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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
..
doc nixos/doc: add note about codimd -> hedgedoc to release notes 2020-12-22 01:39:03 +01:00
lib Merge pull request #104292 from fgaz/image-contents 2020-12-21 19:58:49 +01:00
maintainers Merge pull request #102174 from grahamc/ami-root-use-gpt 2020-10-30 16:14:37 -04:00
modules iso-image: add 'serial console' boot entry 2020-12-22 16:16:15 +08:00
tests nixos/codimd: rename to hedgedoc 2020-12-22 01:39:03 +01:00
COPYING
default.nix
README
release-combined.nix nixos: release-combined: only build the amazon image for x86_64,aarch64-linux -- exclude i686 2020-11-19 19:34:23 -05:00
release-small.nix Merge pull request #104322 from grahamc/amazon-image 2020-11-19 18:45:07 -05:00
release.nix

README 

*** NixOS ***

NixOS is a Linux distribution based on the purely functional package
management system Nix.  More information can be found at
https://nixos.org/nixos and in the manual in doc/manual.