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Tom Fitzhenry 9d92c9d0a7 iso-image: add 'serial console' boot entry
Prior to this commit, installation over serial console would requiring
manually having to modify the kernel modeline, as described in
https://github.com/NixOS/nixpkgs/issues/58198 .

This is unnecessarily fiddly, so this commit adds a syslinux boot
entry that has serial enabled.

GRUB already has a serial console entry:
2c07a0800a/nixos/modules/installer/cd-dvd/iso-image.nix (L311-L317)

Why 115200 bps? This is already used in other places, e.g. https://github.com/NixOS/nixpkgs/pull/58196

I tested this change by building the image, booting the image, and
observing the boot process over serial:

    $ cd nixos/
    $ nix-build -A config.system.build.isoImage -I nixos-config=modules/installer/cd-dvd/installation-cd-minimal.nix default.nix
    $ sudo cp /nix/store/arcl702c3z8xlndlvnfplq9yhixjvs9k-nixos-20.09pre-git-x86_64-linux.iso/iso/nixos-20.09pre-git-x86_64-linux.iso /dev/sdb

    $ picocom -b 115200 /dev/ttyUSB0
2020-12-22 16:16:15 +08:00
..
cd-dvd iso-image: add 'serial console' boot entry 2020-12-22 16:16:15 +08:00
netboot Revert "Revert "Merge master into staging-next"" 2020-02-05 19:41:25 +01:00
scan
tools nix: 2.3.9 -> 2.3.10 2020-12-18 12:33:49 +01:00
virtualbox-demo.nix ova: remove stateVersion 2019-03-09 14:25:05 -05:00