From 1c75d5dfb03181bc481fe021dc5a8ab29c0f7557 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Sun, 25 Dec 2016 13:52:22 +0900 Subject: fiptool: support --align option to add desired alignment to image offset The current fiptool packs all the images without any padding between them. So, the offset to each image has no alignment. This is not efficient, for example, when the FIP is read from a block-oriented device. For example, (e)MMC is accessed by block-addressing. The block size is 512 byte. So, the best case is each image is aligned by 512 byte since the DMA engine can transfer the whole of the image to its load address directly. The worst case is the offset does not have even DMA-capable alignment (this is where we stand now). In this case, we need to transfer every block to a bounce buffer, then do memcpy() from the bounce buffer to our final destination. At least, this should work with the abstraction by the block I/O layer, but the CPU-intervention for the whole data transfer makes it really slow. This commit adds a new option --align to the fiptool. This option, if given, requests the tool to align each component in the FIP file by the specified byte. Also, add a new Make option FIP_ALIGN for easier access to this feature; users can give something like FIP_ALIGN=512 from the command line, or add "FIP_ALIGN := 512" to their platform.mk file. Signed-off-by: Masahiro Yamada --- Makefile | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Makefile') diff --git a/Makefile b/Makefile index e9a07840..001e94b8 100644 --- a/Makefile +++ b/Makefile @@ -350,6 +350,10 @@ ifeq (${ENABLE_PSCI_STAT},1) ENABLE_PMF := 1 endif +ifneq (${FIP_ALIGN},0) +FIP_ARGS += --align ${FIP_ALIGN} +endif + ################################################################################ # Auxiliary tools (fiptool, cert_create, etc) ################################################################################ -- cgit v1.2.3