FreshTomato Wiki

The Debugging page helps you tweaking some parameter to allow you to better troubleshoot any issue you might be experiencing with your router.

Avoid performing an NVRAM commit: This option prevents any nvram (configuration) modification. Essentially any modified value + save would not be permanent.
Enable cprintf output to console:
Enable cprintf output to /tmp/cprintf:
Enable DDNS output to /tmp/mdu-*:This option allows the diagnostic of the DDNS client to be fully logged under /tmp/
Enable segfault logging:By default segfault errors are not logged into syslog facility, enabling this option you make this happen.
Count cache memory and buffers as free memory:On by default, it has to do with the way Linux handles RAM allocation which is split in Used+cache+buffer. Enabling this option cache and buffer are counted as free.
Avoid displaying LAN to router connections:Enabling this option will prevent LAN connections from the CONNTRACK related info e.g. QoS/View Details.

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Kernel printk log level:
Do not restart the following process if they die: crond/dnsmasq/hotplug2/igmprt: Usually dying processes are automatically restarted in FreshTomato. In some exceptional case you might want to prevent this from happening.
Set “no-cache” in httpd header:One of the most common issue especially after upgrading the firmware is cached browser content that creates errors/issues on the GUI. Usually reloading the interface via CTRL+F5 forces a cache-flush but an alternative is to set this parameter and instruct the browser not to perform any caching while on the FT's administration pages.