[PATCH v20 13/14] arm64: kdump: update a kernel doc

[takahiro.akashi@linaro.org (AKASHI Takahiro)]

Dave, Boaquan,

Thank you for your reviewing.

On Thu, Jun 30, 2016 at 05:00:45PM +0800, Baoquan He wrote:
> On 06/23/16 at 05:54pm, Geoff Levand wrote:
> > From: AKASHI Takahiro <takahiro.akashi@linaro.org>
> > 
> > This patch adds arch specific descriptions about kdump usage on arm64
> > to kdump.txt.
> > 
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> > ---
> >  Documentation/kdump/kdump.txt | 15 ++++++++++++++-
> >  1 file changed, 14 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
> > index 88ff63d..5d6da09 100644
> > --- a/Documentation/kdump/kdump.txt
> > +++ b/Documentation/kdump/kdump.txt
> > @@ -18,7 +18,7 @@ memory image to a dump file on the local disk, or across the network to
> >  a remote system.
> >  
> >  Kdump and kexec are currently supported on the x86, x86_64, ppc64, ia64,
> > -s390x and arm architectures.
> > +s390x, arm and arm64 architectures.
> >  
> >  When the system kernel boots, it reserves a small section of memory for
> >  the dump-capture kernel. This ensures that ongoing Direct Memory Access
> > @@ -249,6 +249,12 @@ Dump-capture kernel config options (Arch Dependent, arm)
> >  
> >      AUTO_ZRELADDR=y
> >  
> > +Dump-capture kernel config options (Arch Dependent, arm64)
> > +----------------------------------------------------------
> > +
> > +1) Currently, kvm will not be enabled on the dump-capture kernel even
> > +   if it is configured.
> > +
> >  Extended crashkernel syntax
> >  ===========================
> >  
> > @@ -305,6 +311,8 @@ Boot into System Kernel
> >     kernel will automatically locate the crash kernel image within the
> >     first 512MB of RAM if X is not given.
> >  
> > +   On arm64, use "crashkernel=Y[@X]".  Note that the start address of
> 				  ~ Why square brackets here, is it
> different than other arch?

I want to clearly indicate that "@X" is optional, and that, when you explicitly
specify it, X must be properly aligned.
I think that "[..]" notation is quite common.

Thanks,
-Takahiro AKASHI

> 
> Except for this, it looks good to me.
> 
> Thanks
> Baoquan
> 
> > +   the kernel, X if explicitly specified, must be aligned to 2MiB (0x200000).
> >  
> >  Load the Dump-capture Kernel
> >  ============================
> > @@ -327,6 +335,8 @@ For s390x:
> >  	- Use image or bzImage
> >  For arm:
> >  	- Use zImage
> > +For arm64:
> > +	- Use vmlinux or Image
> >  
> >  If you are using a uncompressed vmlinux image then use following command
> >  to load dump-capture kernel.
> > @@ -370,6 +380,9 @@ For s390x:
> >  For arm:
> >  	"1 maxcpus=1 reset_devices"
> >  
> > +For arm64:
> > +	"1 maxcpus=1 reset_devices"
> > +
> >  Notes on loading the dump-capture kernel:
> >  
> >  * By default, the ELF headers are stored in ELF64 format to support
> > -- 
> > 2.5.0
> > 
> > 
> > 
> > _______________________________________________
> > kexec mailing list
> > kexec at lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/kexec