boards/raspberrypi: update readme with Device Tree instructions
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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@ -23,6 +23,10 @@ work on this defconfig:
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$ make raspberrypi_defconfig
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Alternatively, if you want to test support for the Device Tree:
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$ make raspberrypi_dt_defconfig
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If you want to use a persistent rootfs, skip to "Build the rootfs", below.
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For a volatile rootfs, you have to slightly adjust the configuration:
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@ -51,16 +55,22 @@ Result of the build
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After building, you should obtain this tree:
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output/images/
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+-- rootfs.tar
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+-- rpi-firmware
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+-- rootfs.tar [0]
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+-- rpi-firmware/
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| +-- bcm2708-rpi-b.dtb [1]
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| +-- bcm2708-rpi-b-plus.dtb [1]
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| +-- bootcode.bin
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| +-- config.txt
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| +-- fixup.dat
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| `-- start.elf
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`-- zImage
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Note for Volatile: rootfs.tar will only be there if you kept
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"tar the root filesystem" option selected in "Filesystem images".
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[0] Note for Volatile: rootfs.tar will only be there if you kept
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"tar the root filesystem" option selected in "Filesystem images".
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[1] The DTBs (Device Tree Blobs) will only be present if you setup
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Buildroot to install the DTBs from the rpi-firmware package, and
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will only be used if your kernel has support for the Device Tree.
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Prepare you SDCard
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==================
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@ -89,17 +99,30 @@ Install the binaries to the SDCard
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At the root of the boot partition, the RaspberryPi must find the following
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files:
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* bcm2708-rpi-b.dtb [2]
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* bcm2708-rpi-b-plus.dtb [2]
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* bootcode.bin
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* config.txt
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* fixup.dat
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* start.elf
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* zImage
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[2] Only needed if your kernel has support for the Device Tree.
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For example:
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$ cp output/images/rpi-firmware/* /mnt/mountpointboot
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If your kernel does *not* have support for the Device Tree, then install
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it with:
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$ cp output/images/zImage /mnt/mountpointboot
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If your kernel *does* have support for the Device Tree, then install it
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with:
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$ ./output/host/usr/bin/mkknlimg output/images/zImage /mnt/mountpointboot/zImage
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Note: The kernel image file name is defined in config.txt like this:
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kernel=zImage
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