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配置与学习树莓派config.txt配置文件

配置树莓派config.txt文件

windows pc下配置

  • 将SD卡通过读卡器连接到PC。
  • 打开config.txt文件,或新建这样一个文件。
  • 配置config.txt。
    • hdmi_force_hotplug=1 强制伪装成HDMI输出
    • hdmi_drive=2 当你选择通过HDMI显示输出时,需要选择2,如果是DVI输出,则该项为1
    • hdmi_group=2 设置HDMI类型,1为CEA,2为DMT
    • hdmi_mode=16 设置屏幕分辨率,见后文
    • config_hdmi_boost=4 设置HDMI接口信号强度,抗干扰
    • sdtv_mode=2 PAL制式
    • arm_freq=800 主频
  • 将SD卡重新插回树莓派并启动。

配置说明

概述

由于树莓派没有传统的BIOS,所以它的各种配置文件被存放在一个名为config.txt的文件中。
树莓派的config.txt会在内核初始化之前被GPU读取。

文件格式

默认的,该文件中任何配置都是通过#来注释的,如果需要配置对应项,则需要将行首的#删除。

配置项

内存

      disable_I2cache     : 禁止ARM访问GPU的二级缓存,相应的需要在内核中关闭二级缓存,默认为0
      gpu_mem     : GPU内存以M为单位,设置ARM和GPU之间的内存分配。ARM会获得剩余所有内存,最小设16,默认64
      gpu_mem_256     : 对于有256MB内存的树莓派的GPU设置,会覆盖gpu_mem,最大设192,默认不设置
      gpu_mem_512     : 对于有512MB内存的树莓派的GPU设置, 会覆盖gpu_mem,最大设448,默认不设置
      disable_pvt     : 禁止每500毫秒调整一次RAM的刷新率(RAM温度测量)

CAM - 动态内存分配

      cma_lwm     : 当GPU可用内存低于cma_lwm所设值,将向ARM请求一些内存
      cma_hwm     : 当GPU可用内存高于cma_hwm所设值,将向ARM释放一些内存
要启动CMA,下边的参数要添加到cmdline.txt文件中:
  1. coherent_pool=6M smsc95xx.turbo_mode=N

