Hi Detlev,
thanks for the help. I have tried CONFIG_CMD_CACHE but this doesn't work, because dcache_enable() is not implemented for PXA.
Then I tried to get the U-Boot source code for Gumstix verdex project, but I can't find it. Where can I download this?
Regards, Andreas
-----Ursprüngliche Nachricht----- Von: Detlev Zundel [mailto:dzu@denx.de] Gesendet: Freitag, 22. Januar 2010 16:20 An: A. Geisreiter Cc: u-boot@lists.denx.de Betreff: Re: AW: [U-Boot] Performance problems with gunzip
Hi Andreas,
thanks for the fast response. How do I enable data caches?
I fear this is not as easy as flipping a bit in a register. Depending on the platform caches tend to be tied to the MMU, so enabling the caches require setting up correct data structures for the MMU to work. That's the non-trivial work.
Apart from that, there is CONFIG_CMD_CACHE which builds common/cmd_cache.c. I see that at least two PXA250 platforms enable this, so maybe simply try that?
Moreover, a quick qoogle showed that the (non-mainline) Gumstix verdex (PXA270) U-Boot port has a dcache command:
http://docwiki.gumstix.org/index.php/U-Boot
Maybe you can reap the code from their repository. If you do, please post it here ;)
Cheers Detlev