樹莓派的啟動配置依靠/boot/config.txt來進行配置， 自己的HDMI屏幕是800X480的，其配置參數如下

此配置對使用ubuntu mate和noob來進行安裝的raspbian的都可以使用。

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

#hdmi_safe=1

一定要將此處的hdmi_safe=1注釋掉，否則會優先使用此配置

?

# uncomment this if your display has a black border of unused pixels visible

# and your display can output without overscan

#disable_overscan=1

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# 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

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

hdmi_force_hotplug=1

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# uncomment to force a specific HDMI mode (here we are forcing 800x480!)

hdmi_group=2

hdmi_mode=87

hdmi_cvt=800 480 60 6 0 0 0

此處的作用是使用DMT模式來配置HDMI， 并且添加HDMI mode 87其自定義的解析度為800x480刷新頻率為60幀

max_usb_current=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in

# DMT (computer monitor) modes

#hdmi_drive=2

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# 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

總結

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