On Thursday 05 May 2011 17:32:20 Wolfgang Denk wrote: > Dear Alexander Stein, > > In message <201105030848.17576.alexander.st...@systec-electronic.com> you wrote: > > This specific version was selected due to relocation problems on ARM. But > > I expect the dcache doesn't have that big influence on the named code > > part as the environment is already in RAM. > > Your expectation is most likely completely wrong. Reading from / > writing to uncached RAM is painfully slow compared to a system with > caches turned on. And if you - as I speculate - need to checksum a > huge amount of data, this will delay things without need.
Caching has a huge effect on **all** code and is the first thing I'd play with in trying to speed things up. I have been doing some stuff to speed omap3 booting. It was taking approx 4 seconds from power up until the kernel started spewing boot messages. That is now down to less than 2 secs (including the funky omap3 romboot time, loading uboot from NAND and then loading the kernel from NAND). Only difference was turning on caching in uboot using the caching commands. -- Charles _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
