blocks|key|972313|text|只需从/etc/init.d/rc文件中删除不需要应用程序，并在每次进程初始化后放入echo，并检查哪个进程启动花费了很多时间，如果您发现应用程序花费了更多的时间，则调试应用程序，依此类推。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|972314|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Just remove application which is not required from /etc/init.d/rc file also put echo after every process initialization and check which process is taking much time for starting,
if you find application which is taking more time then debug that application and so on.

blocks|key|754570|text|有一个程序可以帮助你知道大概的启动时间。检查此链接Time+Stamp。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|754571|entityMap|0|LINK|mutability|MUTABLE|url|https://gitorious.org/sitara-training/sitara-training-helper-files/source/b3a6a6a827b330ed8ce49b9260b83ee07ebdc008%253aboot_time_optimization/tstamp.c^0|P|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

There is program that can be helpful to know the approximate boot-up time. Check this link 
<a href="https://gitorious.org/sitara-training/sitara-training-helper-files/source/b3a6a6a827b330ed8ce49b9260b83ee07ebdc008%3aboot_time_optimization/tstamp.c" rel="nofollow">Time Stamp</a>.

blocks|key|754593|text|首先，你要做的最好的事情就是编译你自己制作的内核，在互联网上获取源代码，然后做一个make+xconfig，然后取消选择所有你不需要的东西。再次使用Buildroot和make+xconfig创建您自己的根文件系统，以选择/取消选择您需要或不需要的所有内容。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|754594|希望这能有所帮助。|754595|我也遇到了同样的问题，现在显然不一样了。)|754596|编辑:你需要的一切都将是here|754597|entityMap|0|LINK|mutability|MUTABLE|url|http://pandaboard.org/node/225/^0|15|C|2C|C|0|0|0|C|4|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|L|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]]]

First of all the best you have to do is to compile yourself your own made kernel, get the source on the internet and do a <code>make xconfig</code> and then unselected everythin you don't need.
In a second time create your own root filesystem using Buildroot and <code>make xconfig</code> to select/unselect everything you need or not.

Hope this help.

I had the same problem and do that way, now it's clearly not the same ;)

EDIT: Everything you need will be <a href="http://pandaboard.org/node/225/" rel="nofollow">here</a>

blocks|key|972366|text|要分析引导过程，您可以使用Bootchart2，它可以在github上找到：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|972367|或者Ubuntu软件包中的Bootchart：|972368|sudo+apt-get+update
sudo+apt-get+install+bootchart+pybootchartgui|code-block|syntax|javascript|972369|entityMap^0|D|A|0|D|9|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

to analyze the boot process, you can use Bootchart2, its available on github: <a href="https://github.com/mmeeks/bootchart" rel="nofollow">https://github.com/mmeeks/bootchart</a>

or Bootchart, from the Ubuntu packages:

<pre><code>sudo apt-get update
sudo apt-get install bootchart pybootchartgui
</code></pre>

blocks|key|972382|text|您可以在以下三个方面减少启动时间|type|unstyled|depth|inlineStyleRanges|entityRanges|data|972383|972384|引导加载程序:修改链接器脚本以仅初始化所需的硬件。此外，如果您使用SD卡启动，请合并内核和引导加载程序映像以节省时间。|ordered-list-item|972385|内核:从内核配置中删除不需要的模块。也可以尝试使用压缩和未压缩的图像。如果你的CPU足够好处理它，去压缩图像，并检查不同压缩类型所需的解压缩时间。|972386|文件系统:通过删除不需要的存储箱和库，可以显著减小文件系统大小。检查依赖项并仅使用所需的依赖项。|972387|972388|972389|​|972390|有关帮助测量引导时间的工具的更多技术和信息，请参阅以下链接。Refer+to+Training+Material|offset|length|972391|entityMap|0|LINK|mutability|MUTABLE|url|http://free-electrons.com/services/boot-time/^0|0|0|0|1|1|0|0|0|U|Q|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|11|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|12|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|13|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|16|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|17|8|@]|9|@$P|18|Q|19|1|1A]]|A|$]]|$1|R|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]]]

There are broadly 3 areas where you can reduce boot time

<ol>
<li>Bootloader:
Modify the linker script to initialize only the required h/w. Also, if you are using an SD card to boot, merge kernel and bootloader image to save time.</li>
<li>Kernel:
Remove unwanted modules from kernel config. Also try using compressed and uncompressed image. If your CPU is good enough to handle it go compressed image and check uncompression time required for different compression types.

