11/11/2023 0 Comments Minicom mac meta key![]() Kernel's output can be sent to serial console by setting the console= kernel parameter. Read Syslinux Wiki:Config#SERIAL for the directive's options. The serial parameters are hardcoded to 8 bits, no parity and 1 stop bit. To enable serial console in Syslinux, edit syslinux.cfg and add SERIAL as the first directive in the configuration file.įor COM1 ( /dev/ttyS0) with baud rate of 115200 bit/s: REFInd supports serial console only in text mode. If no key is pressed, the boot menu will appear on whichever (serial or console) appears first in the terminal configuration line. ![]() Note: When the terminal -timeout=5 serial console line is added to your menu.lst, your boot sequence will now show a series of Press any key to continue messages. In order to revert those changes - just reinstall GRUB using grub-install command.Įdit the GRUB Legacy configuration file /boot/grub/menu.lst and add these lines to the general area of the configuration: # grub-bios-setup -d /boot/grub/i386-pc/ /dev/YOUR_BOOT_DISK On BIOS platforms like i386-pc (for EFI platforms just skip this step) run the following command to install new core.img to your system: Run grub-mkimage with these parameters.Ħ. Remove paramters with empty arguments (like -dtb and -sbat ) and add serial and terminal modules to the end of the grub-mkimage parameters list.ĥ. Replace -config '/boot/grub/PLATFORM/load.cfg' to -config '/boot/grub/PLATFORM/early-grub.cfg' Edit grub-mkimage parameters from step 1 (the grub-install output): Add the following lines at the beginning of /boot/grub/PLATFORM/early-grub.cfg (change those lines according to desired configuration as described above):Ĥ. Copy /boot/grub/PLATFORM/load.cfg to /boot/grub/PLATFORM/early-grub.cfgģ. You can reboot the system to check if it boots properly, but you should save the output of the commahd above - it will be hecessary at step 4.Ģ. # grub-install -verbose /dev/YOUR_BOOT_DISK 2>&1 | grep grub-mkimage # grub-install -verbose 2>&1 | grep grub-mkimage Run the following command to generate /boot/grub/PLATFORM/load.cfg and see the correct grub-mkimage parameters for your system: ![]() ![]() To get the GRUB cryptodisk password prompt on the serial console a few extra configuration steps are required:ġ. The /boot/grub/PLATFORM/load.cfg file gets overwritten each time grub-install is launched. This happens because the grub-install has special behavior for GRUB_ENABLE_CRYPTODISK=y and will create early config placed in /boot/grub/PLATFORM/load.cfg but grub-install ignores serial console configuration from /etc/default/grub for GRUB first stage. When GRUB is installed to an encrypted /boot/ partition - GRUB first stage (core.img) will show Enter passphrase for hdX,gptY: password prompt only on platform console and will not show anything in serial console even if all serial console configuration steps were done properly. Read GRUB's manual on Using GRUB via a serial line and the serial command for detailed explanation of the available options. GRUB_SERIAL_COMMAND="serial -unit=0 -speed=115200" For COM1 ( /dev/ttyS0) with baud rate of 115200 bit/s: Next add the GRUB_SERIAL_COMMAND variable and set the options for the serial connection. When using GRUB with a generated grub.cfg, edit /etc/default/grub and enable serial input and output support: The configuration instructions below will enable boot loader menu selection, boot messages, and terminal forwarding to the serial console.Ĭonfigure console access on the target machine Boot loader GRUB The administering machine can be any Unix/Linux or Windows machine with a terminal emulator program (PuTTY or Minicom, for example). Installation of Arch Linux is possible via the serial console as well.Ī basic environment for this scenario is two machines connected using a serial cable (9-pin connector cable). An Arch Linux machine can be configured for connections via the serial console port, which enables administration of a machine even if it has no keyboard, mouse, monitor, or network attached to it.
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