larsth / c_raspberry_pi_revision

C code to decode the Revision: field of /proc/cpuinfo on the Raspberry Pi

raspberry_pi_revision

C function to decode the Revision: field of /proc/cpuinfo on the Raspberry Pi.

Known revisions

The file /proc/cpuinfo contains a line such as:-

Revision : 0003

Prior to Raspberry Pi 2

that holds the revision number of the Raspberry Pi. Known revisions (prior to the Raspberry Pi 2) are:

Revision	Model	PCB Rev	Memory	Manufacture
0000
0001
0002	B	1	256 MB
0003	B	1	256 MB
0004	B	2	256 MB	Sony
0005	B	2	256 MB	Qisda
0006	B	2	256 MB	Egoman
0007	A	2	256 MB	Egoman
0008	A	2	256 MB	Sony
0009	A	2	256 MB	Qisda
000a
000b
000c
000d	B	2	512 MB	Egoman
000e	B	2	512 MB	Sony
000f	B	2	512 MB	Qisda
0010	B+	1	512 MB	Sony
0011	compute	1	512 MB	Sony
0012	A+	1	256 MB	Sony
0013	B+	1	512 MB	Embest
0014	compute	1	512 MB	Sony
0015	A+	1	256 MB	Sony

If the Raspberry Pi has been over-volted (voiding the warranty) the revision number will have 100 at the front. e.g. 1000002.

Raspberry Pi 2 / Model Zero

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
C	12-15	Processor	BCM2835, BCM2836, BCM2837
D	16-19	Manufacturer	Sony, Egoman, Embest, unknown, Embest
E	20-22	Memory size	256 MB, 512 MB, 1024 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)
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)
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)
E - Memory - 2 (1024 MB)
F - Endcoded flag - 1 (encoded cpu info)