On Tue, Jun 1, 2010 at 7:36 AM, Delio Brignoli dbrignoli@audioscience.com wrote:
I have updated this patch based on the comments [1] by Wolfgang Denk and removed unused variables. [1][http://lists.denx.de/pipermail/u-boot/2010-May/071728.html]
Reduce the number of reads per byte transferred on the BUF register from 2 to 1 and take advantage of the TX buffer in the SPI module. On LogicPD OMAP-L138 EVM, SPI read throughput goes up from ~0.8Mbyte/s to ~1.3Mbyte/s. Tested with a 2Mbyte image file. Remove unused variables in the spi_xfer() function.
Signed-off-by: Delio Brignoli dbrignoli@audioscience.com Tested-by: Ben Gardiner bengardiner@nanometrics.ca
Tested-by: Ben Gardiner bengardiner@nanometrics.ca
Applies cleanly to HEAD (9bb3b3d4406c1e388a99f6fb189147d6a06cc2cf) of git://git.denx.de/u-boot.git and HEAD (5f16b8551b125f16cd8d58f278cb25b94272fd9f) of git://arago-project.org/git/people/sekhar/u-boot-omapl1.git .
I am unable to build an SPI-capable u-boot for the da830 or da850 on git://git.denx.de/u-boot.git; tested with HEAD of git://arago-project.org/git/people/sekhar/u-boot-omapl1.git -- there is a noticeable speed improvement in SPI read speed.