RouterBOARD 500 Series User's Manual
cycle. It is still possible, however, that the board is not working properly on the frequency you've applied, so
the default (266MHz) CPU frequency can be restored. To do that, power the board with the S1 button
pressed, then unplug the power, and when you will turn the board on again, it will have CPU frequency set to
266MHz temporarily, so you will have to apply that frequency by issuing the keep cpu frequency command
in the loader configuration prompt.
Boot Loader Upgrading
The boot loader is needed to initialize all the hardware and boot the system up. Newer loader versions might
have support for more hardware, so it's generally a good idea to upgrade the loader once a newer version is
available. You can upgrade the loader through the onboard serial port using XModem protocol (programs
available for all major OSs). For example, you can use HyperTerminal for Windows or Minicom for Linux to
upload the boot loader. Alternatively if you have a DHCP/BOOTP and TFTP servers available, you can specify
the loader image as a boot image and choose the bios upgrade over ethernet option in the boot loader
configuration menu. The loader will get the image from the TFTP server and upgrade itself. The most current
loader image is available for download on www.routerboard.com.
If you are using a Microsoft Windows series operating system, you can use the remote upgrading application
available on www.routerboard.com. This program boots the RouterBOARD from network and upgrades the
loader. Note that the upgrade may only take place within the same broadcast domain (i.e. there must not be
any routers between the Windows-based machine and the upgradable RouterBOARD).
You can download from www.routerboard.com a special disk image (this image is a standard raw image you
can write on a CompactFlash with a program like PhysDiskWrite for Windows or dd for UNIX/Linux), which
you can use to boot the RouterBOARD from. This program will upgrade the loader to the latest version.
The boot loader upgrading is supported also from MikroTik RouterOS. The procedure is described in the
MikroTik RouterOS manual.
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