CHIP

The CHIP tag is a 16-bit unsigned integer that denotes the type of chip the firmware is to be installed to. It is one of the few tags that is not read from the fuses, but is instead hardcoded in the bootchain. It is used to prevent incompatible firmwares from being installed; different processors may have their MMIO registers in different locations.

Processors
The values are created by taking the four digits from the processor's model number, and encoding them in BCD.

"Legacy" Processors

 * S5L8900: 0x8900
 * S5L8720: 0x8720
 * S5L8920: 0x8920
 * S5L8922: 0x8922

Apple "A" Series

 * S5L8930 (A4): 0x8930
 * S5L8940 (A5): 0x8940
 * S5L8942 (A5 Rev A): 0x8942
 * S5L8945 (A5X): 0x8945
 * S5L8947 (A5 Rev B): 0x8947
 * S5L8950 (A6): 0x8950
 * S5L8955 (A6X): 0x8955
 * S5L8960 (A7): 0x8960
 * S5L8965 (A7): 0x8960 (the exception to the encoding rule above)
 * T7000 (A8): 0x7000
 * T7001 (A8X): 0x7001
 * S8000 (A9 Samsung): 0x8000
 * S8001 (A9X): 0x8001
 * S8003 (A9 TSMC): 0x8003
 * T8010 (A10 Fusion): 0x8010
 * T8011 (A10X Fusion): 0x8011
 * T8015 (A11 Bionic): 0x8015
 * T8020 (A12 Bionic): 0x8020
 * T8027 (A12X and A12Z Bionic): 0x8027
 * T8030 (A13 Bionic): 0x8030
 * T8101 (A14 Bionic): 0x8101
 * T8110 (A15 Bionic): 0x8110
 * T8120 (A16 Bionic): 0x8120

"S" and "T" Series

 * S7002 (S1): 0x7002
 * T8002 (S1P, S2, and T1): 0x8002
 * T8004 (S3): 0x8004
 * T8006 (S4 and S5): 0x8006
 * T8012 (T2): 0x8012
 * T8301 (S6): 0x8301

"H" Series

 * T2002 (H1): 0x8194

Recovery Mode string
If you connect a device in Recovery Mode to your computer, there is a small section in the device's USB "serial number" that contains the CPID, among other information.