视频

sdtv_mode 为复合信号输出设置视频制式(默认为0)
sdtv_mode=0 NTSC,日本和美国主要用这个
sdtv_mode=1 日本版NTSC – 无基座
sdtv_mode=2 PAL,国内和欧洲主要用这个
sdtv_mode=3 巴西版PAL – 副载波为525/60而不是625/50
sdtv_aspect 为复合信号输出设置宽高比(默认为1)
sdtv_aspect=1 4:3
sdtv_aspect=2 14:9
sdtv_aspect=3 16:9
sdtv_disable_colourburst 禁止复合信号输出彩色副载波群. 图片会显示为单色, 但是可能会更清晰
sdtv_disable_colourburst=1 禁止输出彩色副载波群
hdmi_safe 使用"安全模式"的设置去尝试用HDMI最大兼容性启动. 这和下面的组合是一个意思: hdmi_force_hotplug=1, config_hdmi_boost=4, hdmi_group=2, hdmi_mode=4, disable_overscan=0
hdmi_safe=1
hdmi_ignore_edid 如果你的显示器是天朝产的垃圾货, 允许系统忽略EDID显示数据
hdmi_ignore_edid=0xa5000080
hdmi_edid_file 当设为1时, 将会从edid.dat文件中读取EDID数据,而不是从显示器.[1]
hdmi_edid_file=1
hdmi_force_edid_audio 伪装成支持所有音频格式播放, 即便报告不支持也允许通过DTS/AC3.
hdmi_force_edid_audio=1
hdmi_force_edid_3d 伪装成全部CEA模式都支持3D, 即便EDID并不支持.
hdmi_force_edid_3d=1
avoid_edid_fuzzy_match 禁止去模糊匹配EDID中描述的模式. 即便遮蔽错误, 也选用匹配分辨率和最接近帧率的标准模式.
avoid_edid_fuzzy_match=1
hdmi_ignore_cec_init 不发送初始化激活源消息. 避免在重启时使(启用CEC)TV结束待机并切换频道.
hdmi_ignore_cec_init=1
hdmi_ignore_cec 伪装成TV不支持CEC. 将不会支持任何CEC功能.
hdmi_ignore_cec=1
hdmi_force_hotplug 伪装成HDMI热插拔信号被检测到, 出现HDMI显示器被接入
hdmi_force_hotplug=1 即便没有检测到HDMI显示器也要使用HDMI模式
hdmi_ignore_hotplug 伪装成HDMI热插拔信号没有被检测到, 出现HDMI显示器未接入
hdmi_ignore_hotplug=1 即便检测到HDMI显示器也要使用混合模式
hdmi_pixel_encoding 强制像素编码模式. 默认情况下会使用EDID请求的模式, 所以不需要修改.
hdmi_pixel_encoding=0 default (limited for CEA, full for DMT)
hdmi_pixel_encoding=1 RGB limited (16-235)
hdmi_pixel_encoding=2 RGB full ( 0-255)
hdmi_pixel_encoding=3 YCbCr limited (16-235)
hdmi_pixel_encoding=4 YCbCr limited ( 0-255)
hdmi_drive 选择HDMI还是DVI模式
hdmi_drive=1 DVI模式 (没声音)
hdmi_drive=2 HDMI模式 (如果支持并已启用将有声音输出)
hdmi_group 设置HDMI类型
不指定组, 或者设为0, 将会使用EDID报告的首选组.
hdmi_group=1 CEA
hdmi_group=2 DMT
hdmi_mode 设置在CEA或DMT格式下的屏幕分辨率
当hdmi_group=1 (CEA)时,下列值有效
hdmi_mode=1 VGA
hdmi_mode=2 480p 60Hz
hdmi_mode=3 480p 60Hz H
hdmi_mode=4 720p 60Hz
hdmi_mode=5 1080i 60Hz
hdmi_mode=6 480i 60Hz
hdmi_mode=7 480i 60Hz H
hdmi_mode=8 240p 60Hz
hdmi_mode=9 240p 60Hz H
hdmi_mode=10 480i 60Hz 4x
hdmi_mode=11 480i 60Hz 4x H
hdmi_mode=12 240p 60Hz 4x
hdmi_mode=13 240p 60Hz 4x H
hdmi_mode=14 480p 60Hz 2x
hdmi_mode=15 480p 60Hz 2x H
hdmi_mode=16 1080p 60Hz
hdmi_mode=17 576p 50Hz
hdmi_mode=18 576p 50Hz H
hdmi_mode=19 720p 50Hz
hdmi_mode=20 1080i 50Hz
hdmi_mode=21 576i 50Hz
hdmi_mode=22 576i 50Hz H
hdmi_mode=23 288p 50Hz
hdmi_mode=24 288p 50Hz H
