On Monday 30 June 2008, Yi-Neng Lin (林義能) wrote: > Thanks a lot for your reply, Stefan. However, in my understanding, only > memory-related info is stored in the EEPROM in the memory module, isn't it?
Yes, the I2C EEPROM on the DIMM has of course only memory module related stuff. But I was referring to the 405EX bootstrap EEPROM (see chapter 9.2 IIC serial EPROM controller (IEC) Operation in the 405EP users manual). > The CPU and bus related info is hard-coded in the code. This is what I saw > from my code. Not very sure of it, though. Yes, could be that you are using the fixed, compiled-in speed configuration. > I think it's the spd_sdram() [cpu/ppc4xx] who does the job, which could > have been an outdated method. It was renamed and is now called 40x_spd_sdram.c. For board with DIMM modules on 405EP this is the way to go. > The timing info is read from the SPD (Serial > Presence Detect) EEPROM on the SDRAM module. My question is, with the > upgraded CPU clock (333MHz), ordinary SDRAMs (PC100 and PC133) may not be > able to support it, which means I may have to use PC2700 (333MHz; too > fast?) or PC66(66MHz; too slow?). Am I correct? Any other comment or > solution for this? I'm pretty sure that you still can use the "ordinary" DIMMs. The driver should configure the needed parameters like CAS latency accordingly. Best regards, 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: [EMAIL PROTECTED] ===================================================================== ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
