[U-Boot] [U-Boot, v6, 02/10] arm: relocation: clear .bss section with arch memset if defined

[Tom Rini]

On Wed, Mar 04, 2015 at 02:01:22PM +0100, Przemyslaw Marczak wrote:

> For ARM architecture, enable the CONFIG_USE_ARCH_MEMSET/MEMCPY,
> will highly increase the memset/memcpy performance. This is able
> thanks to the ARM multiple register instructions.
> 
> Unfortunatelly the relocation is done without the cache enabled,
> so it takes some time, but zeroing the BSS memory takes much more
> longer, especially for the configs with big static buffers.
> 
> A quick test confirms, that the boot time improvement after using
> the arch memcpy for relocation has no significant meaning.
> The same test confirms that enable the memset for zeroing BSS,
> reduces the boot time.
> 
> So this patch enables the arch memset for zeroing the BSS after
> the relocation process. For ARM boards, this can be enabled
> in board configs by defining: 'CONFIG_USE_ARCH_MEMSET'.
> 
> This was tested on Trats2.
> A quick test with trace. Boot time from start to main_loop() entry:
> - ~1384ms - before this change
> -  ~888ms - after this change
> 
> Signed-off-by: Przemyslaw Marczak <p.marczak at samsung.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Cc: Albert Aribaud <albert.u.boot at aribaud.net>
> Cc: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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