[PATCH] Dump flat device tree before scanning
Michael Ellerman
michael at ellerman.id.au
Tue Aug 16 18:13:56 EST 2005
Hi,
This patch is just for people debugging flat device tree code. It dumps the
content of the device tree before scanning it, giving you a chance to look
over things before it all blows up.
I also have a python script that will turn this into something dtc can read,
if anyone wants it.
You need some sort of early debugging enabled to see anything BTW. See setup.c
cheers
# Bazaar-NG changeset v0.0.5
#
# committer: Michael Ellerman <michael at concordia>
# date: Tue 2005-08-16 17:54:46.513325930 +1000
# message:
# Add dumping of flat DT in prom.c
#
--- orig/arch/ppc64/kernel/prom.c
+++ mod/arch/ppc64/kernel/prom.c
@@ -1218,6 +1218,31 @@
#endif
}
+#ifdef DEBUG
+static void dump_flat_dt(char *p)
+{
+ struct boot_param_header *hdr = (struct boot_param_header*)p;
+ unsigned char buf[64];
+ int i, j;
+
+ DBG("Dumping flat dt ...\n");
+
+ for (i = j = 0; i < hdr->totalsize; i += 2) {
+ if (i % 4 == 0)
+ j += snprintf(buf + j, sizeof(buf) - j, " ");
+
+ if (i % 16 == 0) {
+ DBG("%s\n", buf);
+ j = 0;
+ }
+
+ j += snprintf(buf + j, sizeof(buf) - j,
+ "%.2x%.2x ", p[i], p[i + 1]);
+ }
+ DBG("%s\n", buf);
+}
+#endif
+
void __init early_init_devtree(void *params)
{
DBG(" -> early_init_devtree()\n");
@@ -1227,6 +1252,10 @@
/* By default, hash size is not set */
ppc64_pft_size = 0;
+
+#ifdef DEBUG
+ dump_flat_dt((char *)params);
+#endif
/* Retreive various informations from the /chosen node of the
* device-tree, including the platform type, initrd location and
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