hdmi_mode=25 576i 50Hz 4x
hdmi_mode=26 576i 50Hz 4x H
hdmi_mode=27 288p 50Hz 4x
hdmi_mode=28 288p 50Hz 4x H
hdmi_mode=29 576p 50Hz 2x
hdmi_mode=30 576p 50Hz 2x H
hdmi_mode=31 1080p 50Hz
hdmi_mode=32 1080p 24Hz
hdmi_mode=33 1080p 25Hz
hdmi_mode=34 1080p 30Hz
hdmi_mode=35 480p 60Hz 4x
hdmi_mode=36 480p 60Hz 4xH
hdmi_mode=37 576p 50Hz 4x
hdmi_mode=38 576p 50Hz 4x H
hdmi_mode=39 1080i 50Hz reduced blanking
hdmi_mode=40 1080i 100Hz
hdmi_mode=41 720p 100Hz
hdmi_mode=42 576p 100Hz
hdmi_mode=43 576p 100Hz H
hdmi_mode=44 576i 100Hz
hdmi_mode=45 576i 100Hz H
hdmi_mode=46 1080i 120Hz
hdmi_mode=47 720p 120Hz
hdmi_mode=48 480p 120Hz
hdmi_mode=49 480p 120Hz H
hdmi_mode=50 480i 120Hz
hdmi_mode=51 480i 120Hz H
hdmi_mode=52 576p 200Hz
hdmi_mode=53 576p 200Hz H
hdmi_mode=54 576i 200Hz
hdmi_mode=55 576i 200Hz H
hdmi_mode=56 480p 240Hz
hdmi_mode=57 480p 240Hz H
hdmi_mode=58 480i 240Hz
hdmi_mode=59 480i 240Hz H
H表示16:9比例(正常是4:3).
2x表示双倍像素(即更高的像素时脉, 每个像素重复两次)
4x表示四倍像素(即更高的像素时脉, 每个像素重复四次)
当hdmi_group=2 (DMT)时,下列值有效
警告: 根据这篇帖子所述
像素时脉是有限制的, 最高支持的模式是1920x1200 @60Hz with reduced blanking.
hdmi_mode=1 640x350 85Hz
hdmi_mode=2 640x400 85Hz
hdmi_mode=3 720x400 85Hz
hdmi_mode=4 640x480 60Hz
hdmi_mode=5 640x480 72Hz
hdmi_mode=6 640x480 75Hz
hdmi_mode=7 640x480 85Hz
hdmi_mode=8 800x600 56Hz
hdmi_mode=9 800x600 60Hz
hdmi_mode=10 800x600 72Hz
hdmi_mode=11 800x600 75Hz
hdmi_mode=12 800x600 85Hz
hdmi_mode=13 800x600 120Hz
hdmi_mode=14 848x480 60Hz
hdmi_mode=15 1024x768 43Hz DO NOT USE
hdmi_mode=16 1024x768 60Hz
hdmi_mode=17 1024x768 70Hz
hdmi_mode=18 1024x768 75Hz
hdmi_mode=19 1024x768 85Hz
hdmi_mode=20 1024x768 120Hz
hdmi_mode=21 1152x864 75Hz
hdmi_mode=22 1280x768 reduced blanking
hdmi_mode=23 1280x768 60Hz
hdmi_mode=24 1280x768 75Hz
hdmi_mode=25 1280x768 85Hz
hdmi_mode=26 1280x768 120Hz reduced blanking
hdmi_mode=27 1280x800 reduced blanking
hdmi_mode=28 1280x800 60Hz
hdmi_mode=29 1280x800 75Hz
hdmi_mode=30 1280x800 85Hz
hdmi_mode=31 1280x800 120Hz reduced blanking
hdmi_mode=32 1280x960 60Hz
hdmi_mode=33 1280x960 85Hz
hdmi_mode=34 1280x960 120Hz reduced blanking
hdmi_mode=35 1280x1024 60Hz
hdmi_mode=36 1280x1024 75Hz
hdmi_mode=37 1280x1024 85Hz
hdmi_mode=38 1280x1024 120Hz reduced blanking
hdmi_mode=39 1360x768 60Hz
hdmi_mode=40 1360x768 120Hz reduced blanking
hdmi_mode=41 1400x1050 reduced blanking
hdmi_mode=42 1400x1050 60Hz
