Hello,
On 02/18/2015 05:23 AM, Simon Glass wrote:
On 16 February 2015 at 08:13, Przemyslaw Marczak p.marczak@samsung.com wrote:
This commit enables the following configs:
- CONFIG_USE_ARCH_MEMCPY
- CONFIG_USE_ARCH_MEMSET
This increases the performance of memcpy/memset and also reduces the boot time.
This was tested on Trats2. A quick test with trace. Boot time from start to main_loop() entry:
- ~1527ms - before this change (arch memset enabled for .bss clear)
- ~1384ms - after this change
Signed-off-by: Przemyslaw Marczak p.marczak@samsung.com Cc: Minkyu Kang mk7.kang@samsung.com Cc: Akshay Saraswat akshay.s@samsung.com Cc: Simon Glass sjg@chromium.org Cc: Sjoerd Simons sjoerd.simons@collabora.co.uk
include/configs/exynos-common.h | 3 +++ 1 file changed, 3 insertions(+)
Reviewed-by: Simon Glass sjg@chromium.org
BTW in case you are interested, in the Chromium U-Boot tree (chromeos-v2013.06 branch) we have exynos support for turning on the cache in SPL and leaving it on through to the end of U-Boot. It runs two SPLs and two U-Boots (with verified boot and kernel verification) in a total of about 750ms. This shipped last year with Pit and Pi (Samsung Chromebook 2).
Might be some interesting patches there...
Regards, Simon
This is very interesting. Some time ago I made some tests witch the cache on/off cases for s-boot(bl1/Bl2 for trats2). Enabling the cache incredible improve the performance. Since it is easy to break the Trats2, such changes in the s-boot has no sense. But it could be easy in the future to modify the bl2 for Odroid.
Best regards,