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Apr 15, 2020
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Update README.md #1370

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Update README.md
JamesH65 Jan 3, 2020
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JamesH65 Jan 3, 2020
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lurch Feb 25, 2020
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JamesH65 Mar 9, 2020
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JamesH65 Mar 9, 2020
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lurch Mar 17, 2020
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34 changes: 23 additions & 11 deletions hardware/raspberrypi/revision-codes/README.md
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Expand Up @@ -18,10 +18,10 @@ Serial : 00000000765fc593

## Old-style revision codes

The first set of Raspberry Pi revisions were given sequential hex revision codes from `0002` to `0015`:
The first set of Raspberry Pi models were given sequential hex revision codes from `0002` to `0015`:

| Code | Model | Revision | RAM | Manufacturer |
| ---- | ----- | -------- | --------------- | ------------ |
| Code | Model | Revision | RAM | Manufacturer |
| ---- | ----- | -------- | -------------- | ------------ |
| 0002 | B | 1.0 | 256MB | Egoman |
| 0003 | B | 1.0 | 256MB | Egoman |
| 0004 | B | 2.0 | 256MB | Sony UK |
Expand All @@ -38,26 +38,35 @@ The first set of Raspberry Pi revisions were given sequential hex revision codes
| 0012 | A+ | 1.1 | 256MB | Sony UK |
| 0013 | B+ | 1.2 | 512MB | Embest |
| 0014 | CM1 | 1.0 | 512MB | Embest |
| 0015 | A+ | 1.1 | 256MB/512MB | Embest |
| 0015 | A+ | 1.1 | 256MB/512MB | Embest |

## New-style revision codes

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:

```
uuuuuuuuFMMMCCCCPPPPTTTTTTTTRRRR
NOQuuuWuFMMMCCCCPPPPTTTTTTTTRRRR
```

| Part | Represents | Options |
| -------- | ------------ | -------------------------- |
| uuuuuuuu | Unused | Unused |
| N | Overvoltage | 0: Overvoltage allowed |
| | | 1: Overvoltage disallowed |
| O | OTP Program<sup>1</sup> | 0: OTP programming allowed |
| | | 1: OTP programming disallowed |
| Q | OTP Read<sup>1</sup> | 0: OTP reading allowed |
| | | 1: OTP reading disallowed |
| uuu | Unused | Unused |
| W | Warranty bit | 0: Warranty is intact |
| | | 1: Warranty has been voided by [overclocking](../../../configuration/config-txt/overclocking.md) |
| u | Unused | Unused |
| F | New flag | 1: new-style revision |
| | | 0: old-style revision |
| MMM | Memory size | 0: 256MB |
| | | 1: 512MB |
| | | 2: 1GB |
| | | 3: 2GB |
| | | 4: 4GB |
| MMM | Memory size | 0: 256MB |
| | | 1: 512MB |
| | | 2: 1GB |
| | | 3: 2GB |
| | | 4: 4GB |
| CCCC | Manufacturer | 0: Sony UK |
| | | 1: Egoman |
| | | 2: Embest |
Expand Down Expand Up @@ -86,6 +95,9 @@ uuuuuuuuFMMMCCCCPPPPTTTTTTTTRRRR
| | | 11: 4B |
| RRRR | Revision | 0, 1, 2, etc. |

<sup>1</sup> Information on programming the OTP bits can be found [here](../../industrial/README.md) and [here](../otpbits.md).


New-style revision codes in use:

| Code | Model | Revision | RAM | Manufacturer |
Expand Down