Hi all,
I'm making quite good progress porting U-Boot (2009.03) to my custom PPC440GX board. 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).
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. Commenting out that call (just to try it) solves the exception problem, but the RAM initialization time does not really seem to improve.
What can I do to speed up this ECC initialization? Have I forgotten something when I try to enable the D cache? Any suggestions are welcome.
Kind regards, Met vriendelijke groet, Wouter Eckhardt Engineer wouter.eckhardt@prodrive.nl tel. +31 40 2676187 Prodrive B.V. Postbus 28030 5602 JA Eindhoven Ekkersrijt 5025 5692 EB Son The Netherlands tel. +31 40 2676200 fax: +31 40 2676201 www.prodrive.nl
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