<ol start="3">
<li>Filesystem:
FS size can be significantly reduced by removing the unwanted bins and libs. Check for dependencies and use only the one's that are required. </li>
</ol></li>
</ol>

For more techniques and information on tools that help in measuring the boot time please refer to the following link.
<a href="http://free-electrons.com/services/boot-time/" rel="nofollow">Refer to Training Material</a>

blocks|key|4538304|text|基本规则是:最快的代码是永远不会加载和运行的代码，所以删除所有不需要的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4538305|4538306|in+U-Boot:根本不要加载和运行完整的U-Boot；使用FALCON模式，让SPL直接加载Linux内核和DTB+in+Linux中的|unordered-list-item|4538307|：删除所有你不真正需要的驱动程序和其他东西；加载所有对核心应用程序不必要的驱动程序作为模块-并在应用程序启动后加载它们。如果您认真对待这个问题，您甚至可能希望最初只启动一个CPU核心(并在应用程序运行后启动其余的核心)。用户空间中的|4538308|：最小化根文件系统的大小。删除不需要的内容；配置工具(如busybox)以仅包含真正需要的功能；使用有效的代码(例如，链接到musl+libc而不是glibc)等。|4538309|4538310|通过组合所有这些措施可以获得什么，可以在这个video中看到-是的，这个优化的完整代码可以在here中找到。|offset|length|4538311|entityMap|0|LINK|mutability|MUTABLE|url|https://www.youtube.com/watch?v=piQEYyPpO2g|1|https://www.amazon.com/clouddrive/share/hVlzRXoJv1Jq4DJdgDcVnfmOWjARqR06eCfheWjRcSh^0|0|0|0|0|0|0|M|5|0|1A|4|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|10|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|12|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@$M|15|N|16|1|17]|$M|18|N|19|1|1A]]|A|$]]|$1|O|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]|W|$5|R|S|T|A|$U|X]]]]

The basic rule is: the fastest code is code that never gets loaded and
run, so remove everything you don't need:

<ul>
<li>in U-Boot: don't load and run the full U-Boot at all; use FALCON
mode and have the SPL load the Linux kernel and DTB directly</li>
<li>in Linux: remove all drivers and other stuff you don't really need;
load all drivers that are not essential for your core application as
modules - and load them after your application was started. If you
take this serious, you may even want to start only one CPU core
initially (and start the remaining ones after your application is
running).</li>
<li>in user space: minimize the size of the root file system. throuw
out anything you don't need; configure tools (like busybox) to
contain only the really needed functionality; use efficient code
(for example, link against musl libc instead of glibc) etc.</li>
</ul>

What can be acchieved by combining all these measures can be seen in
this <a href="https://www.youtube.com/watch?v=piQEYyPpO2g" rel="nofollow">video</a> - and yes, the complete code for this optimization is
available <a href="https://www.amazon.com/clouddrive/share/hVlzRXoJv1Jq4DJdgDcVnfmOWjARqR06eCfheWjRcSh" rel="nofollow">here</a>.

