[U-Boot] [RFC/PATCH] Makefile: allow boards to check file size limits

[Wolfgang Denk]

Dear Mike Frysinger,

In message <1287025103-26681-1-git-send-email-vapier at gentoo.org> you wrote:
> Boards often have a reserved size limit on the flash where they're stored.
> Sometimes during upgrades or config changes, those limits are exceeded,
> but no one notices until they try to upgrade and the limit screws things
> up.  Either not enough of U-Boot is written to flash (and so the reboot
> fails), or too much is written (and so things after it get clobbered).
> 
> So allow boards to declare a size limit (in bytes) and have the build
> system check it while building.
> 
> Signed-off-by: Mike Frysinger <vapier at gentoo.org>
> ---
>  Makefile |   17 +++++++++++++++++
>  1 files changed, 17 insertions(+), 0 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index de4ceb9..ca12d78 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -304,6 +304,21 @@ __LIBS := $(subst $(obj),,$(LIBS)) $(subst $(obj),,$(LIBBOARD))
>  #########################################################################
>  #########################################################################
>  
> +ifneq ($(CONFIG_BOARD_SIZE_LIMIT),)
> +BOARD_SIZE_CHECK = \
> +	@actual=`wc -c $@ | awk '{print $$1}'`; \

How about using

	stat -c '%s'

to get the file size in a single command, without need to actually
read all the data?


Best regards,

Wolfgang Denk

-- 
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