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Can't get grub2 boot menu via COM2 port

Can't get grub2 boot menu via COM2 port

mrco asked: I want to connect my “CentOS Linux release 7.6.1810 (Core)” device via COM2 port,then I modify ‘/etc/default/grub’: GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR=”$(sed ‘s, release .*$,,g’ /etc/system-release)” GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT=”serial” GRUB_CMDLINE_LINUX=”console=tty0 console=ttyS1,115200n8″ …

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