ibm,opal/flash device tree entries

The flash@<n> nodes under ibm,opal describe flash devices that can be accessed through the OPAL_FLASH_{READ,ERASE,WRITE} interface.

These interfaces take an ‘id’ parameter, which corresponds to the ibm,opal-id property of the node.

The properties under a flash node are:

  • compatible = "ibm,opal-flash"

ibm,opal-id = <id>

provides the index used for the OPAL_FLASH_XXX calls to reference this flash device

reg = <0 size>

the offset and size of the flash device


the read/write/erase block size for the flash interface. Calls to read/write/erase must be aligned to the block size.

#address-cells = <1>, #size-cells = <1>

flash devices are currently 32-bit addressable

If valid partitions are found on the flash device, then partition@<offset> sub-nodes are added to the flash node. These match the Linux binding for flash partitions; the reg parameter contains the offset and size of the partition.


flash@0 {
  reg = <0x0 0x4000000>;
  compatible = "ibm,opal-flash";
  ibm,opal-id = <0x0>;
  ibm,flash-block-size = <0x1000>;
  #address-cells = <0x1>;
  phandle = <0x100002bf>;
  #size-cells = <0x1>;