On Mon, 16 Jan 2006 18:05, Andrew Morton wrote: > "Serge E. Hallyn" <[email protected]> wrote: > > On my power5 partition, 2.6.15-mm4 hangs on boot > > It might be worth reverting the changes to arch/powerpc/mm/hash_utils_64.c, > see if that unbreaks it. > > - base = lmb.memory.region[i].base + KERNELBASE; > + base = (unsigned long)__va(lmb.memory.region[i].base); You can try it, but if that fixes the problem I'll buy a sombrero and then eat it. > The nice comment in page.h: > > * KERNELBASE is the virtual address of the start of the kernel, it's often > * the same as PAGE_OFFSET, but _might not be_. > * > * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET. > * > * To get a physical address from a virtual one you subtract PAGE_OFFSET, > * _not_ KERNELBASE. > > Tells us that was not an equivalent transformation. True, not equivalent in all cases, but correct. For non-kdump kernels (which I assume this is) KERNELBASE == PAGE_OFFSET, and for a kdump kernel that code wants to use PAGE_OFFSET, not KERNELBASE. Try enabling early debugging (see arch/powerpc/kernel/setup_64.c) and then turning on DEBUG in hash_utils_64.c, setup_64.c etc. cheers -- Michael Ellerman IBM OzLabs email: michael:ellerman.id.au inmsg: mpe:jabber.org wwweb: http://michael.ellerman.id.au phone: +61 2 6212 1183 (tie line 70 21183) We do not inherit the earth from our ancestors, we borrow it from our children. - S.M.A.R.T Person
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