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Merge pull request raspberrypi#702 from raspberrypi/revision-codes
Add revision codes page
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‎hardware/raspberrypi/README.md

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@@ -28,5 +28,7 @@ The hardware in the Raspberry Pi
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- How to access peripheral addresses using the bcm_host helpers
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- [Standard Conformity Documentation](conformity.md)
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- Conformance documentation for the various standards bodies
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- [Revision codes](revision-codes/README.md)
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- Raspberry Pi revision code reference
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‎hardware/raspberrypi/revision-codes/README.md

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# Raspberry Pi revision codes
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Each distinct Raspberry Pi model revision has a unique revision code. You can look up a Raspberry Pi's revision code by running:
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```bash
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cat /proc/cpuinfo
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```
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The last three lines show the hardware type, the revision code, and the Pi's unique serial number. For example:
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```
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Hardware : BCM2835
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Revision : a02082
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Serial : 00000000765fc593
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```
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*Note: As of the 4.9 kernel, all Pis report `BCM2835`, even those with BCM2836 and BCM2837 processors. You should not use this string to detect the processor.*
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## Old-style revision codes
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The first set of Raspberry Pi revisions were given sequential hex revision codes from `0002` to `0015`:
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| Code | Model | Revision | RAM | Manufacturer |
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| ---- | ----- | -------- | --------------- | ------------ |
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| 0002 | B | 1.0 | 256 MB | Egoman |
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| 0003 | B | 1.0 | 256 MB | Egoman |
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| 0004 | B | 2.0 | 256 MB | Sony UK |
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| 0005 | B | 2.0 | 256 MB | Qisda |
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| 0006 | B | 2.0 | 256 MB | Egoman |
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| 0007 | A | 2.0 | 256 MB | Egoman |
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| 0008 | A | 2.0 | 256 MB | Sony UK |
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| 0009 | A | 2.0 | 256 MB | Qisda |
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| 000d | B | 2.0 | 512 MB | Egoman |
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| 000e | B | 2.0 | 512 MB | Sony UK |
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| 000f | B | 2.0 | 512 MB | Egoman |
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| 0010 | B+ | 1.0 | 512 MB | Sony UK |
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| 0011 | CM1 | 1.0 | 512 MB | Sony UK |
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| 0012 | A+ | 1.1 | 256 MB | Sony UK |
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| 0013 | B+ | 1.2 | 512 MB | Embest |
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| 0014 | CM1 | 1.0 | 512 MB | Embest |
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| 0015 | A+ | 1.1 | 256 MB / 512 MB | Embest |
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## New-style revision codes
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With the launch of the Raspberry Pi 2, new-style revision codes were introduced. Rather than being sequential, each bit of the hex code represents a piece of information about the revision:
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```
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uuuuuuuuFMMMCCCCPPPPTTTTTTTTRRRR
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```
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| Part | Represents | Options |
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| -------- | ------------ | -------------------------- |
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| uuuuuuuu | Unused | Unused |
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| F | New flag | 1: new-style revision |
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| | | 0: old-style revision |
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| MMM | Memory size | 0: 256 MB |
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| | | 1: 512 MB |
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| | | 2: 1 GB |
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| CCCC | Manufacturer | 0: Sony UK |
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| | | 1: Egoman |
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| | | 2: Embest |
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| | | 3: Sony Japan |
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| PPPP | Processor | 0: BCM2835 |
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| | | 1: BCM2836 |
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| | | 2: BCM2837 |
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| TTTTTTTT | Type | 0: A |
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| | | 1: B |
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| | | 2: A+ |
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| | | 3: B+ |
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| | | 4: 2B |
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| | | 5: Alpha (early prototype) |
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| | | 6: CM1 |
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| | | 8: 3B |
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| | | 9: Zero |
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| | | a: CM3 |
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| | | c: Zero W |
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| RRRR | Revision | 0, 1, 2, etc. |
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New-style revision codes in use:
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| Code | Model | Revision | RAM | Manufacturer |
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| ------ | ----------------- | -------- | -------| ------------ |
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| 900021 | A+ | 1.1 | 512 MB | Sony UK |
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| 900032 | B+ | 1.2 | 512 MB | Sony UK |
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| 900092 | Zero | 1.2 | 512 MB | Sony UK |
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| 900093 | Zero | 1.3 | 512 MB | Sony UK |
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| 9000c1 | Zero W | 1.1 | 512 MB | Sony UK |
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| 920093 | Zero | 1.3 | 512 MB | Embest |
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| a01040 | 2B | 1.0 | 1 GB | Sony UK |
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| a01041 | 2B | 1.1 | 1 GB | Sony UK |
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| a02082 | 3B | 1.2 | 1 GB | Sony UK |
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| a020a0 | CM3 | 1.0 | 1 GB | Sony UK |
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| a21041 | 2B | 1.1 | 1 GB | Embest |
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| a22042 | 2B (with BCM2837) | 1.2 | 1 GB | Embest |
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| a22082 | 3B | 1.2 | 1 GB | Embest |
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| a32082 | 3B | 1.2 | 1 GB | Sony Japan |

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