ExternalVendorCode/modwifi
1
0
Fork 0
mirror of https://github.com/vanhoefm/modwifi.git synced 2024-12-19 21:58:15 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

README: Explain printk in firmware

Browse Source
This commit is contained in:
vanhoefm 2022-06-10 19:03:01 +02:00 committed by GitHub
parent bcac98b629
commit cb9e3cff73
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
README.md
View File

@ -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). 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 ## Troubleshooting
If an attack or device is not working, you can try the following steps to get it working again: If an attack or device is not working, you can try the following steps to get it working again: