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@@ -22,17 +22,14 @@ How to build it
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Configure Buildroot
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-------------------
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-The raspberrypi_defconfig configuration is a minimal configuration with
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-all that is required to bring the Raspberry Pi up. You should base your
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-work on this defconfig:
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+There are two RaspberryPi defconfig files in Buildroot, one for each
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+major variant, which you should base your work on:
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- $ make raspberrypi_defconfig
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-
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-Alternatively, if you want to test support for the Device Tree:
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+For models A, B, A+ or B+:
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- $ make raspberrypi_dt_defconfig
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+ $ make raspberrypi_defconfig
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-For Raspberry Pi 2 use a different defconfig:
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+And for model 2 B:
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$ make raspberrypi2_defconfig
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@@ -64,20 +61,23 @@ 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 [0]
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+ +-- rootfs.tar [0]
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+-- rpi-firmware/
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- | +-- bcm2708-rpi-b.dtb
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- | +-- bcm2708-rpi-b-plus.dtb
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- | +-- bcm2709-rpi-2-b.dtb
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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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+ +-- bcm2708-rpi-b.dtb [1]
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+ +-- bcm2708-rpi-b-plus.dtb [1]
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+ +-- bcm2709-rpi-2-b.dtb [1]
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`-- zImage
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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] Not all of them will be present, depending on the RaspberryPi
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+ model you are using.
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+
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Prepare you SDCard
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==================
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@@ -105,30 +105,26 @@ Install the binaries to the SDCard
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At the root of the boot partition, the Raspberry Pi must find the following
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files:
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- * bcm2708-rpi-b.dtb [1]
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- * bcm2708-rpi-b-plus.dtb [2]
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- * bcm2709-rpi-2-b.dtb [3]
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+ * bcm2708-rpi-b.dtb [2]
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+ * bcm2708-rpi-b-plus.dtb [3]
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+ * bcm2709-rpi-2-b.dtb [4]
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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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-[1] For models A and B
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-[2] For models A+ and B+
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-[3] For model 2
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+[2] For models A and B
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+[3] For models A+ and B+
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+[4] For model 2
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For example:
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- $ cp output/images/rpi-firmware/* /mnt/mountpointboot
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-
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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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-
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- $ cp output/images/zImage /mnt/mountpointboot
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+ $ cp output/images/rpi-firmware/* /mnt/mountpointboot
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+ $ cp output/images/*.dtb /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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+The kernel image must be marked with a special header so that the
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+bootloader of the RaspberryPi knows it supports Device Tree:
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$ ./output/host/usr/bin/mkknlimg output/images/zImage /mnt/mountpointboot/zImage
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