[U-Boot] Testing Data Cache for armv7 (beagleboard)

[Reinhard Meyer]

Dear chris chriss,
> I'm trying to test the cache on my beagle with a snapshot from the git tree
> today.  I tried it out by loading a file from the mmc with dcache off and
> then dcache on.  I didn't see any difference in speed.  After reading this
> commit (http://git.denx.de/?p=u-boot.git;a=commit;h=95c6f6d), I expected to
> see a performance improvement.

Maybe you should try a comparable test scenario to that of loading a
really large file from a fast storage medium like NAND instead a small
file from a slow, serial, probably SPI driven medium...

Reinhard

> <capture>
>
> OMAP3 beagleboard.org # mmc init 1
> mmc1 is available
> OMAP3 beagleboard.org # dcache
> Data (writethrough) Cache is OFF
> OMAP3 beagleboard.org # fatload mmc 0:1 0x80000000 uImage.bin
> reading uImage.bin
>
> 3852836 bytes read
> OMAP3 beagleboard.org # dcache on
> Data (writethrough) Cache is ON
> OMAP3 beagleboard.org # fatload mmc 0:1 0x80000000 uImage.bin
> reading uImage.bin
>
> 3852836 bytes read
> OMAP3 beagleboard.org #
>
> </capture>