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This .zip file contains the RISC OS 5.24 ROM for the Raspberry Pi, along with three Pi firmware files (bootloader.bin, start.elf, fixup.dat).
It is intended to be used by people who wish to “roll their own” Raspberry Pi boot SD cards.
If you are new to RISC OS you may prefer to download the RISC OS Pi SD image, which contains all the necessary elements ready to be copied to a blank SD card.
Unpack this archive and place all the files in the DOS partition of the SD card.
In addition to the files in this archive, you will also need a config.txt file in the DOS partition. At a minimum, this file should contain:
fake_vsync_isr=1
framebuffer_swap=0
ramfsfile=CMOS
ramfsaddr=0x508000
kernel=RISCOS.IMG
You will also need the RISC OS 5.24 HardDisc4 image from Miscellaneous downloads which you should install in the Filecore partition of the SD card. This needs to be done under RISC OS, which is why this process is less suitable for a first-time user.
For more on bootloader files (including config.txt and cmdline.txt) see Software information: Raspberry Pi: Firmware.
You may also want to read Welcome to RISC OS Pi.
An explanation of how the Raspberry Pi port works is also available.