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| Line 493: |
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| Otherwise, in SBC-class hardware, it is common that boards are generally expected to use U-Boot as the platform firmware and bootloader. See the section about [[U-Boot#Using NixOS with U-Boot|using NixOS with U-Boot]]. | | Otherwise, in SBC-class hardware, it is common that boards are generally expected to use U-Boot as the platform firmware and bootloader. See the section about [[U-Boot#Using NixOS with U-Boot|using NixOS with U-Boot]]. |
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| == Porting NixOS to new boards ==
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|
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| === The easiest way ===
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|
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| Assuming upstream U-Boot supports the board through a defconfig, it is possible possible to build U-Boot using the cross-compiling architecture from an x86_64 host. Here's a sample use.
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|
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| <syntaxhighlight lang="shell-session">
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| # Assuming you're in a recent nixpkgs checkout
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| $ nix-shell \
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| -I "nixpkgs=$PWD" \
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| -p 'let plat = pkgsCross.aarch64-multiplatform; in plat.buildUBoot{defconfig = "orangepi_zero_plus2_defconfig"; extraMeta.platforms = ["aarch64-linux"]; BL31 = "${plat.armTrustedFirmwareAllwinner}/bl31.bin"; filesToInstall = ["u-boot-sunxi-with-spl.bin"];}'
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| </syntaxhighlight>
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|
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| For armv7 and armv6 <code>pkgsCross.arm-embedded</code> should work, this is available in the unstable channel (19.03 and following) by setting <code>-I "nixpkgs=/path/to/new-nixpkgs-checkout</code>.
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|
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| This should build whatever is needed for, and then build U-Boot for the desired defconfig, then open a shell with the build in <code>$buildInputs</code>. Do note that this particular invocation may need more changes than only the defconfig if built for other than allwinner boards.
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|
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| Here's an example command, for allwinner boards, on how to write to an SD card.
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|
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| <syntaxhighlight lang="shell-session">
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| $ sudo dd if=$buildInputs/u-boot-sunxi-with-spl.bin of=/dev/sdX bs=1024 seek=8
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| </syntaxhighlight>
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|
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| === The easy way ===
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|
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| ''(if you're lucky)''
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|
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| If your board is an ARMv7 board supported by multi_v7_defconfig and you have access to U-Boot on the board, getting <code>sd-image-armv7l-linux.img</code> to boot is the easiest option:
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|
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| * If you're lucky and your U-Boot build comes with the extlinux.conf support built in, the image boots out-of-the-box. This is the case for all (upstream) Allwinner and Tegra U-Boots, for instance.
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| * Otherwise, you can get the boot information (path to kernel zImage, initrd, DTB, command line arguments) by extracting <code>extlinux.conf</code> from the boot partition of the image, and then attempt to boot it via the U-Boot shell, or some other mechanism that your board's distro uses (e.g. <code>uEnv.txt</code>).
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|
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| ==== Building U-Boot from your NixOS PC ====
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|
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| Assuming
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|
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| * Your board is supported upstream by U-Boot or there is a recent enough fork with <code>extlinux.conf</code> support.
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| * You do not have nix setup on an ARM device
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| * Your nix isn't setup for cross-compilation
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|
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| It is still possible to build U-Boot using tools provided by NixOS.
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|
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| In the following terminal session, replace <code>orangepi_pc_defconfig</code> with the appropriate board [http://git.denx.de/?p=u-boot.git;a=tree;f=configs;hb=HEAD from the configs folder] of U-Boot.
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|
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| {{Commands|<nowiki>
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| $ nix-shell -E 'with import <nixpkgs> {}; stdenv.mkDerivation { name = "arm-shell"; buildInputs = [git gnumake gcc gcc-arm-embedded dtc]; }'
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| $ git clone git://git.denx.de/u-boot.git
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| $ cd u-boot
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| # We're checking out a version from before the use of `binman`.
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| # The dtc package is 1.4.2, which does not include `pylibftd`.
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| # Furthermore, I do not know how to package the library so it would be
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| # available in the python interpreter, making binman happy.
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| $ git checkout v2017.03
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| $ make -j4 CROSS_COMPILE=arm-none-eabi- orangepi_pc_defconfig
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| $ make -j4 CROSS_COMPILE=arm-none-eabi-
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| </nowiki>}}
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|
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| The name of the final file will change depending on the board. For this specific build, and most Allwinner builds, the file will be named <code>u-boot-sunxi-with-spl.bin</code>.
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|
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| You can flash this file to boot device with
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|
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| {{Commands|<nowiki>
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| dd if=u-boot-sunxi-with-spl.bin of=/dev/sdX bs=1024 seek=8
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| </nowiki>}}
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|
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| Note: This mailing list contains a patch which may help some builds: https://lists.denx.de/pipermail/u-boot/2016-December/275664.html
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|
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| === The hard way ===
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|
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| Alternatively/if all else fails, you can do it the hard way and bootstrap NixOS from an existing ARM Linux installation.
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|
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| === Contributing new boards to nixpkgs ===
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|
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| * Add a new derivation for your board's U-Boot configuration, see for example ubootPine64LTS in {{Nixpkgs Link|short=all-packages.nix|pkgs/top-level/all-packages.nix}}.
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| * If your board's U-Boot configuration doesn't use the <code>extlinux.conf</code> format by default, create a patch to enable it. Some C hacking skills & U-Boot knowledge might be required. For some pointers, see this patch to enable it on the Versatile Express.
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| * Make a pull request, also containing the board-specific instructions.
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|
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|
| == Getting Support == | | == Getting Support == |
