From mboxrd@z Thu Jan 1 00:00:00 1970 From: Przemyslaw Marczak Date: Wed, 18 Feb 2015 13:21:30 +0100 Subject: [U-Boot] [PATCH v2 1/8] exynos: config: enable arch memcpy and arch memset In-Reply-To: References: <1424099601-14979-1-git-send-email-p.marczak@samsung.com> <1424099601-14979-2-git-send-email-p.marczak@samsung.com> Message-ID: <54E483CA.8020602@samsung.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hello, On 02/18/2015 05:23 AM, Simon Glass wrote: > On 16 February 2015 at 08:13, Przemyslaw Marczak 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 >> Cc: Minkyu Kang >> Cc: Akshay Saraswat >> Cc: Simon Glass >> Cc: Sjoerd Simons >> --- >> include/configs/exynos-common.h | 3 +++ >> 1 file changed, 3 insertions(+) > > Reviewed-by: Simon Glass > > 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, -- Przemyslaw Marczak Samsung R&D Institute Poland Samsung Electronics p.marczak at samsung.com