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	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.

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, 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)

No revision match for new Raspberry Pi 4 Model B Rev 1.5

Hi Andrew,

I find your little programs quite useful, am using them since 2017 :-)

Just wanted to let you know that in the version of current master, ./table does not show a quite new revision of a current RP4 model.
Moreover, there is a mismatch between /proc/cpuinfo and ./test.

Output of /proc/cpuinfo is

Hardware        : BCM2835
Revision        : c03115
Serial          : 10000000f8b73778
Model           : Raspberry Pi 4 Model B Rev 1.5

Output of ./test does not match CPU and model name of CPU info, but correctly reports manufacturer and RAM

memory: 4096 MB
processor: Broadcom BCM2711
i2cDevice: /dev/i2c-1
model: Raspberry Pi 4 Model B
manufacturer: Sony UK
pcb revision: 5
warranty void: no
revision: c03115
peripheral base: 0xFE000000

I have got viewed the code, but did not get through it deep enough to feel save to extend it by the required data without breaking sth.
Otherwise I would have tried and put a pull request...

andrewfrommelbourne / raspberry_pi_revision Goto Github PK