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add xHCI host dead troubleshooting #577

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add xHCI host dead troubleshooting #577

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add kernel xHCI dead troubleshooting
XMRHRX Jul 6, 2024
38deec4
add kernel xHCI dead troubleshooting
XMRHRX Jul 6, 2024
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37 changes: 37 additions & 0 deletions f3discovery/src/appendix/1-general-troubleshooting/README.md
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Expand Up @@ -216,3 +216,40 @@ $ rustup update nightly

$ rustup target add thumbv7em-none-eabihf
```

## Kernel problems

### lsusb don't show STM32F after STM32F got stuck, even reconnect

#### Symptoms

Sometime you might make STM32 freeze, and it lost connect even if you reconnect the USB

and got something like these in `dmesg`:

```
[ 700.256746] xhci_hcd 0000:06:00.4: xHCI host not responding to stop endpoint command
[ 700.260711] xhci_hcd 0000:06:00.4: xHCI host controller not responding, assume dead
[ 700.260711] xhci_hcd 0000:06:00.4: HC died; cleaning up
```

#### Cause

STM32 got freezed, kernel can not get the response from it, so remove it.
Reconnect USB port won't make kernet to try connect it again.

#### Fix

Linux:

- Get the ID from `dmesg`, the id is "0000:06:00.4" for below example:

```
[ 700.256746] xhci_hcd 0000:06:00.4: xHCI host not responding to stop endpoint command
[ 700.260711] xhci_hcd 0000:06:00.4: xHCI host controller not responding, assume dead
[ 700.260711] xhci_hcd 0000:06:00.4: HC died; cleaning up
```

- go to `/sys/bus/pci/drivers/xhci_hcd/`
- unbind it with ID, `echo -n "0000:06:00.4" > unbind`
- rebind it, `echo -n "0000:06:00.4" > bind`
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