Updating linksys befw1154 firmware
in order to get the correct wireless configuration created.For versions of the Open Wrt "brcm47xx" target prior to "Attitude Adjustment" 12.09-final, you may wish to use Broadcom's proprietary wl driver due to longstanding issues with the b43 driver in Linux kernel versions 2.6 and newer (https://dev.openwrt.org/ticket/7552).
For additional background information, see Linksys WRT54G series.
Connecting two which have 3.3V directly will work (TX - RX, RX - TX, GND - GND).
Standard RS-232 devices cannot be directly connected which accounts for nearly all serial PC devices.
Because these models have additional RAM and FLASH they do not suffer from the constraints of the WRT54G and WRT54GL series and can run all versions of Open WRT as of 11/1/2014.
*Tested WRT54GS v3.0 can run bcm47xx-legacy version of Open WRT 15.05.1 as of Aug 11, 2016.