hdmi_mode=43 1400x1050 75Hz
hdmi_mode=44 1400x1050 85Hz
hdmi_mode=45 1400x1050 120Hz reduced blanking
hdmi_mode=46 1440x900 reduced blanking
hdmi_mode=47 1440x900 60Hz
hdmi_mode=48 1440x900 75Hz
hdmi_mode=49 1440x900 85Hz
hdmi_mode=50 1440x900 120Hz reduced blanking
hdmi_mode=51 1600x1200 60Hz
hdmi_mode=52 1600x1200 65Hz
hdmi_mode=53 1600x1200 70Hz
hdmi_mode=54 1600x1200 75Hz
hdmi_mode=55 1600x1200 85Hz
hdmi_mode=56 1600x1200 120Hz reduced blanking
hdmi_mode=57 1680x1050 reduced blanking
hdmi_mode=58 1680x1050 60Hz
hdmi_mode=59 1680x1050 75Hz
hdmi_mode=60 1680x1050 85Hz
hdmi_mode=61 1680x1050 120Hz reduced blanking
hdmi_mode=62 1792x1344 60Hz
hdmi_mode=63 1792x1344 75Hz
hdmi_mode=64 1792x1344 120Hz reduced blanking
hdmi_mode=65 1856x1392 60Hz
hdmi_mode=66 1856x1392 75Hz
hdmi_mode=67 1856x1392 120Hz reduced blanking
hdmi_mode=68 1920x1200 reduced blanking
hdmi_mode=69 1920x1200 60Hz
hdmi_mode=70 1920x1200 75Hz
hdmi_mode=71 1920x1200 85Hz
hdmi_mode=72 1920x1200 120Hz reduced blanking
hdmi_mode=73 1920x1440 60Hz
hdmi_mode=74 1920x1440 75Hz
hdmi_mode=75 1920x1440 120Hz reduced blanking
hdmi_mode=76 2560x1600 reduced blanking
hdmi_mode=77 2560x1600 60Hz
hdmi_mode=78 2560x1600 75Hz
hdmi_mode=79 2560x1600 85Hz
hdmi_mode=80 2560x1600 120Hz reduced blanking
hdmi_mode=81 1366x768 60Hz
hdmi_mode=82 1080p 60Hz
hdmi_mode=83 1600x900 reduced blanking
hdmi_mode=84 2048x1152 reduced blanking
hdmi_mode=85 720p 60Hz
hdmi_mode=86 1366x768 reduced blanking
overscan_left 左侧跳过像素数
overscan_right 右侧跳过像素数
overscan_top 顶部跳过像素数
overscan_bottom 底部跳过像素数
framebuffer_width 控制台framebuffer宽度, 以像素为单位. 默认是显示器宽度减去超出扫描.
framebuffer_height 控制台framebuffer高度, 以像素为单位. 默认是显示器高度减去超出扫描.
framebuffer_depth 控制台framebuffer深度, 以位为单位. 默认是16位. 8位也是有效的, 但是默认RGB调色板会导致屏幕不可读. 24位效果更好 ,但是2012年6月15号发现有显示混乱问题. 32位没有混乱问题, 但是需要设置framebuffer_ignore_alpha=1, 并在2012年6月15号发现颜色显示错误.
framebuffer_ignore_alpha 设为1将禁用alpha通道. 仅对32位有效.
test_mode 允许在启动时做声音与图像测试.
disable_overscan 设为1将禁用超出扫描.
config_hdmi_boost 设置HDMI接口的信号强度. 默认为0. 如果出现HDMI干扰问题可以试试设为4. 最大为7.
display_rotate 顺时针旋转屏幕显示 (默认为0) 或者翻转显示.
display_rotate=0 正常
display_rotate=1 90度
display_rotate=2 180度
display_rotate=3 270度
display_rotate=0x10000 水平翻转
display_rotate=0x20000 垂直翻转
注意: 旋转90度或者270度额外需要GPU内存, 所以在GPU只分配到16M的时候旋转会无效. 可能的原因:Crashes my RPI before Linux boots if set to "1" -- REW 20120913.

