On Mon, Feb 04, 2013 at 01:54:00PM -0600, Cliff Wickman wrote: > From: Cliff Wickman <cpw at sgi.com> > > The crash kernel is not able to find its root device if that device is not > on PCI 0. > > This is because it is booted with the command line option memmap=exactmap > which currently clears the e820 table and does not restore reserved spaces. > > This works for a device on PCI 0 because ACPI falls back to a legacy mode. > But the error message " [Firmware Bug]: PCI: MMCONFIG at > [mem 0x80000000-0x80cfffff] not reserved in ACPI motherboard resources" > is written to the log even in this functioning case. > > It fails for some devices on UV2, and only for UV2, because SGI seems to > be the only manufacturer currently using the extended PCI(>0). > > The fix is simple, as long as the command line is long enough to include > all the reserved spaces. > The command line may have to be lengthened. See > [PATCH] kexec: lengthen the kernel command line image Thanks, applied.
