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在带有DAS U-Boot的Raspberry Pi计算模块上使用GPIO关机关闭PSU

device-tree u-boot gpio raspberry-pi linux

0

Matthew · 技术社区 · 9 年前

dtoverlay=gpio-poweroff,gpiopin=6,active_low=1

有了U-Boot,覆盆子皮靴可以正常工作,它甚至可以关机,但从不切换GPIO6。这使PSU保持运行,唯一的修复方法是按住电源按钮至少5秒钟。我知道dt blob。加载并应用bin,因为电路板有一个摄像头,只能与正确的dt blob一起工作。箱子

在这一点上,我已经没有主意了。我尝试过:

手动执行上述操作,并将反编译代码交织在一起。
fdt addr 和 fdt apply
克隆linux/arch/arm/boot/dts,编写一个MakeFile并用我的更改编译它们,会导致U-boot加载,Raspbian加载,但gpio关闭不起作用。
其他几乎不值得一提的尝试。

我尝试的一切似乎都不管用,我也不知道该往哪里走。

以下是一些正在使用的文件供参考:

#Setting default bootargs
setenv original_bootargs console=ttyS0 console=tty1 rootfstype=ext4 fsck.repair=yes hdmi.audio=0 disp.screen0_output_mode=1920x1080p60:1280x720p60:800x600p60:EDID rootwait panic=10 # console MUST be ttyS0 or it WILL NOT BOOT!

# Identify if we are using partition 2 or 3
if fatload mmc 0:1 ${loadaddr} swap; then echo "Using Partition 3"; setenv partition 3; else echo "Using Partition 2"; setenv partition 2; fi

# Check for recovery
if fatload mmc 0:1 ${loadaddr} recovery; then echo "Using Recovery Partition"; setenv partition 4; fi
#if gpio input 32 ||âfatload mmc 0:1 ${loadaddr} recovery; then echo "Using Recovery Partition"; setenv partition 4; fi

# Create an empty file to detect boot failures
fatwrite mmc 0:1 ${kernel_addr_r} recovery 0

# Set bootargs
setenv bootargs "${original_bootargs} root=/dev/mmcblk0p${partition}"

# Load the existing Linux kernel into RAM
echo Loading partition ${partition}
ext4load mmc 0:${partition} ${kernel_addr_r} kernel.img
# Boot the kernel we have just loaded
bootz ${kernel_addr_r} - ${fdt_addr}

不知道为什么,但它以低分辨率启动,红色和蓝色互换。编译时使用 mkimage -A arm -O linux -T script -C none -a 0x00000000 -e 0x00000000 -n "Boot Script" -d boot.cmd boot.scr

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
#dtparam=audio=on

gpu_mem=128

start_x=1

dtoverlay=gpio-poweroff,gpiopin=6,active_low=1

dtdebug=1

2 回复 | 直到 9 年前

1

Matthew 9 年前

所以,我通过编译我自己的bcm27***多少修复了它。dtb文件,在其原始内容之后连接以下内容:

/ {
    compatible = "brcm,bcm2709";

   power_ctrl: power_ctrl {
       compatible = "gpio-poweroff";
       gpios = <&gpio 6 1>;
   };
};

2

1

Matthew 9 年前

我做到了,答案如下:

# Manually apply overlay
setenv fdt_length 50000
setexpr kernel_addr_r ${fdt_addr} + ${fdt_length}
fdt addr ${fdt_addr} # Load the existing tree
fdt boardsetup # Device specific setup
fdt move ${fdt_addr} ${fdt_addr} ${fdt_length} # Resize the loaded fdt to ${fdt_length}
fatload mmc 0:1 ${kernel_addr_r} overlays/gpio-poweroff.dtbo
fdt apply ${kernel_addr_r} # Apply the overlay

编辑默认设备树和dt blob。宾最终以徒劳告终。您需要做的是自己在uboot内手动应用覆盖。src。

在应用覆盖之前,您需要使用 fdt move ,然后您可以从fat加载和应用。如果要应用更多覆盖,只需添加其他行,例如:

fatload mmc 0:1 ${kernel_addr_r} overlays/rpi-tv.dtbo
fdt apply ${kernel_addr_r} # Apply the overlay