Carl-Daniel Hailfinger <[email protected]> writes: > Assuming you don't have anything you want to cache near 4 GB (like flash): > Both strategies are equally efficient if the contiguous cacheable area > has a size of 2^n+2^(n-1). > The additive strategy is more efficient if the size is 2^n+2^(n-k) and k>1. > The subtractive strategy is more efficient if the size is 2^n-2^(n-k) > and k>1. > > I hope that you accept this without a detailed mathematical proof. ;-) > >> I wonder... the subtractive strategy you subscribe is mentioned in >> mtrr.c too and the comment claims it is implemented. But it very much >> seems it is not. >> > > Ouch.
When did it break? I remember the subtractive mtrr setup working correctly. At least most of the time. Eric -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
