RE: [Fastboot] IA64 Kdump patch V3

From: Zou, Nanhai <nanhai.zou_at_intel.com>
Date: 2006-08-30 11:54:46
> -----Original Message-----
> From: Jay Lan [mailto:jlan@sgi.com]
> Sent: 2006年8月30日 9:46
> To: Zou, Nanhai
> Cc: Linux-IA64; fastboot; Luck, Tony; Dave Anderson; Eric W. Biederman; Horms
> Subject: Re: [Fastboot] IA64 Kdump patch V3
> 
> Zou, Nanhai wrote:
> >>-----Original Message-----
> >>From: Jay Lan [mailto:jlan@sgi.com]
> >>Sent: 2006年8月30日 9:27
> >>To: Zou, Nanhai
> >>Cc: Linux-IA64; fastboot; Luck, Tony; Dave Anderson; Eric W. Biederman; Horms
> >>Subject: Re: [Fastboot] IA64 Kdump patch V3
> >>
> >>Jay Lan wrote:
> >>
> >>>Hi Nanhai,
> >>>
> >>>There is a problem in sn2. The sn2 does not have any memory with
> >>>a predictible offset. It is not possible to specify a memory location
> >>>at boot.
> >>>
> >>>I modified the efi_initialize_iomem_resources() routine in
> >>>arch/ia64/kernel/efi.c to calculate crashk_res.start and .end on the
> >>>fly and uses the "A" of crashkernel=A@B as size to find a region
> >>>that fits.
> >>>
> >>>Maybe we should separate A and B as two options?
> >>
> >>The "B" part of the crashkernel boot option is meaningless to sn2
> >>machine and can be very confusing to sn2 users.
> >>
> >
> >
> >  Hi, Jay
> > 	It is possible to have only A option and let kernel determine the B address
> at startup time. Horms has patch to do that, I will merge it.
> >
> That would be great!
> 
> >
> >>>I now have memory reserved, but kernal hanged when executing 'kexec'
> >>>command. There must be similar issues in kexec.
> >>
> >>On further debugging, the kexec dumped core instead at this statement:
> >>+        elf_rel_set_symbol(&info->rhdr, "__boot_param_base",
> >>+                        &boot_param_base, sizeof(long));
> >>
> >>of elf_ia64_load() in kexec/arch/ia64/kexec-elf-ia64.c.
> >>
> >>Examing the memory i found "__boot_param_base" indeed not present in
> >>the symbol table.
> >>
> >>It seems that purgatory/arch/ia64/entry.S does not have a line
> >>+DECLARE_DATAB(____boot_param_base).
> >>Is it not needed in other ia64 machines? How does it work in HP
> >>machines?
> >
> >   There is a DECLARE_DATA8(__boot_param_base) in
> purgatory/arch/ia64/entry.S
> >   Are you using kexec-tools-kdump10 patch?
> 
> Yes, i apply the kexec-tools-kdump10 patch and the "reserve efi memmap
> and boot param" patch from you. Only these two. Did i miss any?
> 
 Then there should be a line 
DECLARE_DATA8(__boot_param_base) in purgatory/arch/ia64/entry.S...

 If it is hang in kernel, maybe there is something wrong with the physical destination address of reserved region, have you checked the /proc/iomem?

Thanks
Zou Nan hai

> Thanks,
>   - jay
> 
> 
> >
> >  Thanks
> >  Zou Nan hai
> >
> >>Thanks,
> >>  - jay
> >>
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Received on Wed Aug 30 11:55:44 2006

This archive was generated by hypermail 2.1.8 : 2006-08-30 11:55:56 EST