Messages in this thread |  | | From | Benjamin Herrenschmidt <> | Subject | Re: consequences of lowering "MAX_LOW_MEM"? | Date | Wed, 4 Sep 2002 22:02:27 +0200 |
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> >> >I think you'll find yourself with no virtual address space left to >> >do vmalloc / fixmap / kmap type stuff. Or at least you would on i386, >> >I presume it's the same for ppc. Sounds like you may have left >> >yourself enough space for fixmap & kmap, but any calls to vmalloc >> >will probably fail ? >> >> Yes, same problem on PPC, you'll run out of virtual space quite >> quickly for vmalloc and ioremap. Stuff a video board with lots >> of VRAM or any PCI card exposing large MMIO regions into your >> machines and it will probably not even boot. >> >> Ben. >> > >Ben, > But doesn't using Matt's suggestion and moving both MAX_LOW_MEM and >changing KERNELBASE take care of this? It's an embedded board with no >video, but it does have one PCI Mezzanine Card (PMC) on it.
Yes, Matt's suggestion would work, though I never tried lowering KERNELBASE. I don't think the kernel supports lowering it below 0x80000000 btw.
Ben.
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