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# Device Tree Module
This is a simple kernel module which show cases some of the kernel API functions
for manipulating device tree nodes.
In order to build this module you need either a local build of the Linux kernel,
or the the source that you can get from your Linux distribution (e.g.
`kernel-source` on openSUSE). For the former you will need to specify the path
to your local development tree with the `KERNEL` variable. So:
```
$ make KERNEL=<path/to/development/tree>
```
This will produce a `dtm.ko` file, which you will need to `insmod` on your
target machine. Then you will get this output from `dmesg`:
```
[ 571.298548] [ T813] dtm: loading out-of-tree module taints kernel.
[ 571.305842] [ T813] Inside of VisionFive2
[ 571.309945] [ T813] RISC-V ISA for 'cpu@1': rv64imafdc_zba_zbb
[ 571.315826] [ T813] parent: cpus
[ 571.319091] [ T813] RISC-V ISA for 'cpu@2': rv64imafdc_zba_zbb
[ 571.324962] [ T813] parent: cpus
[ 571.328224] [ T813] RISC-V ISA for 'cpu@3': rv64imafdc_zba_zbb
[ 571.334092] [ T813] parent: cpus
[ 571.337354] [ T813] RISC-V ISA for 'cpu@4': rv64imafdc_zba_zbb
[ 571.343228] [ T813] parent: cpus
```
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