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[POWERPC] Export flat device tree via debugfs for debugging

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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
1 changed files with 25 additions and 0 deletions
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25
arch/powerpc/kernel/prom.c
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@ -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