Compatibility/Safety in running Thibor 15c code on WRT54G?

Discussion in 'HyperWRT Firmware' started by Wifinator, Mar 28, 2008.

  1. Wifinator

    Wifinator Addicted to LI Member

    I'm looking for a little feedback on the compatibility/safety in running Thibor 15c on my trusty WRT54G hardware v. 2.0 router because I see it's based on the GS code instead of the G code.

    While I haven't had any problems after just upgrading to it, I'm just concerned about running the GS code on my G router.

    So my question is this: While I cleared the NVRAM both before and after, and I haven't encountered any problems, are there any problems with running a different hardware codebase on it? Either now or down the road when flashing to other firmware?

    I only ask because Linksys' site always has warned to use the firmware for that exact model, and they do have different firmware code for the G and GS router models.

    If anyone could shed some light on this for me, I'd really appreciate it.

    FYI, I previously used Hyperwrt 1.4 (Avenger) for the past several years and only needed to upgrade to a newer version when my new work BlackBerry wouldn't connect via WPA-PSK. T-Mobile has virtually no coverage at my home (I prefer Verizon), so I needed to connect it over Wi-Fi to use its UMA mode -- incredibly awesome!

    Upgrading to the latest stock Linksys 4.21.1 firmware solved my problem (chose stock firmware for a "clean test"). So I knew the problem was the old firmware. I then flashed to Thibor 15c to get back all the other enhancements, including the transmit power control I needed. Very cool.
  2. Wifinator

    Wifinator Addicted to LI Member

    Thibor, could you answer this?

    And thanks for the great firmware.
  3. HennieM

    HennieM Network Guru Member

    This is as I understand it (which is not necessarily true...)

    Firstly, Speedbooster (or, as Broadcom originally called it, Afterburner), is software functionality.
    The stock firmware for the G and GS is near identical. As the GS has more RAM than the G, the Afterburner code is enabled in the firmware for the GS.

    Third party firmware however, gives you the control: you can en/disable Afterburner.
    However, on G routers, enabling Afterburner might:
    i) not have an effect, as (I think) there's a ROM code somewhere that gets read by the firmware, which tells that it cannot run Afterburner, or
    ii) make the router run slow or bomb out quickly when it has to make many connections (as the RAM fills up quickly).

    Afterburner is overrated anyway, and only works in certain circumstances and when you have very good signal and Afterburner capable devices on both ends.

    You can check the autopsy on this site, but I think the V2 G has the same RAM as the later model GSs, so you should be fine if you want to use Afterburner.
  4. grcore

    grcore Network Guru Member

    Yeah, the afterburner is really the only difference. I disable it for compatibility reasons.

    It says GS, but that is just a string in the web UI.

  5. Wifinator

    Wifinator Addicted to LI Member


    Thanks HennieM and grcore. I was wondering what the heck Afterburner was for in the Advance Wireless Settings screen. Didn't know it was Speedbooster since I've never used a GS router. (Doh! :wink:)

    Right now it's set to "Auto", but I'm tempted to play with it as I have a G Speedbooster PCI card in one of my legacy desktop PCs. Will have to see what it does for compatibility with my other standard-G PCs.

    There's no mention of Afterburner in the router's help screen. "Disable" is self-explanatory, but what's the difference between "Auto" and "Enable"? For example, does Auto turn on Afterburner/Speedbooster only if it detects another Speedbooster card? Or something else?

    Thanks again for the explanation, very much appreciated!
  6. HennieM

    HennieM Network Guru Member

    Test. That's your best option. I found mixed results depending on the PC adapter, signal strength, etc., and sometimes on the "mood" of the router or adapter... I now have Afterburner/Speedbooster off or Auto on all 13 my WRTs - never ON. Make sure you have Frame Burst on - this makes a big difference.
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