FnH's Blog - 2008/5/18 - bricked_and_back_again
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Bricked and back again
Posted by FnH on 2008/5/18 17:52
Recently, Freyja wanted a laptop to replace her aging desktop PC. Given that it didn't have to do a whole lot more than reading mail, surfing the web and viewing the occasional DVD we settled for a slightly upgraded Dell Vostro 1000.
Problem: now that we had a laptop in our home we needed a wireless access point. One of our neighbours has an open access point - which we used to test the wireless by downloading some essentials - but that didn't seem to be a very good long-term solution.
Having some earlier experience flashing routers (I monkeyed around with a Netgear WGT634U once, soldering my own serial interface and all) I decided to go for the best supported flashable router out there: the Linksys WRT54GL. The WRT54GL doesn't have pins for a serial interface like the WGT634U, but it does have a boot_wait parameter you can set making it pause for new firmware to flash when booting, which comes in handy when you've done something that broke it. This makes it almost fool-proof and means you don't need a special serial interface to play around with it. I suspect this explains most of its popularity.
With Ezri constantly needing attention (eat, play, bath, bed) it was near midnight when I flashed and configured the router with a 2.6 kernel xwrt firmware. Unfortunately, the proprietary Broadcom drivers for the wireless card don't work with a 2.6 kernel and the open source drivers aren't fully functional yet, so I had to restart using an older 2.4 kernel. After midnight, sleepy and confident with how well everything was going, I grabbed a 2.4 kernel and flashed the router again. That killed it. I flashed it with the firmware for a WRT54GS instead of a WRT54GL and it didn't like that. Realizing I forgot to set the boot_wait parameter I feared there was no way I could flash the device back to life. Getting in bed I had to inform Freyja I probably bricked our brand new router.
Normally the router would've been dead unless I started soldering and created a serial interface, which would've been more effort than I wanted to spend on it this time around. Luckily google turned up some advice. With a bit of brain-surgery the router could be trapped into the low level CFE and accept new firmwares just as if boot_wait had been set. Figuring I had very little to lose I opened the router and booted it with a few pins of the flash module short-circuited. This did the trick and a few moments later it was back alive.
Now that I have a fully capable embedded linux device sitting in the store room I need to figure out what to do with it, except providing WPA2 secured wireless internet for Freyja's laptop, that is. I could make a bandwidth restricted public access point, but it seems my neighbour has that market segment covered already. I could use it to have some fun, or to break the 3 WEP encrypted access points that are hanging around, but I think I'll just leave it be and use it as a reliable access point ...