[U-Boot] spl: add size check including devicetree

[Tom Rini]

On Fri, Mar 01, 2019 at 10:34:17PM +0100, Simon Goldschmidt wrote:

> Current linker based size checks do not account for the devicetree,
> as this is added after linker stage.
> 
> This patch moves the logic behind U-Boot proper BOARD_SIZE_CHECK
> into a common function that is called for SPL, too.
> 
> For SPL, CONFIG_SPL_MAX_SIZE is used to check u-boot-spl-dtb.bin.
> 
> This is RFC for two reasons:
> - scripts/Kbuild.include might not be the perfect place for this
>   new function but was the only place I found included by both
>   /Makefile and /scripts/Makefile.spl
> - CONFIG_SPL_MAX_SIZE at least for some boards defines the size
>   of the initially available SRAM. However, this check checks the
>   SPL binary only. Initial SRAM must hold gd, heap and stack in
>   addition to that.
> 
> Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>

So, a problem is that we need to get at values after they've been
pre-processed:
/bin/sh: 1: printf: (SRAM_SCRATCH_SPACE_ADDR - CONFIG_SPL_TEXT_BASE): expected numeric value
spl/u-boot-spl-dtb.bin exceeds file size limit:
  limit:  0 bytes
  actual: 124970 bytes
  excess: 124970 bytes
../scripts/Makefile.spl:266: recipe for target 'spl/u-boot-spl-dtb.bin' failed

-- 
Tom
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