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README: Explain printk in firmware

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@ -133,6 +133,16 @@ You can inject A-MPDUs using ModWifi by adding a special trailer to injected fra
The firmware will then automatically aggregate these three frames into an A-MPDU. For background, see the function [`modwifi_txampdu_check`](https://github.com/vanhoefm/modwifi-ath9k-htc/blob/research/target_firmware/wlan/if_owl.c#L1573).
#### Firmware Debugging
There is support to add short debug messages to the firmware. You can access these debug messages as follows:
root@ubuntu:~$ mount -t debugfs none /sys/kernel/debug
root@ubuntu:~$ cd /sys/kernel/debug/ieee80211/phy*/ath9k_htc/
root@ubuntu:~$ cat dmesg
In the firmware you can make calls to [printk](https://github.com/vanhoefm/modwifi-ath9k-htc/blob/f01cbd56f160bd3f593fb71324c424241ea604ad/target_firmware/wlan/attacks.c#L302) to debug the firmware. Because the firmware has a low amount of memory, it is recommended to only add short debug messages. The debug log is implemented as a ringbuffer on the firmware, meaning new debug messages will overwrite old messages to prevent running out of memory.
## Troubleshooting
If an attack or device is not working, you can try the following steps to get it working again: