TS-4900 baseboard ID
All of our off the shelf baseboards contain a hard wired 3-state 8-input multiplexers. This is not required to implement in custom baseboards, with the TS-4900 it is used to pick the device tree. If a baseboard ID is not present, the default device tree would be loaded. During startup in u-boot, 4 DIO are used to obtain the baseboard model id using the bbdetect command. The red LED (CN2_06) is state 0, green LED (CN2_08) is state 1, BUS_DIR (CN1_98) is state 2, and BD_ID_DATA (CN1_83) is used for data.
The first 6 lines are used as the six bits that define the baseboard. The last two lines (Y6 & Y7 in the schematic image below) define the bits to indicate the board revision.
For custom baseboards we have reserved the address 42 which will never be used by our standard products.
| ID | Baseboard |
|---|---|
| 0 | TS-8200 |
| 1 | Reserved, do not use |
| 2 | TS-TPC-8390 |
| 4 | TS-8500 |
| 5 | TS-8400 |
| 6 | TS-8160 |
| 7 | TS-8100 |
| 8 | TS-8820-BOX |
| 9 | TS-8150 |
| 10 | TS-TPC-8900 |
| 11 | TS-8290 |
| 13 | TS-8700 |
| 14 | TS-8280 |
| 15 | TS-8380 |
| 16 | TS-AN20 |
| 17 | TS-TPC-8920 |
| 19 | TS-8550 |
| 20 | TS-TPC-8950 |
| 22 | TS-8551 |
| 42 | Reserved for customer use, never used by us |
| 63 | TS-8200 |