blocks|key|3070696|text|优化嵌入式Linux的引导过程，需要在嵌入式Linux设计的三个层次上进行修改。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3070697|注意:您需要bootloader和内核的源代码|3070698|3070699|启动:优化和减少板卡启动时间的第一步是优化启动加载程序。首先，你应该知道你的引导程序是什么。如果您的bootloader是一个开源的bootloader，比如u-boot，那么您有机会对其进行修改和优化。在u-boot中我们有一个过程，我们可以跳过不必要的系统检查，只需将内核映像上传到ram并启动即可。这方面的文档和说明可以在u-boot网站上找到。通过这样做，您将节省大约4~5秒的启动时间。|ordered-list-item|3070700|3070701|3070702|3070703|内核:为了拥有一个更快的内核，你应该在很多部分优化内核。对于编辑，您可以使用Linux配置菜单的上。我总是使用较低的图形菜单。它需要一些依赖项，您可以通过以下命令使用它：|3070704|3070705|$+make+menuconfig|3070706|我们对Linux内核的目标是拥有更小的内核映像和更少的引导模块。首先，将压缩算法从gzip改为LZO。这个动作的要点是gzip算法会花很多时间来提取内核。通过使用LZO，我们有一个更快的内核解压缩过程。第二，禁用任何不必要的驱动程序或模块，这些驱动程序或模块不在您的主板上，或者您不再使用它。这样做，您将失去一些设备访问，并且不能在Linux中使用它们，但您将获得两个积极的方面:更少的Ram使用，更快的启动时间。但请注意，有些驱动程序是Linux所必需的，禁用它们会使您失去所需的一些主要功能(例如，如果您禁用Linux中的I2C驱动程序，您将不再有HDMI接口)，或者在最坏的情况下，您将有一个启动问题(如启动循环)。第三是禁用一些不可用的文件系统，以减少内核大小和启动时间。四是去掉了一些压缩算法，使核图像更小。最后一件事，如果您使用的是u-boot引导加载程序，请创建一个uImage而不是zImage。以下步骤是一般和主要的操作，为了在电源连接后1秒内更快地启动，您应该更改更多选项。|3070707|3070708|3070709|经过两次基本层修改后，现在我们应该在用户空间(根文件系统)中优化引导过程。取决于你使用的是哪个系统，我们有不同的改变。在Linux的抽象根文件系统中，有引导Linux所需的软件包和系统，我们应该使用systemd而不是Unix+systemv，因为systemd具有多任务初始化。它是更快的，在那之后是udev，你应该修改一些加载模块。如果你有一个图形用户界面，我们可以使用一个简单的技巧，通过首先启动GUI并在加载GUI后加载其他模块来大大缩短启动时间。|3070710|3070711|如果您执行以下所有任务，则可以快速启动并快速处理系统。|3070712|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|13|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|K|3|L|5|G|7|17|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|19|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|T|3|U|5|G|7|1D|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1F|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|Z|$]]

Optimizing embedded Linux Boot process , needs modifications in three level of embedded Linux design. 

Note: you will need the source codes of bootloader and kernel

<ol>
<li>Boot : the first step in optimizing and reducing boot time of board is optimizing boot loader. first you should know what is your bootloader is. If your bootloader is an opensource bootloader like u-boot than you have the opportunity to modify and optimize it. In u-boot we have a procedure that we can skip unnecessary system check and just upload kernel image to ram and start. the documentation and instruction for this is available in u-boot website. by doing this you will save about 4 ~ 5 second in boot. </li>
</ol>

<hr>

<ol start="2">
<li>Kernel : for having a quicker kernel , you should optimize kernel in many sections. for editing you can use on of Linux config menu. I always use a low graphic menu. it need some dependency you can use it by this command:

$ make menuconfig 

our goal for Linux kernel is to have smaller kernel image and less module to load in boot. first change the algorithm of compression from gzip to LZO. the point of this action is gzip algorithm will take much time to extract kernel. by using LZO we have a quicker kernel decompression process. the second , disable any unnecessary driver or module that you don’t have it on your board or you don’t use it any more. by doing this , you will lose some device access and cannot use them in Linux but you will have two positive points: less Ram usage , quicker boot time. 
but please remind that some driver are necessary for Linux and by disabling them you will lose some of main features (for example if you disable I2C driver in Linux you will no longer have a HDMI interface) that you need or in worst case you will have a boot problem (such as boot-loop). The third is to disable some of unusable filesystem to reduce kernel size and boot time. The Fourth is to remove some of compression algorithm to have smaller kernel image. 
the last thing , If you are using a u-boot bootloader create a uImage instead of zImage. the following steps , are general and main actions , for having quicker boot as 1 second after power attach you should change more option. </li>
</ol>

<hr>

<ol start="3">
<li>after two base layer modifications, now we should optimize boot process in user-space (root file system). depend on witch system are you using , we have different changes to do. in abstract root file system of Linux that have necessary package and system to boot Linux we should use systemd instead of Unix systemv , because systemd have a multi-task init. system and it is faster , after that is udev that you should modify some of loading modules. if you have a graphical user-interface , we can use an easy trick to have a big boot time reduction by initing GUI first and load other module after loading GUI. </li>
</ol>

if you do all of following tasks , you can have quick boot time and fast system to work with.

I am doing project on Pandaboard using Embedded Linux (UBUNTU 12.10 Server Prebuild image) to optimize boot time. I need techniques or tools through which I can find boot time and techniques to optimize the boot time. If anyone can help.

Embedded Linux Boot Optimization

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用嵌入式Linux (UBUNTU 12.10服务器预建映像)在Pandaboard上做项目，以优化启动时间。我需要一些技术或工具，通过它们我可以找到启动时间和优化启动时间的技术。如果有人能帮上忙的话。

问嵌入式Linux引导优化
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回答 7

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