OpenBoot performs the following steps during the boot process: (...) The bootpath and bootargs properties in the /chosen node of the device tree are set with the selected values.

TFTP Booting Support Package The /obp-tftp package implements the Internet Trivial File Transfer Protocol (TFTP) for use in network booting. It is typically used by a network device driver for its first stage network boot protocol. Again, load is the most important method defined by this package. This package uses the read and write methods of its parent, and defines the following methods: Table 4-5 TFTP Package Methods ---------------------------------------------------------------- Name Stack diagram Description ----------------------------------------------------------------- open (-- flag) Prepares the package for subsequent use, returning -1 if the operation succeeds and 0 otherwise. close (--) Frees all resources that were allocated by open. load (adr -- size) Reads the default stand-alone program from the default TFTP server, putting the program at memory address adr and returning its length size. For the standard Sun TFTP booting protocol, RARP (Reverse Address Resolution Protocol) is used to acquire the IP address corresponding to the system's MAC address (equivalent to its Ethernet address). From the IP address, the default file name is constructed, of the form <Hex-IP-Address>. <architecture> (for example, C0092E49.SUN4C). Then obp-tftp tries to TFTP read that file, first trying the server that responded to the RARP request, and if that fails, then broadcasting the TFTP read request. -------------------------------------------------------------------