Raspberry Pi

Hardware Information

  • ARMv6 Architecture

  • Broadcom BCM2835 (SoC)

    • Includes ARM1176JZF-S CPU @ 700 MHz

    • Includes VideoCore IV GPU

  • SD Card Storage

  • 256 or 512 MB RAM (depending on revision)

  • Video Outputs

    • HDMI Video Output

    • Composite Video Output

  • Ethernet

Setting up the Haiku SD card

The Raspberry Pi SD card generally uses the MBR file system layout below. Partition 1 is all that is required to boot an OS.

  • partition 1 – FAT32, bootable flag, type ‘c’

  • partition 2 – BeFS, Haiku filesystem, type ‘eb’

Boot Partition

Required Files

  • bootcode.bin : 2nd stage bootloader

  • start.elf: The GPU binary firmware image

  • config.txt: A configuration file read by the Pi to start u-boot.bin

  • u-boot.bin: u-boot loader for the Pi 2

  • bcm2835-rpi-b.dtb: FDT binary for the Raspberry Pi 2

  • haiku_loader_linux.ub: Haiku Loader

  • haiku-floppyboot.tgz.ub: Compressed initial ram image with Haiku kernel

Optional Files

  • vlls directory: Additional GPU code, e.g. extra codecs.

  • uEnv.txt: u-boot configuration script to automate boot.

Compiling

  • Create your ARM work directory mkdir generated.arm; cd generated.arm

  • Build an ARM toolchain using ../configure --build-cross-tools arm ../../buildtools --target-board=rpi1

  • Build our loader using jam -q haiku_loader_linux.ub

  • Build our initial ram disk using jam -q haiku-floppyboot.tgz.ub

Booting

  1. SOC finds bootcode.bin

  2. bootcode.bin runs start.elf

  3. start.elf reads config.txt and start u-boot

  4. u-boot.bin starts the Haiku loader

  5. Haiku loader boots Haiku kernel

config.txt Options

kernel=u-boot.bin

u-boot startup

These will be condensed and automated long-term via uEnv.txt :-)

  • fatload mmc 0 ${fdt_addr_r} bcm2835-rpi-b.dtb

  • fdt addr ${fdt_addr_r}

  • fatload mmc 0 ${ramdisk_addr_r} haiku-floppyboot.tgz.ub

  • fatload mmc 0 ${kernel_addr_r} haiku_loader_linux.ub

  • bootm ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}

Additional Information