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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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再过一周,我就将离开UNstudio阿姆斯特丹总部,到其上海分部了,鉴于上海分部目前还不承担设计任务,因此可以视为我UNstudio参与设计的体验即将告一段落。这个实习,原定3个月,后来被要求延长到了6个月,后来又延长到9个月,现在看来最终大概有11个月——那天一问,发现我的合同已经到了9月份了,赶紧声明不能这么长,我8月得回学校了。

《沸腾新十年》2007-2012

2007-2009 大幕拉启 早期玩iPhone的人觉得:它不支持复制粘贴、拍摄视频,也不能更改铃声、壁纸,还不能换电池、插存储卡,手机里的照片和备忘录等也没法复制到电脑中。(但它有Killing Feature是沉浸式的屏幕、上网功能) 在网龙的路演过程中,网龙创始人刘德建发现,在当时极为“高大上”的投资人群中,用iPhone已经蔚然成风 ──论有钱人带领的风潮 苹果早期是不支持第三方输入法的,这一问题要等到2014年iOS 8的推出才正式解决。 ──居然也封闭了整整七年 对于航班管家来说,好用户就是高频乘坐飞机出行的群体。以前,这个群体在哪里、如何捕捉,都是问题。但是iPhone的出现,天然筛选出了那些消费能力强劲的群体。 苹果公司和联通也在为没有好应用来推广iPhone而发愁,所以它们精选了6款应用。王江的航班管家和搜吃搜玩都得以入选,吃到了iPhone大推广时代的官方预装红利。 王江认为:“其实有了智能手机,才能说有了场景。你不拿着手机亲临其境,怎么叫场景呢? 触宝输入法,深合安卓早期创业的三大奥义:“高频、刚需、工具化”。 参赛是一个名利双收的大好机会,能帮助免费推广产品 魅族黄章对之前毫无保留地和雷军交流有些后悔:“我连M9的UI交互文档都发给过他,请他一起探讨。” 安卓早期的最大刚需之一是系统优化。 CyanogenMod因此成为当时全球最大的ROM开发和优化团队。 中国早期安卓生态的很大一部分是建立在CM的基础上的。最着名的有小米的MIUI团队、创新工场的点心团队、占据国内千元机市场的乐蛙OS团队等。 当时的盛大创新院群星璀璨,除了潘爱民和许式伟,还有樊一鹏“樊大师”,也有郝培强和霍炬,有极客余晟,有陆坚博士,有黄伟和吴义坚,有庄表伟,还有白宁等诸多牛人。 2012年夏天,华为的任正非在一个讲话中提到两个“备胎”计划,一个是关于芯片的,另一个就是关于操作系统的。 ──布局早在10年前 2009年,张一鸣决意离开饭否,转而去房产网站九九房,这是26岁的张一鸣从南开大学毕业后的4年里准备开启的第4段工作经历,每份工作平均也就一年多一点的时间。此时的张一鸣与大部分同龄人相比略显著急,稍显无措,全然没有日后那种长期思考的定力和耐性。 2009年12月底,王兴确定做美团。 ──原来也已经10年+ 2009年的“双11”购物节只是给淘宝商城团队找点事情的自我安慰...

Interview at the All Things Digital D5 Conference, Steve and Bill Gates spoke with journalists Kara Swisher and Walt Mossberg onstage in May 2007.

Kara Swisher: The first question I was interested in asking is what you think each has contributed to the computer and technology industry— starting with you, Steve, for Bill, and vice versa. Steve Jobs: Well, Bill built the first software company in the industry. And I think he built the first software company before anybody really in our industry knew what a software company was, except for these guys. And that was huge. That was really huge. And the business model that they ended up pursuing turned out to be the one that worked really well for the industry. I think the biggest thing was, Bill was really focused on software before almost anybody else had a clue that it was really the software that— KS: Was important? SJ: That’s what I see. I mean, a lot of other things you could say, but that’s the high-order bit. And I think building a company’s really hard, and it requires your greatest persuasive abilities to hire the best ...

Steve Jobs introduced the iPhone on January 9, 2007.

This is a day I’ve been looking forward to for two and a half years. Link Every once in a while, a revolutionary product comes along that changes everything. And Apple has been— well, first of all, one’s very fortunate if you get to work on just one of these in your career. Apple’s been very fortunate. It’s been able to introduce a few of these into the world. In 1984, we introduced the Macintosh. It didn’t just change Apple, it changed the whole computer industry. In 2001, we introduced the first iPod, and it didn’t just change the way we all listen to music, it changed the entire music industry. Well, today, we’re introducing three revolutionary products of this class. The first one is a widescreen iPod with touch controls. The second is a revolutionary mobile phone. And the third is a breakthrough internet communications device. So, three things: a widescreen iPod with touch controls; a revolutionary mobile phone; and a breakthrough internet communicat...

巴菲特致股东信-1972年

 笔记: 经营保险的思路是重视长期,不低价特别是不合理地低价抢保单 获得一笔长达20年的贷款,利率仅8% 原文: Link: https://xueqiu.com/6217262310/131103213 备份:https://archive.ph/fjGyy  the Stockholders of Berkshire Hathaway Inc.: Operating earnings of Berkshire Hathaway during 1972 amounted to a highly satisfactory 19.8% of beginning shareholders’ equity. Significant improvement was recorded in all of our major lines of business, but the most dramatic gains were in insurance underwriting profit. Due to an unusual convergence of favorable factors—diminishing auto accident frequency, moderating accident severity, and an absence of major catastrophes—underwriting profit margins achieved a level far above averages of the past or expectations of the future. While we anticipate a modest decrease in operating earnings during 1973, it seems clear that our diversification moves of recent years have established a significantly higher base of normal earning power. Yourpresent management assumed po...

巴菲特致股东信-1973年

 笔记: 在上一年度预测的今年竞争加剧导致利润下滑,真的发生了 翻译Link: 雪球:https://xueqiu.com/6217262310/131257618 备份:https://archive.ph/KIfdT 原文: To the Stockholders of Berkshire Hathaway Inc.: Our financial results for 1973 were satisfactory, with operating earnings of $11,930,592, producing a return of 17.4% on beginning stockholders' equity. Although operating earnings improved from $11.43 to $12.18 per share, earnings on equity decreased from the 19.8% of 1972. This decline occurred because the gain in earnings was not commensurate with the increase in shareholders' investment. We had forecast in last year's report that such a decline was likely. Unfortunately, our forecast proved to be correct. Our textile, banking, and most insurance operations had good years, but certain segments of the insurance business turned in poor results. Overall, our insurance business continues to be a most attractive area in which to employ capital. Management'...

巴菲特致股东信-1975年

 笔记: 华盛顿邮报已成为伯克希尔第一重仓股 翻译: 雪球:https://xueqiu.com/6217262310/131409324 备份:https://archive.ph/4hgK3 原文: To the Stockholders of Berkshire Hathaway Inc.: Last year, when discussing the prospects for 1975, we stated “the outlook for 1975 is not encouraging.” This forecast proved to be distressingly accurate. Our operating earnings for 1975 were $6,713,592, or $6.85 per share, producing a return on beginning shareholders ’ equity of 7.6%. This is the lowest return on equity experienced since 1967. Furthermore, as explained later in this letter, a large segment of these earnings resulted from Federal income tax refunds which will not be available to assist performance in 1976. On balance, however, current trends indicate a somewhat brighter 1976. Operations and prospects will be discussed in greater detail below, under specific industry titles. Our expectation is that significantly better results in textiles, earnings added from recent acquisitio...