SPEAr: Enable dcache for fast file transfer
authorShiraz Hashim <shiraz.hashim@st.com>
Mon, 7 May 2012 07:36:53 +0000 (13:06 +0530)
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>
Sat, 7 Jul 2012 12:07:41 +0000 (14:07 +0200)
commitbda7f435a22c024959e831f089da19052cfff113
treea80cccc68497cd8db674283e781a41ddc3019af8
parent25b741a4efc280ab58e8a2d7b669de6d4ea4a7fb
SPEAr: Enable dcache for fast file transfer

Enable data cache with 1:1 mapping of DDR to enable fast file
transfer over tty which was doing lot of copy.

This feature is enabled only for flashing operation i.e. when
CONFIG_SPEAR_USBTTY is enabled.

This has been tested on SPEAr320, SPEAr600 and SPEAr900 evaluation
boards.

Following figures show an estimate on the performance improvements. The
test setup was a Linux host (not Windows) and involved measurement of
only binary transfer time, through kermit. The flash erase and flash
copy time would be unaffected by these patches.

Another thing is this that the timings remained more or less same across
ARM9 and Cortex based devices, hence reporting only one of the cases.

Before Enhancements
===================

$ time ukermit.small -p /dev/ttyACM0 -f spear320_uImage.img
Downloading file: 100.00% completed(2014080/2014080 bytes)
real    0m41.228s
user    0m0.002s
sys     0m0.064s

After Enhancements
==================

$ time ukermit.large -p /dev/ttyACM0 -f spear320_uImage.img
Downloading file: 100.00% completed(2014080/2014080 bytes)
real    0m5.441s
user    0m0.001s
sys     0m0.001s

Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>
Signed-off-by: Stefan Roese <sr@denx.de>
board/spear/common/spr_misc.c