C function to decode the Revision: field of /proc/cpuinfo on the Raspberry Pi.
The file /proc/cpuinfo contains a line such as:-
Revision : 0003
that holds the revision number of the Raspberry Pi. Known revisions (prior to the Raspberry Pi 2) are:
| Revision | Model | PCB Rev | Memory | Manufacturer |
|---|---|---|---|---|
| 0000 | ||||
| 0001 | ||||
| 0002 | B | 1 | 256 MB | Egoman |
| 0003 | B | 1 | 256 MB | Egoman |
| 0004 | B | 2 | 256 MB | Sony UK |
| 0005 | B | 2 | 256 MB | Qisda |
| 0006 | B | 2 | 256 MB | Egoman |
| 0007 | A | 2 | 256 MB | Egoman |
| 0008 | A | 2 | 256 MB | Sony UK |
| 0009 | A | 2 | 256 MB | Qisda |
| 000a | ||||
| 000b | ||||
| 000c | ||||
| 000d | B | 2 | 512 MB | Egoman |
| 000e | B | 2 | 512 MB | Sony UK |
| 000f | B | 2 | 512 MB | Egoman |
| 0010 | B+ | 1 | 512 MB | Sony UK |
| 0011 | compute | 1 | 512 MB | Sony UK |
| 0012 | A+ | 1 | 256 MB | Sony UK |
| 0013 | B+ | 1 | 512 MB | Embest |
| 0014 | compute | 1 | 512 MB | Embest |
| 0015 | A+ | 1 | 256 MB | Embest |
| 0015 | A+ | 1 | 512 MB | Embest |
If the Raspberry Pi has been over-volted (voiding the warranty) the revision number will have 100 at the front. e.g. 1000002.
With the release of the Raspberry Pi 2, there is a new encoding of the Revision field in /proc/cpuinfo. The bit fields are as follows
FEDC |
BA98 |
7654 |
3210 |
FEDC |
BA98 |
7654 |
3210 |
|---|---|---|---|---|---|---|---|
HG |
FEEE |
DDDD |
CCCC |
BBBB |
BBBB |
AAAA |
|
1098 |
7654 |
3210 |
9876 |
5432 |
1098 |
7654 |
3210 |
| # | bits | contains | values |
|---|---|---|---|
| A | 00-03 | PCB Revision | (the pcb revision number) |
| B | 04-11 | Model name | A, B, A+, B+, B Pi2, Alpha, Compute Module, unknown, Pi3, Zero, Compute Module 3, unknown, Zero W, Pi3+, 3A+, unknown, Compute Module 3+, Pi4, Zero 2 W, Compute Module 4, 400, Compute Module 4S, unknown, Pi5 |
| C | 12-15 | Processor | BCM2835, BCM2836, BCM2837, BCM2711, BCM2712 |
| D | 16-19 | Manufacturer | Sony UK, Egoman, Embest, Sony Japan, Embest, Stadium |
| E | 20-22 | Memory size | 256 MB, 512 MB, 1024 MB, 2048 MB, 4096 MB, 8192 MB |
| F | 23-23 | encoded flag | (if set, revision is a bit field) |
| G | 24-24 | waranty bit | (if set, warranty void - Pre Pi2) |
| H | 25-25 | waranty bit | (if set, warranty void - Post Pi2) |
Also, due to some early issues the warranty bit has been move from bit 24 to bit 25 of the revision number (i.e. 0x2000000).
e.g.
Revision : A01041
A - PCB Revision - 1 (first revision)
B - Model Name - 4 (Model B Pi 2)
C - Processor - 1 (BCM2836)
D - Manufacturer - 0 (Sony UK)
E - Memory - 2 (1024 MB)
F - Endcoded flag - 1 (encoded cpu info)
Revision : A21041
A - PCB Revision - 1 (first revision)
B - Model Name - 4 (Model B Pi 2)
C - Processor - 1 (BCM2836)
D - Manufacturer - 2 (Embest)
E - Memory - 2 (1024 MB)
F - Endcoded flag - 1 (encoded cpu info)
Revision : 900092
A - PCB Revision - 2 (second revision)
B - Model Name - 9 (Model Zero)
C - Processor - 0 (BCM2835)
D - Manufacturer - 0 (Sony UK)
E - Memory - 1 (512 MB)
F - Endcoded flag - 1 (encoded cpu info)
Revision : A02082
A - PCB Revision - 2 (second revision)
B - Model Name - 8 (Model B Pi 3)
C - Processor - 2 (BCM2837)
D - Manufacturer - 0 (Sony UK)
E - Memory - 2 (1024 MB)
F - Endcoded flag - 1 (encoded cpu info)
Revision : A52082
A - PCB Revision - 2 (second revision)
B - Model Name - 8 (Model B Pi 3)
C - Processor - 2 (BCM2837)
D - Manufacturer - 5 (Stadium)
E - Memory - 2 (1024 MB)
F - Endcoded flag - 1 (encoded cpu info)
Revision : B03111
A - PCB Revision - 1 (first revision)
B - Model Name - 17 (Model B Pi 4)
C - Processor - 3 (BCM2711)
D - Manufacturer - 0 (Sony UK)
E - Memory - 3 (2048 MB)
F - Endcoded flag - 1 (encoded cpu info)