3 Commits

Author	SHA1	Message	Date
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
William Manley	3318db548e	Tests: test-no-initramfs: Test both legacy and new kernel locations ... Closes: #1401 Approved by: cgwalters	2018-01-10 13:52:58 +00:00
Gatis Paeglis	4233b1db19	Support for booting without initramfs ... Previously when initramfs-* was not found in a deployment's boot directory, it was assumed that rootfs is prepared for ostree booting by a kernel patch. With this patch, the behaviour changes to be - if initramfs-* is not found, assume that system is using a static ostree-prepare-root as init process. Booting without initramfs is a common use case on embedded systems. This approach is also more convenient, than having to patch the kernel. Closes: #1401 Approved by: cgwalters	2018-01-10 13:52:58 +00:00