[U-Boot] [PATCH] spl: implement stack usage check

[Tom Rini]

On Tue, Jul 16, 2019 at 10:30:36PM +0200, Simon Goldschmidt wrote:

> This implements a stack usage check in SPL.
> 
> Many boards start up SPL to run code + data from one common, rather small
> SRAM. To implement a sophisticated SPL binary size limit on such boards,
> the stack size (as well as malloc size and global data size) must be
> subtracted from this SRAM size.
> 
> However, to do that properly, the stack size first needs to be known.
> 
> This patch adds a new Kconfig option:
> - SPL_SYS_REPORT_STACK_F_USAGE: memset(0xaa) the whole area of the stack
>   very early and check stack usage based on this constant later before the
>   stack is switched to DRAM
> 
> Initializing the stack and checking it is implemented in weak functions,
> in case a board does not use the stack as saved in gd->start_addr_sp.
> 
> Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>

Very nice!  I wish I had thought of something like that years ago when
Wolfgang asked and I came up with the -fstack-usage stuff we have today.

-- 
Tom
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