kexec: include reserved e820 sections in crash kernel
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
Signed-off-by: Cliff Wickman <cpw@sgi.com>
[ horms@verge.net.au: Manually applied due to conflicts ]
Signed-off-by: Simon Horman <horms@verge.net.au>
2 files changed
