add examples to README.md

README.md

@@ -4,3 +4,96 @@
 
 Manages features specific to [raspberrypi](https://www.raspberrypi.org/) and
 related fruit flavored hardware.
+
+## /boot/cmdline.txt
+
+### puppet
+
+```puppet
+class { 'pi::cmdline':
+  reboot     => false,  # reboots are problematic for acceptance testing
+  parameters => {
+    'coherent_pool=1M'     => {},
+    'bcm2708_fb.fbwidth=0' => {},
+    'bcm2708_fb.fbswap=1'  => {},
+  },
+}
+
+pi::cmdline::parameter { '8250.nr_uarts=0': }
+pi::cmdline::parameter { 'coherent_pool=1M': }
+pi::cmdline::parameter { 'snd_bcm2835.enable_headphones=0': }
+```
+
+### hiera
+
+```yaml
+pi::cmdline::reboot: false
+pi::cmdline::parameters:
+  coherent_pool=1M: {}
+  bcm2708_fb.fbwidth=0: {}
+  bcm2708_fb.fbswap=1: {}
+  8250.nr_uarts=0: {}
+  coherent_pool=1M: {}
+  snd_bcm2835.enable_headphones=0: {}
+```
+
+## /boot/config.txt
+
+### puppet
+
+```puppet
+class { 'pi::config':
+  reboot    => false,  # reboots are problematic for acceptance testing
+  fragments => {
+    'dtoverlay=pps-gpio,gpiopin=4' => {
+      'order' => 99,
+    },
+    'dtparam=i2c_arm=on'           => {
+      'order' => 1,
+    },
+    'dtparam=spi=on'               => {},
+    'serial port'                  => {
+      # lint:ignore:strict_indent
+      'content' => @("CONTENT"),
+        enable_uart=1
+        init_uart_baud=9600
+        | CONTENT
+      # lint:endignore
+    },
+  },
+}
+
+pi::config::fragment { 'disable_overscan=1': }
+pi::config::fragment { 'dtparam=audio=on':
+  order => 1,
+}
+pi::config::fragment { 'hdmi_mode=1':
+  order => 99,
+}
+pi::config::fragment { 'foo':
+  content => "hdmi_safe=1\n",
+}
+```
+
+### hiera
+
+```yaml
+pi::config::reboot: false
+pi::config::fragments:
+  dtoverlay=pps-gpio,gpiopin=4':
+    order: 99
+  dtparam=i2c_arm=on:
+    order: 1
+  dtparam=spi=on: {}
+  'serial port':
+    content: |
+      enable_uart=1
+      init_uart_baud=9600
+  disable_overscan=1:  {}
+  dtparam=audio=on:
+    order: 1
+  hdmi_mode=1:
+    order: 99
+  foo:
+    content: "hdmi_safe=1\n"
+```