[coreboot] ram init help on the i82830

Carl-Daniel Hailfinger c-d.hailfinger.devel.2006 at gmx.net
Wed Jun 4 14:14:49 CEST 2008


On 04.06.2008 04:59, Joseph Smith wrote:
> Good News!!!
> I think I got it working :-)
>   

Great!

> I am running memtest86 right now and if all goes well I build it again with
> filo and test it. 
>
> First I tried with initializing each dimm socket. I booted to memtest and
> it kept erroring out at 256mb. Because this is a double sidded 512MB
> so-dimm, I figured out that each side of each dimm needs to be initialized.
> So I came up with this:
>
>
> 	for (i = 0; i < MAX_DIMM_SIDES; i++) {
> 		dimm_end = pci_read_config8(ctrl->d0, DRB + i);
> 		if (dimm_end > dimm_start) {
> 			PRINT_DEBUG("    Sending RAM command 0x");
> 			PRINT_DEBUG_HEX32(reg32);
> 			PRINT_DEBUG(" to 0x");
> 			PRINT_DEBUG_HEX32((dimm_start * 32 * 1024 * 1024) + addr_offset);
> 			PRINT_DEBUG("\r\n");
> 			read32((dimm_start * 32 * 1024 * 1024) + addr_offset);
> 		}
> 		/* Set the start of the next DIMM. */
> 		dimm_start = dimm_end;
> 	}
>
> It seems to work good so far, hopefully I will be submitting a patch soon.
>   

Please submit a patch now, regardless of how ugly/polluted/unclean it
is. We had too many losses of great patches in the past because
computers died and an early not-ready patch is better than nothing.

Regards,
Carl-Daniel




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