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.marc...@samsung.com> > Reviewed-by: Simon Glass <s...@chromium.org> > Cc: Albert Aribaud <albert.u.b...@aribaud.net> > Cc: Tom Rini <tr...@konsulko.com>
Applied to u-boot/master, thanks! -- Tom
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