[POWERPC] Export flat device tree via debugfs for debugging

If DEBUG is turned on in prom.c, export the flat device tree via debugfs.
This has been handy on several occasions.

To look at it:
 # mount -t debugfs none /sys/kernel/debug
 # od -a /sys/kernel/debug/powerpc/flat-device-tree
 and/or
 # dtc -fI dtb /sys/kernel/debug/powerpc/flat-device-tree -O dts

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2006-06-23 18:16:03 +10:00 committed by Paul Mackerras
parent 1dce0e3047
commit 7a4571ae55

View File

@ -30,6 +30,7 @@
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/kexec.h>
#include <linux/debugfs.h>
#include <asm/prom.h>
#include <asm/rtas.h>
@ -2148,3 +2149,27 @@ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
}
return NULL;
}
#ifdef DEBUG
static struct debugfs_blob_wrapper flat_dt_blob;
static int __init export_flat_device_tree(void)
{
struct dentry *d;
d = debugfs_create_dir("powerpc", NULL);
if (!d)
return 1;
flat_dt_blob.data = initial_boot_params;
flat_dt_blob.size = initial_boot_params->totalsize;
d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
d, &flat_dt_blob);
if (!d)
return 1;
return 0;
}
__initcall(export_flat_device_tree);
#endif