Raspberry Pi 常见问题

# SPI & i2c
ls /dev/i2c-*
ls /dev/spidev*

/boot/config.txt

dtparam=spi=on
dtparam=i2c_arm=on

• 如果不需要也可以 blacklist
  • i2c_bcm2835
  • spi_bcm2835

闪电标志

• 电源不足警告

vcgencmd get_throttled

树莓派 4B 键盘不工作

• 可能是因为供电不足导致
• 或者使用 ssh 访问

echo max_usb_current=1 >> /boot/config.txt

树莓派 4 TypeC 设计缺陷

• 用不带 Emark Cable 的普通 USB-C 线缆来供电
• 苹果的 TypeC 线不行
• 最高 15W - 5V3A
• 参考
  • Raspberry Pi admits to faulty USB-C design on the Pi 4

没有 wlan0

lshw -short
dmesg | grep -i "brcmfmac\|firmware"
modprobe brcmfmac

• 可能 kernel bug
  • https://github.com/RaspAP/raspap-webgui/discussions/1606

/etc/modprobe.d/brcmfmac.conf

options brcmfmac feature_disable=0x82000

platform regulatory.0: Direct firmware load for regulatory.db failed with error -2

platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
cfg80211: failed to load regulatory.db

apk add wireless-regdb

task vchiq-keep/0:427 blocked for more than 362 seconds.

INFO: task vchiq-keep/0:427 blocked for more than 362 seconds.
      Not tainted 6.12.31-0-rpi #1-Alpine
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:vchiq-keep/0    state:D stack:0     pid:427   tgid:427   ppid:2      flags:0x00000008
Call trace:
 __switch_to+0xe8/0x140
 __schedule+0x38c/0xb64
 schedule+0x34/0x134
 schedule_preempt_disabled+0x24/0x40
 kthread+0xbc/0x120
 ret_from_fork+0x10/0x20

• VCHIQ (Video Core Image Queue)