[U-Boot] [U-Boot, v4] arm/arm64: implement a boot header capability

[Tom Rini]

On Tue, May 31, 2016 at 10:45:06AM -0700, Steve Rae wrote:

> From: Andre Przywara <andre.przywara at arm.com>
> 
> Some SPL loaders (like Allwinner's boot0, and Broadcom's boot0)
> require a header before the actual U-Boot binary to both check its
> validity and to find other data to load. Sometimes this header may
> only be a few bytes of information, and sometimes this might simply
> be space that needs to be reserved for a post-processing tool.
> 
> Introduce a config option to allow assembler preprocessor commands
> to be inserted into the code at the appropriate location; typical
> assembler preprocessor commands might be:
>   .space 1000
>   .word 0x12345678
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> Signed-off-by: Steve Rae <srae at broadcom.com>
> Commit Notes:
> Please note that the current code:
>   start.S (arm64) and
>   vectors.S (arm)
> already jumps over some portion of data already, so this option basically
> just increases the size of this region (and the resulting binary).
> 
> For use with Allwinner's boot0 blob there is a tool called boot0img[1],
> which fills the header to allow booting A64 based boards.
> For the Pine64 we need a 1536 byte header (including the branch
> instruction) at the moment, so we add this to the defconfig.
> 
> [1] https://github.com/apritzel/pine64/tree/master/tools
> END
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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