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Clarify requirements and add Linux instructions #33

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14 changes: 12 additions & 2 deletions README.md
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Expand Up @@ -269,11 +269,11 @@ a command line.

### What you need

- a Windows computer;
- a Windows computer for NeoProgrammer, or Linux for flashrom;
- a CH341A/CH341B programmer verified for 3.3 V operation;
- an SOIC-8 test clip and cable;
- a multimeter;
- NeoProgrammer;
- NeoProgrammer (Windows) or flashrom (Linux);
- [cc2camera installed](docs/INSTALLATION.md); the standalone Windows executable needs no Python or Git.

The CH341 worked with the flash still soldered on the tested camera. A Bus
Expand Down Expand Up @@ -357,6 +357,16 @@ Only after complete verification succeeds should you unplug the programmer,
remove the clip, reconnect the camera's normal cable, and test it in the
printer.

**Linux / CH341:** See the [flashrom procedure](hardware-recovery/PROGRAMMER_REFERENCE.md#linux-with-flashrom-and-ch341)
for chip identification, three verified backups and image building. After those
checks, these commands **write flash** and verify a complete readback:

```sh
flashrom -p ch341a_spi -c "SFDP-capable chip" -w cc2-camera-1-cc2-recovery/cc2-camera-recovery.bin &&
flashrom -p ch341a_spi -c "SFDP-capable chip" -r cc2-camera-readback.bin &&
cmp cc2-camera-1-cc2-recovery/cc2-camera-recovery.bin cc2-camera-readback.bin
```

## What the repair changes

Affected cameras repeatedly rewrite the same configuration files during every
Expand Down