Hi Stefan, I don't have much knowledge about how u-boot being implemented.
>Why is this? Which "Board Memory Map" are you referring to? I am referring to 'Peripheral Registers' table given in 'PPC440GX® Evaluation Board User’s Manual'. I found the 32 bit value passed to the 'telbentry' macro is matching with the values given in the '32 Bit Address' column of the table except for 'PCI Memory - cached'. And this mismatch confused me. From your last reply I understood that it is the developer who got the freedom to decide the 32-bit value. Is that correct? Regards, Sachin Stefan Roese wrote: > On Monday 16 June 2008, Sachin Rane wrote: > >> Infact I was looking for the info to create a proper 'tlbentry' in 'init.S' >> As per my understanding the 'tlbentry' is to map 32-bit address to 36-bit >> address. >> >> The 'tlbenry' for the PCI Memory in 'init.S' is : >> tlbentry( CFG_PCI_MEMBASE, SZ_256M, 0x00000000, 3, AC_R|AC_W|SA_G|SA_I ) >> >> The 'CFG_PCI_MEMBASE' is set to 0x80000000 in 'ocotea.h'. >> >> My question is how to select the value for 'CFG_PCI_MEMBASE'. >> Can I use any value (say 0x50000000 ) provided it is not overlapping with >> other devices? >> > > Yes. I suggest to start with 0x80000000 since this leaves the first 2 GB for > SDRAM. > > >> If we are using Board Memory Map as a reference then the 32-bit address >> 'CFG_PCI_MEMBASE' used in 'telbentry' should have set to: 0x90000000 >> > > Why is this? Which "Board Memory Map" are you referring to? > > >> I am trying to find out the logic behind the selection of value for the >> variabale 'CFG_PCI_MEMBASE' in: tlbentry( CFG_PCI_MEMBASE, SZ_256M, >> 0x00000000, 3, AC_R|AC_W|SA_G|SA_I ) >> > > Whats the problems with using 0x80000000 here? > > 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
