** Changed in: intel
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1297658
Title:
Ubuntu server 14.04 fail in UEFI installation on Rmy4S
Status in intel:
Fix Released
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Trusty:
Fix Released
Bug description:
Label: Rmy08sdp (Romley-4S)
BIOS version: SE5C600.86B.99.99.x059.091020121352
Processor: Intel(R) Xeon(R) CPU E5-4650 C2 stepping
Chipset: Patsburg SSB-T - C1 stepping
OS: Ubuntu 14.04 Server daily image
How to reproduce:
1. select UEFI DVD from boot manager
2. select install ubuntu from grub
3. system will stop a while then reboot.
root cause:
1) Kernel will set memory cache attribute according to efi memeory map
2) if bios set one memory range is EFI_RUNTIME and uncacheable, kernel will
flush this memory
3) system reboot when kernel use cflush instruction on a vga address like
0xA0000~0xBFFFF
the related code is: efi_enter_virtual_mode() in arch/x86/platform/efi/efi.c
two solutions:
1. wait for bios update, but it is hard for some machines.
2. backport following 11 patches which are in kernel 3.14-rc1
f4fccac x86/efi: Simplify EFI_DEBUG
0fd64c2 x86/mm/pageattr: Lookup address in an arbitrary PGD
f3f7296 x86/mm/pageattr: Add a PGD pagetable populating function
4b23538 x86/mm/pageattr: Add a PUD pagetable populating function
f900a4b x86/mm/pageattr: Add a PMD pagetable populating function
c6b6f36 x86/mm/pageattr: Add a PTE pagetable populating function
0bb8aee x86/mm/pageattr: Add a PUD error unwinding path
52a628f x86/mm/pageattr: Add last levels of error path
82f0712 x86/mm/cpa: Map in an arbitrary pgd
d2f7cbe x86/efi: Runtime services virtual mapping
ee41143 x86/efi: Check krealloc return value
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