RouterBOARD SXT Series User's Manual rev. 6
address and the image name must be sent by the BOOTP/DHCP server).
To boot the RouterBOARD computer from Ethernet network you need the following:
● An ELF kernel image for the loader to boot from (you can embed the kernel parameters and initrd
image as ELF sections called kernparm and initrd respectively)
● A TFTP server which to download the image from
● A BOOTP/DHCP server (may be installed on the same machine as the TFTP server) to give an IP
address, TFTP server address and boot image name
See the Button Index section on how to configure loader to boot from network.
Note that you must connect the RouterBOARD you want to boot, and the BOOTP/DHCP and TFTP servers to
the same broadcast domain (ie., there must not be any routers between them).
RouterBOOT
The RouterBOOT firmware (also referred as “boot loader” here) provides minimal functionality to boot an
Operating System. RouterBOOT can be configured from the RouterOS “/system routerboard” menu. The
loader supports booting from the onboard NAND device and from a network server (see the respective
section for details on this protocol).
Boot Loader Configuration
As this device doesn't have a serial port, the Bootloader parameters may be configured through RouterOS
“/system routerboard” menu.
Boot Loader Upgrading
The boot loader is needed to initialize all the hardware and boot the system up. It's generally a good idea to
upgrade the loader once a newer RouterOS version is available.
The boot loader upgrading is supported from MikroTik RouterOS. Upload the FWF file to RouterOS files
menu, and run the “/system routerboard upgrade” command. Usually, RouterOS releases already include the
new Bootloader files in the routerboard.npk package, so if you have this package installed, you can check if
new Bootloader is available:
[admin@SXT] > system routerboard print
routerboard: yes
model: "SXT"
serial-number: "1FC201AD5C64"
current-firmware: "2.27"
upgrade-firmware: "2.29"
[admin@SXT] >
As you see in the above example, new firmware is available. Type the following command to
upgrade it:
[admin@SXT] > system routerboard upgrade
Operating System Support
Currently tested operating system is MikroTik RouterOS (starting from version v4.16). Downgrading the
device to older RouterOS versions can cause malfunction and License issues.
Connector Index
J4 RJ45 Fast Ethernet 100Base-TX port LAN1 with passive PoE extension
1 Data TX+
2 Data TX-
3 Data RX+
8