On Tue, Nov 24, 2015 at 10:25:34PM +0000, Geoff Levand wrote: > From: AKASHI Takahiro <takahiro.aka...@linaro.org> > > This patch adds arch specific descriptions about kdump usage on arm64 > to kdump.txt. > > Signed-off-by: AKASHI Takahiro <takahiro.aka...@linaro.org> > --- > Documentation/kdump/kdump.txt | 32 +++++++++++++++++++++++++++++++- > 1 file changed, 31 insertions(+), 1 deletion(-) > > diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt > index bc4bd5a..7d3fad0 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 +249,29 @@ Dump-capture kernel config options (Arch Dependent, arm) > > AUTO_ZRELADDR=y > > +Dump-capture kernel config options (Arch Dependent, arm64) > +---------------------------------------------------------- > + > +1) Disable symmetric multi-processing support under "Processor type and > + features": > + > + CONFIG_SMP=n > + > + (If CONFIG_SMP=y, then specify maxcpus=1 on the kernel command line > + when loading the dump-capture kernel, see section "Load the Dump-capture > + Kernel".)
SMP is now forced on, so please update this text. > +2) The maximum memory size on the dump-capture kernel must be limited by > + specifying: > + > + mem=X[MG] > + > + where X should be less than or equal to the size in "crashkernel=" > + boot parameter. Kexec-tools will automatically add this. > + > +3) Currently, kvm will not be enabled on the dump-capture kernel even > + if it is configured. > + > Extended crashkernel syntax > =========================== > > @@ -312,6 +335,8 @@ Boot into System Kernel > any space below the alignment point may be overwritten by the > dump-capture kernel, > which means it is possible that the vmcore is not that precise as > expected. > > + On arm64, use "crashkernel=Y[@X]". Note that the start address of > + the kernel, X if explicitly specified, must be aligned to 2MiB (0x200000). > > Load the Dump-capture Kernel > ============================ > @@ -334,6 +359,8 @@ For s390x: > - Use image or bzImage > For arm: > - Use zImage > +For arm64: > + - Use vmlinux What? Why doesn't Image work? Will _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
