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haiku/docs/develop/kernel/ports/arm/rpi2.md
Augustin Cavalier e81a954787 docs/develop: Mass directory restructure. 
Now vaguely follows the tree structure of "src", with the exception of
directories that described subsystems spanning more than one "kit" or
"server" (e.g. "media", "midi", "bluetooth") -- these have been left as their
own top-level directory within docs/develop.
2018-01-10 16:12:14 -05:00

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Raspberry Pi 2

Hardware Information

  • ARMv7 Architecture
  • Broadcom BCM2836 (SoC)
    • Includes Quad ARM1176JZF-S CPU @ 900 MHz
    • Includes VideoCore IV GPU
  • SD Card Storage
  • 1 GB RAM
  • 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
  • bcm2836-rpi-2-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=rpi2
  • 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} bcm2836-rpi-2-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