Franck Bui-Huu wrote:
> Thiemo Seufer wrote:
> > Franck Bui-Huu wrote:
> >>
> >> - if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
> >> + if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
> >
> > ISTR this failed on O2, where kernel+initrd are loaded into KSEG0 but the
> > PAGE_OFFSET is for XKPHYS.
> >
>
> I guess that you were meaning somthing like:
>
> LOADADDR = 0xffffffff80004000
> PAGE_OFFSET = 0xa800000000000000
>
> is that correct ?
Yes.
> If so could you explain the choice of these values
> because I fail to understand it.
It allows to load a 64-bit kernel in KSEG0, and use short 2-instruction
symbol references there. At the same time, it allows access to more
address space for memory and I/O than would fit in KSEG0.
Thiemo
