Starting at this point a CBFS payload/ can be either of type FIT or SELF.

Tested on Cavium SoC.

Change-Id: Ic5fc30cd5419eb76c4eb50cca3449caea60270de
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/25860
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/util/cbfstool/cbfs-mkpayload.c b/util/cbfstool/cbfs-mkpayload.c
index fd2c4ca0117b..6dc163433d02 100644
--- a/util/cbfstool/cbfs-mkpayload.c
+++ b/util/cbfstool/cbfs-mkpayload.c
@@ -24,6 +24,7 @@
 #include "cbfs.h"
 #include "fv.h"
 #include "coff.h"
+#include "fdt.h"
 
 /* serialize the seg array into the buffer.
  * The buffer is assumed to be large enough.
@@ -416,3 +417,39 @@ int parse_fv_to_payload(const struct buffer *input, struct buffer *output,
 	return 0;
 
 }
+
+int parse_fit_to_payload(const struct buffer *input, struct buffer *output,
+			 enum comp_algo algo)
+{
+	struct fdt_header *fdt_h;
+
+	DEBUG("start: parse_fit_to_payload\n");
+
+	fdt_h = buffer_get(input);
+	if (be32toh(fdt_h->magic) != FDT_HEADER_MAGIC) {
+		INFO("Not a FIT payload.\n");
+		return -1;
+	}
+
+	/**
+	 * For developers:
+	 * Compress the kernel binary you're sourcing in your its-script
+	 * manually with LZ4 or LZMA and add 'compression = "lz4"' or "lzma" to
+	 * the kernel@1 node in the its-script before assembling the image with
+	 * mkimage.
+	 */
+	if (algo != CBFS_COMPRESS_NONE) {
+		ERROR("FIT images don't support whole-image compression,"
+		      " compress the kernel component instead!\n")
+		return -1;
+	}
+
+	if (buffer_create(output, buffer_size(input), input->name) != 0)
+		return -1;
+
+	memcpy(buffer_get(output), buffer_get(input), buffer_size(input));
+
+	DEBUG("done\n");
+
+	return 0;
+}