diff options
Diffstat (limited to 'roms/skiboot/doc/device-tree/ibm,opal/sysparams.rst')
| -rw-r--r-- | roms/skiboot/doc/device-tree/ibm,opal/sysparams.rst | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/roms/skiboot/doc/device-tree/ibm,opal/sysparams.rst b/roms/skiboot/doc/device-tree/ibm,opal/sysparams.rst new file mode 100644 index 000000000..8b74650db --- /dev/null +++ b/roms/skiboot/doc/device-tree/ibm,opal/sysparams.rst @@ -0,0 +1,38 @@ +.. _device-tree/ibm,opal/sysparams: + +sysparams +========= + +.. code-block:: c + + /* System parameter permission */ + enum OpalSysparamPerm { + OPAL_SYSPARAM_READ = 0x1, + OPAL_SYSPARAM_WRITE = 0x2, + OPAL_SYSPARAM_RW = (OPAL_SYSPARAM_READ | OPAL_SYSPARAM_WRITE), + }; + + +.. code-block:: dts + + sysparams { + compatible = "ibm,opal-sysparams"; + param-id = <0xf0000001 0xf0000003 0xf0000012 0xf0000016 0xf000001d 0xf0000023 0xf0000024 0xf0000025 0xf0000026 0xf0000027>; + param-name = "surveillance", "hmc-management", "cupd-policy", "plat-hmc-managed", "fw-license-policy", "world-wide-port-num", "default-boot-device", "next-boot-device", "console-select", "boot-device-path"; + param-perm = [03 01 03 03 03 02 03 03 03 03]; + phandle = <0x10000032>; + param-len = <0x4 0x4 0x4 0x4 0x4 0xc 0x1 0x1 0x1 0x30>; + linux,phandle = <0x10000032>; + }; + +Device tree node for system parameters accessible through the +:ref:`opal-sysparams` calls :ref:`OPAL_GET_PARAM` and :ref:`OPAL_SET_PARAM`. + +While many systems and platforms will support parameters and configuration via +either nvram or over IPMI, some platforms may have parameters that need to be +set a different way. + +Some parameters may be set Read Only, so the `param-perm` property indicates +permissions. + +Currently, this is only something that exists on FSP based systems. |