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docs: drop "Device tree support" section
We no longer provide any Linux kernel which do not have device-tree support and all machines setup KERNEL_DEVICETREE correctly. Signed-off-by: Mirza Krak <mirza.krak@endian.se>
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@ -120,19 +120,6 @@ To build an initramfs image:
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* Set the meta-rasberrypi variable (in raspberrypi.conf for example)
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* Set the meta-rasberrypi variable (in raspberrypi.conf for example)
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- `KERNEL_INITRAMFS = "-initramfs"`
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- `KERNEL_INITRAMFS = "-initramfs"`
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## Device tree support
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Device tree for RPi is only supported when using linux-raspberrypi 3.18+
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kernels.
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* Set `KERNEL_DEVICETREE` (in conf/machine/raspberrypi.conf)
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- the trailer is added to the kernel image before kernel install task. While
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creating the SDCard image, this modified kernel is put on boot partition (as
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kernel.img) as well as DeviceTree blobs (.dtb files).
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NOTE: `KERNEL_DEVICETREE` is default enabled for kernel >= 3.18 and always
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disabled for older kernel versions.
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## Enable SPI bus
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## Enable SPI bus
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When using device tree kernels, set this variable to enable the SPI bus:
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When using device tree kernels, set this variable to enable the SPI bus:
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