Use the set-menu subcommand of the bootadm command to maintain the GRUB menu. For example, you can use the command to change the menu timeout and the default boot entry in the GRUB menu.
# bootadm list-menu
# bootadm set-menu [-P pool] [-R altroot [-p platform]] key=value
For more information about each value that can you can specify by using the set-menu subcommand, see the bootadm(1M) man page. Examples of common ways that you can use the set-menu subcommand follow this procedure.
# bootadm list-menu
Use the bootadm set-menu command with the appropriate key=value option to set the default entry number (for example, 0, 1, or 2) in the GRUB menu. This number designates which operating system is booted when the timer expires.
The following example sets the default boot entry as 2, which is Oracle Solaris 11.3:
# bootadm set-menu default=1 # bootadm list-menu The location of the boot loader configuration file is /rpool/boot/grub default 1 console graphics timeout 30 0 Oracle Solaris 11/11 1 Oracle Solaris 11.3 2 Oracle Solaris 11_test
In this example, the default menu entry is now 1. When the system is rebooted, it will automatically boot the new Oracle Solaris entry after the default timer expires.
You can also set the default entry in the GRUB menu by using the change-entry subcommand. See How to Set Attributes for a Specified Boot Entry in the GRUB Menu.Example 4 Changing the Menu Timeout Value in the GRUB Menu
Use the bootadm set-menu command with the appropriate key=value option to set the menu timeout value.
In the following example, the output of the bootadm list-menu command shows a default timeout value of 30 seconds that has been changed to 45 seconds. The change takes effect the next time the system is booted.
# bootadm list-menu The location of the boot loader configuration file is /rpool/boot/grub default 2 console graphics timeout 30 0 Oracle Solaris 11/11 1 Oracle Solaris 11.3 2 Oracle Solaris 11_test # bootadm set-menu timeout=45 # bootadm list-menu The location of the boot loader configuration file is /rpool/boot/grub default 2 console graphics timeout 45 0 Oracle Solaris 11/11 1 Oracle Solaris 11.3 2 Oracle Solaris 11_testExample 5 Setting the GRUB Console Type
One value that you can set by using the set-menu subcommand of the bootadm command is the console type. Changing the console type in this way persists over system reboots.
For example, you would set the console type to serial in the grub.cfg file, as follows:
# bootadm set-menu console=serial
You can also set the console type to text for plain text console. Choose this option if you are using BIOS serial redirection. Or, you can set the console type to graphics. This option provides a more graphical menu, and a background image is used.
When you set the console type to serial, you can configure the serial parameters that GRUB 2 uses when initializing the serial port at boot time. If you do not specify a serial_params value, the default is to use serial port 0 (COM1/ttya) and to not specify a speed. Note that if a speed is not specified and only a port is specified, for example, serial_params=0, then the speed that is used is undefined and will be whatever speed the serial port was initialized to before GRUB executes. If you to ensure a specific speed is used, they need to explicitly set it with serial_params.
Add the serial_params key value to the bootadm command line, as follows:
Is the port number. Any number from 0 to 3 (usually 0 is used for ttya or COM1) can be used to specify ports ttya through ttyd, or COM1 through COM4, respectively.
Is the speed that the serial port uses. If this value is omitted, GRUB 2 uses whatever speed the serial port has been initialized to use. If the serial port has not been initialized, failure to specify the speed might cause unpredictable output. If you are not sure if the serial port has been initialized, and you are not using BIOS console redirection, it is best to specify a speed value.
Is specified with a value of either 7 or 8.
Is specified as e, o, n (for even, odd, or none), respectively.
Is specified with a value of 0 or 1.
All of the serial parameters, with the exception of the port parameter, are optional.