[coreboot] v3 CAR/ROM area collision on C7 and Core2Duo

Carl-Daniel Hailfinger c-d.hailfinger.devel.2006 at gmx.net
Wed Nov 26 04:33:11 CET 2008

Hi Jason,

thanks for checking this so fast!

On 26.11.2008 01:05, Carl-Daniel Hailfinger wrote:
> On 24.11.2008 04:31, JasonZhao at viatech.com.cn wrote:
>> No VIA's datasheet tell about the location of C7 CAR, and I remember
>> once I used an address even lower than 0xFFBF0000 (NOT 0xc8000). Also I
>> tried 0xFFBF0000 on my current v2-coreboot just now, the result is ok.
> Thanks a lot for checking this.
> If you find some free time, it would be great if you could test
> 0xFEC00000 as well. That location is 20 MB below 4GB and the lowest
> location inside the DEVICE_MEM_HIGH protection window where coreboot
> will not place any device memory regions, so it is free for ROM and CAR.
> If that works, we have found a really collision-free window even for the
> biggest SPI ROMs.

0xFEC00000 with size 0x8000 (32k) works as confirmed by you in IRC.

I'll prepare a patch for v2 and v3 to move the VIA CAR location to



More information about the coreboot mailing list