Hi Wouter, On Friday 04 September 2009 14:34:49 Wouter Eckhardt wrote: > I'm making quite good progress porting U-Boot (2009.03) to my custom > PPC440GX board.
2009.03 is already "old". I suggest you use the 2009.09 release. > Right now I'm trying to solve a little problem I have > with board start-up time when I enable ECC on DDR RAM. The board > literally takes minutes to initialize RAM. I'm guessing this is due to > the fact that ecc_init() fills the entire RAM (the comments already > suggest some performance enhancements can be implemented). d-cache is the solution. > I've tried solving this by shortly enabling the D cache before writing > RAM and disabling the D cache afterwards, using the function > change_tlb(). However, if I enable the D cache using change_tlb() and > supply it with the same parameters ecc_init() receives, I get an > exception when change_tlb() invalidates the cache. Did you flush the caches? You need to be careful here, when changing TLB attributes. Which DDR2 init code are you using btw? A specific custom code with fixed settings? Or the 4xx common SPD code? I suggest you take a look at the common DDR2 code (44x_spd_ddr2.c). ECC handling is done there already with caches enabled. This should give you an idea. Cheers, Stefan -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: off...@denx.de _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
