RouterBOARD 493 Series User's Manual
the [Delete] key to enter the setup – in this case it might be possible to do this with the [Backspace] key.
serial console
– to configure initial serial console bitrate (1200 | 2400 | 4800 | 9600 | 19200 | 38400 |
57600 | 115200;
115200
bps by default).
cpu-frequency
– CPU frequency (266MHz | 333MHz;
333MHz
by default on RB493. On RB493AH/G also
available 680MHz and 800MHz. 680MHz default).
boot device
– initial boot device (boot over Ethernet | boot from NAND | boot Ethernet once, then NAND;
boot from NAND
by default). You can also select
boot chosen device
option to boot from the device
selected immediately, without saving the setting.
reset configuration
– whether to reset all the boot loader settings to their respective default values (yes |
no;
no
by default).
format nand
– perform a low-level NAND format. During this operation, all previously marked bad sectors
are retested to find out if they are faulty indeed.
upgrade firmware
– receive a new boot loader image using XModem protocol over serial line or using
DHCP/BOOTP and TFTP protocols through the Ethernet network (upgrade firmware over ethernet | upgrade
firmware over serial port).
board info
– prints the serial number, boot loader version, CPU frequency, memory size and MAC addresses
of the onboard Ethernet ports
boot protocol
– network booting protocol (bootp protocol | dhcp protocol;
bootp protocol
by default).
do memory testing
– performs a full memory test.
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
The boot loader upgrading is supported also from MikroTik RouterOS. The procedure is described in the
MikroTik RouterOS manual.
Primary Boot Loader
There are two boot loaders present on the NOR flash memory chip. Secondary is the main one, that is
executed by default. This is the one that can be upgraded. In case something goes wrong in the upgrade
process, or you have set some incorrect settings that render it unusable, you can load the Primary boot
loader by holding the Software Reset 1 button (
S1
) or jumper (
JP301
), connecting the power, and then
releasing the button/jumper. The Primary boot loader has the default settings, which can not be changed. It
is also not possible to upgrade it.
RouterOS on RouterBOARD 493
Health monitor
This menu shows the current input voltage and fan status.
[admin@MikroTik] > system health print
fan-mode: manual
use-fan: main
active-fan: main
voltage: 18.8
[admin@MikroTik] >
fan-mode
– whether to use automatic fan failover (auto | manual;
manual
by default).
use-fan
– which fan to use in manual mode (main | auxiliary;
main
by default).
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