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| author | Michael Ellerman <michael@ellerman.id.au> | 2006-06-23 18:16:03 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-06-28 11:59:46 +1000 |
| commit | 7a4571ae553e2972b7958306fd796a2fd24fd7d1 (patch) | |
| tree | 62111278b4bf452e1c481a2e662b910758b8d123 | |
| parent | 1dce0e30471ac863fd141d137c98e3644817975e (diff) | |
| download | op-kernel-dev-7a4571ae553e2972b7958306fd796a2fd24fd7d1.zip op-kernel-dev-7a4571ae553e2972b7958306fd796a2fd24fd7d1.tar.gz | |
[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>
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 483455c..efed4bc 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -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 |
