William Manley 720e2ec9bc Add support for devicetree files alongside the kernel and initramfs ... Much like the (optional) initramfs at `/usr/lib/ostree-boot/initramfs-<SHA256>` or `/usr/lib/modules/$kver/initramfs` you can now optionally include a flattened devicetree (.dtb) file alongside the kernel at `/usr/lib/ostree-boot/devicetree-<SHA256>` or `/usr/lib/modules/$kver/devicetree`. This is useful for embedded ARM systems which need the devicetree file loaded by the bootloader for the kernel to discover and initialise hardware. See https://en.wikipedia.org/wiki/Device_tree for more information. This patch was mostly produced by copy-pasting code for initramfs handling and renaming `s/initramfs/devicetree/g`. It's not beautiful, but it is fairly straightforward. It may be useful to extend device-tree support in a number ways in the future. Device trees dependant on many details of the hardware they support. This makes them unlike kernels, which may support many different hardware variants as long as the instruction-set matches. This means that a ostree tree created with a device-tree in this manner will only boot on a single model of hardware. This is sufficient for my purposes, but may not be for others'. I've tested this on my NVidia Tegra TK1 device which has u-boot running in syslinux-compatible mode. Closes: #1411 Approved by: cgwalters		2018-01-16 22:54:53 +00:00
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manual	Add support for devicetree files alongside the kernel and initramfs	2018-01-16 22:54:53 +00:00
CONTRIBUTING.md	doc: fix typo in CONTRIBUTING	2017-02-03 19:05:40 +00:00
index.md	Rewrite manual in mkdocs	2016-01-28 09:31:37 -05:00