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I grew up as an only child, with a single mother. Because we were poor and because I knew my father had emigrated from Syria, I imagined he looked like Omar Sharif. I hoped he would be rich and kind and would come into our lives (and our not yet furnished apartment) and help us. Later, after I’d met my father, I tried to believe he’d changed his number and left no forwarding address because he was an idealistic revolutionary, plotting a new world for the Arab people. Even as a feminist, my whole life I’d been waiting for a man to love, who could love me. For decades, I’d thought that man would be my father. When I was 25, I met that man and he was my brother. By then, I lived in New York, where I was trying to write my first novel. I had a job at a small magazine in an office the size of a closet, with three other aspiring writers. When one day a lawyer called me — me, the middle-class girl from California who hassled the boss to buy us health insurance — and said his cl...

360T7 刷机步骤及固件

https://cmi.hanwckf.top/p/360t7-firmware/   360T7的固件支持由immortalwrt-mt798x项目提供支持,请参考: https://cmi.hanwckf.top/p/immortalwrt-mt798x https://github.com/hanwckf/immortalwrt-mt798x 刷机步骤 参考 此处 的办法开启原厂固件的UART和telnet功能 在以下链接下载360T7测试固件(纯净版,无任何插件) https://wwd.lanzout.com/b0bt9idwd 密码:ezex (此固件已过时,请选择其它更新的固件) 接下来将刷入修改版uboot。修改版uboot的优点有: 固件分区可达108MB,原厂uboot只能使用36M 自带一个简单的webui恢复页面 到以下仓库的Release页面下载uboot,目前暂时仅支持360T7,后续将支持更多mt798x路由器。 推荐使用 mt7981_360t7-fip-fixed-parts.bin , fixed-parts 代表uboot分区表在编译期间固定,不会随着uboot环境变量变化。 https://github.com/hanwckf/bl-mt798x/releases/latest 将 mt7981_360t7-fip-fixed-parts.bin 通过HFS等方式上传到路由器,使用以下命令刷入uboot mtd write mt7981_360t7-fip-fixed-parts.bin fip 确认刷入完毕后,拔掉路由器电源。然后将电脑的IP地址设置为固定的 192.168.1.2 ,接着按住路由器的RESET按钮后通电开机,等待8s后用浏览器进入 192.168.1.1 在uboot恢复页面选择要刷入的固件。immortalwrt-mt798x目前编译两个版本的360T7固件。 建议修改版uboot直接使用 immortalwrt-mediatek-mt7981-mt7981-360-t7-108M-squashfs-factory.bin ,两种固件区别如下: mt7981-360-t7-108M 为108M固件分区,原厂uboot不可启动,需要修改版u...

Steve Jobs talks about the difference between art and technology

  When asked by   Time   magazine about the difference between art and technology, Jobs said, “I’ve never believed that they’re separate. Leonardo da Vinci was a great artist and a great scientist. Michelangelo knew a tremendous amount about how to cut stone at the quarry. The finest dozen computer scientists I know are all musicians. Some are better than others, but they all consider that an important part of their life. I don’t believe that the best people in any of these fields see themselves as one branch of a forked tree. I just don’t see that. People bring these things together a lot. Dr. Land at Polaroid said, ‘I want Polaroid to stand at the intersection of art and science,’ and I’ve never forgotten that. I think that that’s possible, and I think a lot of people have tried.”

ISSUU使用指南--木喵

作者: 木喵   出处: Wonderworks 问:issuu是什么? 答:Issuu是国外的一个在线文档共享网站,它是你的PDF文档发布专家。它类似于我们熟悉的youtube,但它共享的是文档、杂志之类的文本。 简而言之、同志们想看国外的各种杂志? 想找国外的汇报文本么? 想借鉴国外学生的作品集么? 那么你就要用到它啦~ 今天主要和大家讲两个方面 一、如何在pc端使用和下载issuu上的pdf文档 首先我们打开issuu的网址 https://issuu.com/ 我们可以很清楚的看到网页上呢都是国外的杂志以及一些作者自己制作的pdf文档 首先我们点击右上角的 sign up  然后填写相关信息注册一个账户: 注册完成之后我们就可以搜索我们想要找的资料: 比如说,我想找一些分析图的资料,我们就搜索: architecture diagram 然后我们就可以看到相关的文档了: 点击你所选择的文档, 好了问题来了: sorry,this publication is not available 这个时候!就需要在用pc端的我们做一件必不可少的事: 翻墙 然后我们就能将页面刷新粗来了 好、接下来是非常有建设性意义的一步 怎样把我们网页上的文件 下载下来 呢? 截图? no~no~no~ 接下来,让木喵告诉你怎么下载: 首先你需要复制上面的网址 然后将 https://wenfan.hk/issuu/index_link.php 在另一个网址中打开 将你之前复制的pdf的网址粘贴在下面的对话框中 点击 I‘m not a robot 再点击 get it 然后会出现一堆网址代码 我们 全选 打开你的迅雷点击 新建 将你之前的复制粘贴到下载链接里 然后呢~我们就全都下载成功啦~ 然后我们回到之前的网页向下看 我们可以看到有上传文档的作者(记得要关注哟) 然后还有 info   share   stack   ❤ 如果...