The SunOS-like commands pwd, cd, and ls walk the PROM device tree to get to the device. The cd command must be used to establish a position in the tree before pwd will work. This example is from an Ultra-1 workstation with a cgsix frame buffer on an SBus.
ok cd /
To see the devices attached to the current node in the tree, use ls.
ok lsf006a064 SUNW,UltraSPARC@0,0 f00598b0 sbus@1f,0 f00592dc counter-timer@1f,3c00 f004eec8 virtual-memory f004e8e8 memory@0,0 f002ca28 aliases f002c9b8 options f002c880 openprom f002c814 chosen f002c7a4 packages
The full node name can be used:
ok cd sbus@1f,0ok lsf006a4e4 cgsix@2,0 f0068194 SUNW,bpp@e,c800000 f0065370 ledma@e,8400010 f006120c espdma@e,8400000 f005a448 SUNW,pll@f,1304000 f005a394 sc@f,1300000 f005a24c zs@f,1000000 f005a174 zs@f,1100000 f005a0c0 eeprom@f,1200000 f0059f8c SUNW,fdtwo@f,1400000 f0059ec4 flashprom@f,0 f0059e34 auxio@f,1900000 f0059d28 SUNW,CS4231@d,c000000
Rather than using the full node name in the previous example, you could have used an abbreviation. The abbreviated command line entry looks like this:
ok cd sbus
The name is actually device@slot,offset (for SBus devices). The cgsix device is in slot 2 and starts at offset 0. If an SBus device is displayed in this tree, the device has been recognized by the PROM.
The.properties command displays the PROM properties of a device. These can be examined to determine which properties the device exports (this is useful later to ensure that the driver is looking for the correct hardware properties). These are the same properties that can be retrieved with ddi_getprop(9F). See sbus(4) and "Properties" for related information.
ok cd cgsixok .propertiescharacter-set ISO8859-1 intr 00000005 00000000 interrupts 00000005 reg 00000002 00000000 01000000 dblbuf 00 00 00 00 vmsize 00 00 00 01 ...
The reg property defines an array of register description structures containing the following fields:
u_int bustype; /* cookie for related bus type*/ u_int addr; /* address of reg relative to bus */ u_int size; /* size of this register set */
For the cgsix example, the address is 0.