[PATCH v4 2/2] kexec-arm64: Add functionality to dump 2nd dtb

Bhupesh Sharma bhsharma at redhat.com
Thu Jun 21 03:24:38 PDT 2018

Since during the arm64 kexec_load()/kdump invocation,
the dtb is passed to the second kernel, it is sometimes useful
to dump the dtb contents (to verify the correctness
of the same).

This patch adds this feature which is enabled when '-d' flag is
used with kexec command line invocation.

Signed-off-by: Bhupesh Sharma <bhsharma at redhat.com>
 kexec/arch/arm64/kexec-arm64.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kexec/arch/arm64/kexec-arm64.c b/kexec/arch/arm64/kexec-arm64.c
index a206c172b1aa..47df756bd595 100644
--- a/kexec/arch/arm64/kexec-arm64.c
+++ b/kexec/arch/arm64/kexec-arm64.c
@@ -540,6 +540,8 @@ static int setup_2nd_dtb(struct dtb *dtb, char *command_line, int on_crash)
 	dtb->buf = new_buf;
 	dtb->size = fdt_totalsize(new_buf);
+	dbgprintf("%s: found %s\n", __func__, dtb->path);
+	dump_fdt(dtb->buf);
 	return result;

More information about the kexec mailing list