From mboxrd@z Thu Jan 1 00:00:00 1970 From: Scott Wood Date: Thu, 14 Nov 2013 17:59:12 -0600 Subject: [U-Boot] [U-Boot,PATCHv4] Optimized nand_read_buf for kirkwood In-Reply-To: <52848761.3080004@keymile.com> References: <1377519056-25364-1-git-send-email-phil.sutter@viprinet.com> <20131114013102.GA12213@home.buserror.net> <52848761.3080004@keymile.com> Message-ID: <1384473552.1403.227.camel@snotra.buserror.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On Thu, 2013-11-14 at 09:18 +0100, Holger Brunck wrote: > Hi Scott, > > On 11/14/2013 02:31 AM, Scott Wood wrote: > > On Mon, Aug 26, 2013 at 02:10:56PM +0200, Phil Sutter wrote: > >> From: Nico Erfurth > >> > >> The basic idea is taken from the linux-kernel, but further optimized. > >> > >> First align the buffer to 8 bytes, then use ldrd/strd to read and store > >> in 8 byte quantities, then do the final bytes. > >> > >> Tested using: 'date ; nand read.raw 0xE00000 0x0 0x10000 ; date'. > >> Without this patch, NAND read of 132MB took 49s (~2.69MB/s). With this > >> patch in place, reading the same amount of data was done in 27s > >> (~4.89MB/s). So read performance is increased by ~80%! > >> > >> Signed-off-by: Nico Erfurth > >> Tested-by: Phil Sutter > >> Cc: Prafulla Wadaskar > >> > >> --- > >> Changed since V3: > >> - fixed author > >> --- > >> drivers/mtd/nand/kirkwood_nand.c | 32 ++++++++++++++++++++++++++++++++ > >> 1 file changed, 32 insertions(+) > > > > I tried to build-test this, and I couldn't find any board that defines > > CONFIG_NAND_KIRKWOOD. > > > > it's not in board specific code defined it's defined in a common kirkwood header: > > arch/arm/include/asm/arch-kirkwood/config.h:58:#define CONFIG_NAND_KIRKWOOD Oops. I thought I grepped the whole tree rather than just include/, but apparently not. -Scott