rpi_info.md

raspberry pi

• binary blobs

  • fixup.dat, start.elf: the most common use one

  • fixup_cd.dat, start_cd.elf: used when GPU memory is set to 16 MB

  • fixup_x.dat, start_x.elf: with experimental support for more free codecs

  • start_db.elf, fixup_db.dat: debug use

arm board dosen't came with BIOS, instead they have blobs from vendor

and which is closed source

for raspberry pi that is:

bootcode.bin

fixup.dat

start.elf

we can get it from this repos: https://github.com/raspberrypi/firmware/tree/master/boot

they usually put in /boot directory

• bootloader

usually we don't need bootloader for rpi, but if we want we can install das u-boot and grub2

here is a repos from opensuse member: https://github.com/agraf/rpi-instsd

he chainload the grub2 with u-boot

• kernel

  • upstream

    • rpi zero, zero w, A+, B+: bcm2835_defconfig

    • 2B+, 3B 32bit, 3B+ 32bit: multi_v7_defconfig

    • 3B 64bit, 3B+ 64bit: defconfig(?)

  upstream is from Linux upstream

  • downstream

    • rpi zero, zero w, A+, B+: bcmrpi_defconfig

    • 2B+, 3B 32bit, 3B+ 32bit: bcm2709_defconfig

    • 3B 64bit, 3B+ 64bit: bcmrpi3_defconfig

  downstream is from Raspberry Pi Foundation, have better support for raspberry pi board, we usually use this

• drivers

  • LAN

    • 2B+/3B: CONFIG_USB_NET_SMSC95XX

    • 3B+: CONFIG_USB_LAN78XX

  • Wi-Fi

    • 3B, zero w: brcmfmac43430-sdio.bin, brcmfmac43430-sdio.txt

    • 3B+: brcmfmac43455-sdio.bin, brcmfmac43455-sdio.clm_blob, brcmfmac43455-sdio.txt

  also need (CONFIG_MMC_BCM2835_MMC&&CONFIG_BRCMFMAC_USB)

  get them from here: https://github.com/RPi-Distro/firmware-nonfree/tree/master/brcm

  • Bluetooth

    • 3B, zero w: BCM43430A1.hcd

    • 3B+: BCM4345C0.hcd

  get them from here: https://github.com/RPi-Distro/bluez-firmware/tree/master/broadcom

  usually those broadcom firmware should locate in /lib/firmware/brcm

• rootfs