128 lines
3.0 KiB
Plaintext
128 lines
3.0 KiB
Plaintext
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RaspberryPi
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Intro
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=====
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To be able to use your RaspberryPi board with the images generated by
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Buildroot, you have a prior choice to make, will you use:
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- Volatile rootfs in RAM (The rootfs is an initramfs) or
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- Persistent rootfs on the SDCard
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Also, a good source of information is http://elinux.org/R-Pi_Hub
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Volatile rootfs
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===============
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How to build it
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---------------
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You need to use the rpi_defconfig, to do so:
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* make rpi_defconfig
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Then, you need to select the kind of images you want:
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* make menuconfig
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* Select "Filesystem images"
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* Select "initial RAM filesystem linked into linux kernel"
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What is generated
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-----------------
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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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| +-- bootcode.bin
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| +-- config.txt
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| +-- fixup_cd.dat
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| +-- fixup.dat
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| +-- start_cd.elf
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| `-- start.elf
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`-- zImage
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Note : rootfs.tar will only be there if you kept "tar the root filesystem"
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option selected in "Filesystem images".
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Where should the binaries be copied on the SDCard
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-------------------------------------------------
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Your SDCard must have its first partition using fat32 and marked bootable.
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At the root of the partition, the RaspberryPi must find the following files:
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* bootcode.bin
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* config.txt
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* fixup_cd.dat
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* fixup.dat
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* start_cd.elf
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* start.elf
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* zImage
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So you should copy the entire content of output/images/rpi-firmware along with
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zImage.
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Note: You can create any number of partitions you desire, the only requirement
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is that the first partition must be using fat32 and bootable.
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Persistent rootfs
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=================
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How to build it
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---------------
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You only need to use the rpi_defconfig, to do so:
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* make rpi_defconfig
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What is generated
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-----------------
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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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| +-- bootcode.bin
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| +-- config.txt
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| +-- fixup_cd.dat
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| +-- fixup.dat
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| +-- start_cd.elf
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| `-- start.elf
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`-- zImage
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Where should the binaries be copied on the SDCard
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-------------------------------------------------
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Your SDCard must have its first partition using fat32 and marked bootable.
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It should also have another partition which will contain your rootfs, it should
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be partitioned as ext4.
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Boot partition
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~~~~~~~~~~~~~~
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The first partition will contain everything used to boot the RaspberryPi.
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You must copy theses files at the root of partition:
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* bootcode.bin
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* config.txt
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* fixup_cd.dat
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* fixup.dat
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* start_cd.elf
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* start.elf
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* zImage
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So you should copy the entire content of output/images/rpi-firmware along with
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zImage.
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Rootfs partition
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~~~~~~~~~~~~~~~~
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The second partition will contain your rootfs.
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Simply extract (as root!) the contents of the rootfs.tar archive
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into this partition.
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For example: (Assuming mountpoint is a directory and exist)
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$ sudo mount /dev/sdXY /mnt/mountpoint
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$ sudo tar xf rootfs.tar -C /mnt/mountpoint
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