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bcm27xx: add support for Raspberry Pi Zero 2

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Due to licensing uncertainty, we do not include the firmwares for the
wireless chips used in the Raspberry Pi Zero 2 W. To have working
wireless, follow the instructions below.

For people building their own images:

  mkdir -p files/lib/firmware/brcm
  wget -P files/lib/firmware/brcm/ https://github.com/RPi-Distro/firmware-nonfree/raw/bullseye/debian/config/brcm80211/brcm/brcmfmac43436-sdio.bin
  wget -P files/lib/firmware/brcm/ https://github.com/RPi-Distro/firmware-nonfree/raw/bullseye/debian/config/brcm80211/brcm/brcmfmac43436-sdio.txt
  wget -P files/lib/firmware/brcm/ https://github.com/RPi-Distro/firmware-nonfree/raw/bullseye/debian/config/brcm80211/brcm/brcmfmac43436s-sdio.bin
  wget -P files/lib/firmware/brcm/ https://github.com/RPi-Distro/firmware-nonfree/raw/bullseye/debian/config/brcm80211/brcm/brcmfmac43436s-sdio.txt

Now build the OpenWrt image as usual, and it will include the firmware
files in the correct location.

For people using ext4 images:

Write the ext4 image to the sdcard, then mount the 2nd partition and put
the firmware files from the links above in /lib/firmware/brcm relative
from the mount point where the partition is mounted.

For people using squashfs images:

Write the squashfs image to the sdcard, place it in the Raspberry Pi
Zero 2 W, boot it and wait for the overlay filesystem to be created.
Find the offset of the overlay filesystem in sysfs:

  # cat /sys/devices/virtual/block/loop0/loop/offset
  25755648

Shut down the device, unplug the power and move the SD card to a Linux
computer. Mount the 2nd partition of the sdcard as a loop device with
the offset found earlier.

  sudo mount /dev/sdh2 -o loop,offset=25755648 /mnt/temp

Put the firmware files from the links above in /upper/lib/firmware/brcm
relative to the mount point where the loop device is mounted.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Tested-by: Peter van Dijk <peter@7bits.nl>
This commit is contained in:
Stijn Tintel 2021-11-01 23:39:48 +02:00
parent a5526efde0
commit e9f9cd14cc
3 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
target/linux/bcm27xx/base-files/etc/board.d/02_network
View File

@ -23,6 +23,7 @@ raspberrypi,model-b-rev2)
ucidef_set_interface_lan "eth0"
;;
raspberrypi,model-zero-2 |\
raspberrypi,model-zero-w)
ucidef_set_interface_lan "wlan0"
;;

1
target/linux/bcm27xx/base-files/etc/diag.sh
View File

@ -20,6 +20,7 @@ set_state() {
raspberrypi,3-compute-module |\
raspberrypi,model-b |\
raspberrypi,model-zero |\
raspberrypi,model-zero-2 |\
raspberrypi,model-zero-w)
status_led="led0"
;;

16
target/linux/bcm27xx/image/Makefile
View File

@ -96,13 +96,15 @@ define Device/rpi-2
bcm2709-rpi-2-b bcm2710-rpi-2-b \
bcm2710-rpi-3-b bcm2710-rpi-3-b-plus \
bcm2711-rpi-4-b bcm2711-rpi-400 \
bcm2710-rpi-cm3 bcm2711-rpi-cm4
bcm2710-rpi-cm3 bcm2711-rpi-cm4 \
bcm2710-rpi-zero-2
SUPPORTED_DEVICES := \
rpi-2-b rpi-3-b rpi-3-b-plus rpi-cm \
rpi-2-b rpi-3-b rpi-3-b-plus rpi-cm rpi-zero-2 \
raspberrypi,2-model-b raspberrypi,2-model-b-rev2 \
raspberrypi,3-model-b raspberrypi,3-model-b-plus \
raspberrypi,3-compute-module raspberrypi,compute-module-3 \
raspberrypi,400 raspberrypi,4-compute-module raspberrypi,4-model-b
raspberrypi,400 raspberrypi,4-compute-module raspberrypi,4-model-b \
raspberrypi,model-zero-2
DEVICE_PACKAGES := \
cypress-firmware-43430-sdio \
cypress-nvram-43430-sdio-rpi-3b \
@ -126,12 +128,14 @@ define Device/rpi-3
DEVICE_DTS := \
broadcom/bcm2710-rpi-2-b \
broadcom/bcm2710-rpi-3-b broadcom/bcm2710-rpi-3-b-plus \
broadcom/bcm2710-rpi-cm3
broadcom/bcm2710-rpi-cm3 \
broadcom/bcm2710-rpi-zero-2
SUPPORTED_DEVICES := \
rpi-3-b rpi-3-b-plus \
rpi-3-b rpi-3-b-plus rpi-zero-2 \
raspberrypi,2-model-b-rev2 \
raspberrypi,3-model-b raspberrypi,3-model-b-plus \
raspberrypi,3-compute-module raspberrypi,compute-module-3
raspberrypi,3-compute-module raspberrypi,compute-module-3 \
raspberrypi,model-zero-2
DEVICE_PACKAGES := \
cypress-firmware-43430-sdio \
cypress-nvram-43430-sdio-rpi-3b \