boards/raspberrypi: update instructions
Now that we have a sanitised set of defconfig files, and we no longer support non-DT setups, update and simplify the board readme file. Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Floris Bos <bos@je-eigen-domein.nl> Cc: Pascal de Bruijn <pmjdebruijn@pcode.nl> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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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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For models A, B, A+ or B+:
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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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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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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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$ 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 *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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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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