[U-Boot] common, env: optimize boottime

[Tom Rini]

On Thu, Dec 19, 2013 at 01:45:04PM +0100, Heiko Schocher wrote:

> when creating the hashtable, for each environmentvariable
> getenv(ENV_CALLBACK_VAR) and getenv(ENV_FLAGS_VAR) is called,
> which costs at this point a lot of time. So call this two
> getenv() calls only once.
> 
> Boottime on the ids8313 board without this patch:
> 
> 2013-12-19 13:38:22,894:  NAND:  128 MiB
> 2013-12-19 13:38:27,659:  In:    serial
> (~4.8 sec)
> 
> Bootime with this patch on the ids8313 board:
> 
> 2013-12-19 13:40:25,332:  NAND:  128 MiB
> 2013-12-19 13:40:25,546:  In:    serial
> (~0.2 sec)
> 
> Signed-off-by: Heiko Schocher <hs at denx.de>
> Cc: Tom Rini <trini at ti.com>
> Cc: Joe Hershberger <joe.hershberger at ni.com>
> Cc: Wolfgang Denk <wd at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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