75 lines
2.1 KiB
Markdown
75 lines
2.1 KiB
Markdown
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# Raspberry Pi 2
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* http://raspberrypi.org
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# Hardware Information
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* ARMv7 Architecture
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* Broadcom BCM2836 (SoC)
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* Includes Quad ARM1176JZF-S CPU @ 900 MHz
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* Includes VideoCore IV GPU
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* SD Card Storage
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* 1 GB RAM
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* Video Outputs
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* HDMI Video Output
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* Composite Video Output
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* Ethernet
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# Setting up the Haiku SD card
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The Raspberry Pi SD card generally uses the MBR file system layout below. Partition 1 is all that is required to boot an OS.
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* partition 1 -- FAT32, bootable flag, type 'c'
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* partition 2 -- BeFS, Haiku filesystem, type 'eb'
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## Boot Partition
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### Required Files
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* bootcode.bin : 2nd stage bootloader
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* start.elf: The GPU binary firmware image
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* config.txt: A configuration file read by the Pi to start u-boot.bin
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* u-boot.bin: u-boot loader for the Pi 2
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* bcm2836-rpi-2-b.dtb: FDT binary for the Raspberry Pi 2
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* haiku_loader_linux.ub: Haiku Loader
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* haiku-floppyboot.tgz.ub: Compressed initial ram image with Haiku kernel
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### Optional Files
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* vlls directory: Additional GPU code, e.g. extra codecs.
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* uEnv.txt: u-boot configuration script to automate boot.
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# Compiling
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* Create your ARM work directory `mkdir generated.arm; cd generated.arm`
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* Build an ARM toolchain using `../configure --build-cross-tools arm ../../buildtools --target-board=rpi2`
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* Build our loader using `jam -q haiku_loader_linux.ub`
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* Build our initial ram disk using `jam -q haiku-floppyboot.tgz.ub`
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# Booting
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1. SOC finds bootcode.bin
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2. bootcode.bin runs start.elf
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3. start.elf reads config.txt and start u-boot
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4. u-boot.bin starts the Haiku loader
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5. Haiku loader boots Haiku kernel
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## config.txt Options
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kernel=u-boot.bin
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## u-boot startup
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These will be condensed and automated long-term via uEnv.txt :-)
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* `fatload mmc 0 ${fdt_addr_r} bcm2836-rpi-2-b.dtb`
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* `fdt addr ${fdt_addr_r}`
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* `fatload mmc 0 ${ramdisk_addr_r} haiku-floppyboot.tgz.ub`
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* `fatload mmc 0 ${kernel_addr_r} haiku_loader_linux.ub`
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* `bootm ${kernel_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}`
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# Additional Information
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* [Latest Raspberry Pi firmware](http://github.com/raspberrypi/firmware/tree/master/boot)
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* [config.txt options](http://www.elinux.org/RPiconfig)
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