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| -rw-r--r-- | board/raspberrypi/readme.txt | 167 |
1 files changed, 84 insertions, 83 deletions
diff --git a/board/raspberrypi/readme.txt b/board/raspberrypi/readme.txt index 32877951d..47b48186d 100644 --- a/board/raspberrypi/readme.txt +++ b/board/raspberrypi/readme.txt @@ -4,124 +4,125 @@ Intro ===== To be able to use your RaspberryPi board with the images generated by -Buildroot, you have a prior choice to make, will you use: - - Volatile rootfs in RAM (The rootfs is an initramfs) or - - Persistent rootfs on the SDCard +Buildroot, you have to choose whether you will use: + + * Volatile rootfs in RAM (the rootfs is an initramfs) or + * Persistent rootfs on the SDCard Also, a good source of information is http://elinux.org/R-Pi_Hub -Volatile rootfs +How to build it =============== -How to build it ---------------- +Configure Buildroot +------------------- + +The rpi_defconfig configuration is a minimal configuration with all that +is required to bring the Raspberry Pi. You should base your work on this +defconfig: + + $ make rpi_defconfig + +If you want to use a persistent rootfs, skip to "Build the rootfs", below. + +For a volatile rootfs, you have to slightly adjust the configuration: + + $ make menuconfig + * Select "Filesystem images" + * Select "initial RAM filesystem linked into linux kernel" + +You may also deselect "tar the root filesystem". + +Build the rootfs +---------------- -You need to use the rpi_defconfig, to do so: - * make rpi_defconfig +Note: you will need to have access to the network, since Buildroot will +download the packages' sources. -Then, you need to select the kind of images you want: - * make menuconfig - * Select "Filesystem images" - * Select "initial RAM filesystem linked into linux kernel" +You may now build your rootfs with: -What is generated ------------------ + $ make + +(This may take a while; consider getting yourself a coffee ;-) ) + +Result of the build +------------------- After building, you should obtain this tree: output/images/ +-- rootfs.tar +-- rpi-firmware - | +-- bootcode.bin - | +-- config.txt - | +-- fixup_cd.dat - | +-- fixup.dat - | +-- start_cd.elf - | `-- start.elf + | +-- bootcode.bin + | +-- config.txt + | +-- fixup_cd.dat + | +-- fixup.dat + | +-- start_cd.elf + | `-- start.elf `-- zImage -Note : rootfs.tar will only be there if you kept "tar the root filesystem" -option selected in "Filesystem images". - -Where should the binaries be copied on the SDCard -------------------------------------------------- +Note for Volatile: rootfs.tar will only be there if you kept +"tar the root filesystem" option selected in "Filesystem images". -Your SDCard must have its first partition using fat32 and marked bootable. +Prepare you SDCard +================== -At the root of the partition, the RaspberryPi must find the following files: +For more information, visit +http://elinux.org/RPi_Advanced_Setup#Advanced_SD_card_setup - * bootcode.bin - * config.txt - * fixup_cd.dat - * fixup.dat - * start_cd.elf - * start.elf - * zImage +In summary, your SDCard must have first partition in fat32 and marked bootable. -So you should copy the entire content of output/images/rpi-firmware along with -zImage. +Create the required partitions: + - for a persistent rootfs, 10MiB is enough memory for the boot fat32 + partition, and a second partition is required for the root filesystem + - for a volatile rootfs, 50MiB is required for the boot fat32 partition Note: You can create any number of partitions you desire, the only requirement -is that the first partition must be using fat32 and bootable. +is that the first partition must be using fat32 and be bootable. -Persistent rootfs -================= - -How to build it ---------------- +Mount the partitions (adjust 'sdX' to match your SDcard device): -You only need to use the rpi_defconfig, to do so: - * make rpi_defconfig + $ sudo mount /dev/sdX1 /mnt/mountpointboot + $ sudo mount /dev/sdX2 /mnt/mountpointroot (only for persistent rootfs) -What is generated ------------------ +Install the binaries to the SDCard +---------------------------------- -After building, you should obtain this tree: +At the root of the boot partition, the RaspberryPi must find the following +files: - output/images/ - +-- rootfs.tar - +-- rpi-firmware - | +-- bootcode.bin - | +-- config.txt - | +-- fixup_cd.dat - | +-- fixup.dat - | +-- start_cd.elf - | `-- start.elf - `-- zImage + * bootcode.bin + * config.txt + * fixup.dat + * start.elf + * zImage -Where should the binaries be copied on the SDCard -------------------------------------------------- +For example: -Your SDCard must have its first partition using fat32 and marked bootable. -It should also have another partition which will contain your rootfs, it should -be partitioned as ext4. + $ cp output/images/rpi-firmware/* /mnt/mountpointboot + $ cp output/images/zImage /mnt/mountpointboot/zImage.img -Boot partition -~~~~~~~~~~~~~~ +Note: The default name is kernel.img. +Actually, the name is zImage and it's define in the file config.txt like: +kernel=zImage -The first partition will contain everything used to boot the RaspberryPi. -You must copy theses files at the root of partition: +If you use a volatile rootfs, Skip to "Finish", below. For a persistent +rootfs, there are further steps to do. - * bootcode.bin - * config.txt - * fixup_cd.dat - * fixup.dat - * start_cd.elf - * start.elf - * zImage +Extract (as root!) the contents of the rootfs.tar archive into the second +partition you created above: -So you should copy the entire content of output/images/rpi-firmware along with -zImage. + $ sudo tar xf rootfs.tar -C /mnt/mountpointroot -Rootfs partition -~~~~~~~~~~~~~~~~ +Finish +====== -The second partition will contain your rootfs. -Simply extract (as root!) the contents of the rootfs.tar archive -into this partition. +Unmount all the partitions: -For example: (Assuming mountpoint is a directory and exist) + $ sudo umount /mnt/mountpointboot + $ sudo umount /mnt/mountpointroot (only for persistent rootfs) - $ sudo mount /dev/sdXY /mnt/mountpoint - $ sudo tar xf rootfs.tar -C /mnt/mountpoint +And eject your SDcard from your computer SDcard reader. +Insert the SDcard into your Raspberry Pi, and power it up. Your new system +should come up, now. |