Re: [PATCH linux-next v3 05/14] crash: clean up kdump related config items

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Baoquan,

On Thu, 2024-08-22 at 17:17 +0800, Baoquan He wrote:
> > The change to enable CONFIG_CRASH_DUMP by default apparently broke the boot
> > on 32-bit Power Macintosh systems which fail after GRUB with:
> > 
> > 	"Error: You can't boot a kdump kernel from OF!"
> > 
> > We may have to turn this off for 32-bit Power Macintosh systems.
> > 
> > See this thread on debian-powerpc ML: https://lists.debian.org/debian-powerpc/2024/07/msg00001.html
> 
> If so, fix need be made.
> 
> We may need change in ARCH_SUPPORTS_CRASH_DUMP of ppc, can you or anyone
> post a patch? I don't know how to identify 32-bit Power Macintosh.
> 
> arch/powerpc/Kconfig:
> ===
> config ARCH_SUPPORTS_CRASH_DUMP
>         def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
>         
> config ARCH_SELECTS_CRASH_DUMP
>         def_bool y
>         depends on CRASH_DUMP
>         select RELOCATABLE if PPC64 || 44x || PPC_85xx
> ......
> config PHYSICAL_START
>         hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
>         default "0x02000000" if PPC_BOOK3S && CRASH_DUMP && !NONSTATIC_KERNEL
>         default "0x00000000"

I think the architecture does support crash dumps, but I think the kernel has to
be booted from kexec in this case. Booting a kernel with CRASH_DUMP enabled won't
work from Open Firmware. So, I think CRASH_DUMP should just be disabled for
PPC_BOOK3S_32 by default and users who want to use it on these systems, will have to
enable it explicitly.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913





[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Kernel Development]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite Info]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Linux Media]     [Device Mapper]

  Powered by Linux