Here is how to decode the Sun Fire E25K IO Boat locations. This is useful if you are trying to jumpstart a domain that has multiple ethernet cards in it. (Note even if you only have 1 physical card, there are other “ethernet” devices on the back side for the MAN and I2 networks).
So lets take this example. Here is the out put of show-nets from a domain.
{80} ok show-nets
a) /pci@bd,700000/network@1
b) /pci@bc,700000/network@3,1
c) /pci@bc,700000/pci@1/network@1
d) /pci@bc,700000/pci@1/network@0
e) /pci@9d,700000/network@1
f) /pci@9c,700000/network@3,1
g) /pci@9c,700000/pci@1/network@1
h) /pci@9c,700000/pci@1/network@0
The first step is to convert the hexadecimal agent id into binary. The agent id in the above example (line h for reference) is 9c. So 9c in binary is 00 1001 1100. The last 5 bits identify the IOC chip. A value of 0x1c is IOC0, whereas 0x1d is IOC1. So in the above, the last 5 bits is 11100 = 1c. The remaining first 5 bits of the agent id converted from binary to decimal will tell you the expander board. So 00 100 = 4 in decimal. So from this we can tell that the network card is in Expander 4 and IOC 0.
Next is to identify the bus, that is the part after the , in the above example they are all 700000, which is bus B. Whereas 600000 is bus A.
Bus A is the 33/66-MHz, where as Bus B is the 33MHz.
So as you are looking at an IO expander the B bus is the top 2 slots, and the A bus is the bottom 2 slots. The IO bridge 0 is the right and the IO bridge 1 is the left side.
So in our example this Card is in the Top Right slot of the IO boat in expander board 4. Next since this card has 2 ports, you will see a network@0, and network@1. Which correspond to the port 0 and 1 on the card (which happens to be a dual port ethernet/scsi card).
Now that I have explained how it works, here is a quick cheat sheet:
| Device Agent ID | Expander board |
|---|---|
| 1c | 0 |
| 3c | 1 |
| 5c | 2 |
| 7c | 3 |
| 9c | 4 |
| bc | 5 |
| dc | 6 |
| fc | 7 |
| 11c | 8 |
| 13c | 9 |
| 15c | 10 |
| 17c | 11 |
| 19c | 12 |
| 1bc | 13 |
| 1dc | 14 |
| 1fc | 15 |
| 21c | 16 |
| 23c | 17 |