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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/boot/fitImage_1.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">FIT Image 配置和启动</h1><div class="date inPage">28 May 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d95585e22__20250121171534">FIT，即 Flattened Image Tree，是参考 Flattened Device Tree 命令而来，具有以下优势。<ul class="- topic/ul ul" id="fitImage_1__ul_n2w_xdh_bzb" data-ofbid="fitImage_1__ul_n2w_xdh_bzb"><li class="- topic/li li" data-ofbid="d95585e25__20250121171534">
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<p class="- topic/p p" data-ofbid="d95585e27__20250121171534">更灵活的处理各种类型的 image 类型(压缩、非压缩、各种格式，各种配置组合)</p>
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</li><li class="- topic/li li" data-ofbid="d95585e30__20250121171534">
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<p class="- topic/p p" data-ofbid="d95585e32__20250121171534">可以处理安全启动过程中的安全校验（签名校验）</p>
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</li></ul></div><div class="- topic/p p" data-ofbid="d95585e35__20250121171534">FIT
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原始参考文档如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="fitImage_1__codeblock_ann_sqr_c1c" data-ofbid="fitImage_1__codeblock_ann_sqr_c1c">source/uboot-<span class="hl-number">2021.10</span>/doc/usage/fit.rst
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source/uboot-<span class="hl-number">2021.10</span>/doc/uImage.FIT/howto.txt
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source/uboot-<span class="hl-number">2021.10</span>/doc/uImage.FIT/source_file_format.txt
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source/uboot-<span class="hl-number">2021.10</span>/doc/uImage.FIT/command_syntax_extensions.txt</pre></div><div class="- topic/p p" data-ofbid="d95585e39__20250121171534">Flattened Image Tree，使用 DTS 的语法， 通过一些新增的节点，描述生成镜像文件所使用的 Image 文件和配置。下文以
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<span class="+ topic/ph sw-d/filepath ph filepath">source/uboot-2021.10/doc/uImage.FIT/kernel_fdt.its</span>
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为例进行说明：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="fitImage_1__codeblock_h2c_tqr_c1c" data-ofbid="fitImage_1__codeblock_h2c_tqr_c1c">/dts-v1/;
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/ {
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description = <span class="hl-string">"Simple image with single Linux kernel and FDT blob"</span>;
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#address-cells = <<span class="hl-number">1</span>>;
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images {
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kernel {
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description = <span class="hl-string">"Vanilla Linux kernel"</span>;
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data = /incbin/(<span class="hl-string">"./vmlinux.bin.gz"</span>);
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type = <span class="hl-string">"kernel"</span>;
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arch = <span class="hl-string">"ppc"</span>;
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os = <span class="hl-string">"linux"</span>;
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compression = <span class="hl-string">"gzip"</span>;
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load = <<span class="hl-number">00000000</span>>;
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entry = <<span class="hl-number">00000000</span>>;
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hash-<span class="hl-number">1</span> {
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algo = <span class="hl-string">"crc32"</span>;
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};
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hash-<span class="hl-number">2</span> {
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algo = <span class="hl-string">"sha1"</span>;
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};
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};
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fdt-<span class="hl-number">1</span> {
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description = <span class="hl-string">"Flattened Device Tree blob"</span>;
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data = /incbin/(<span class="hl-string">"./target.dtb"</span>);
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type = <span class="hl-string">"flat_dt"</span>;
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arch = <span class="hl-string">"ppc"</span>;
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compression = <span class="hl-string">"none"</span>;
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hash-<span class="hl-number">1</span> {
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algo = <span class="hl-string">"crc32"</span>;
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};
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hash-<span class="hl-number">2</span> {
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algo = <span class="hl-string">"sha1"</span>;
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};
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};
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};
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configurations {
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<strong class="hl-keyword">default</strong> = <span class="hl-string">"conf-1"</span>;
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conf-<span class="hl-number">1</span> {
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description = <span class="hl-string">"Boot Linux kernel with FDT blob"</span>;
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kernel = <span class="hl-string">"kernel"</span>;
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fdt = <span class="hl-string">"fdt-1"</span>;
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};
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};
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};</pre></div><p class="- topic/p p" data-ofbid="d95585e46__20250121171534">上述示例包含了其中包含了 fdt + kernel，以及校验方式的配置。</p><div class="- topic/p p" data-ofbid="d95585e48__20250121171534">FIT image 启动命令说明如下：<ul class="- topic/ul ul" id="fitImage_1__ul_nqm_zqy_nbc" data-ofbid="fitImage_1__ul_nqm_zqy_nbc"><li class="- topic/li li" data-ofbid="d95585e51__20250121171534">
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<div class="- topic/p p" data-ofbid="d95585e53__20250121171534">生成 itb image
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的命令：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="fitImage_1__codeblock_vb1_5qr_c1c" data-ofbid="fitImage_1__codeblock_vb1_5qr_c1c">mkimage -f kernel_fdt.its kernel_fdt.itb</pre></div>
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</li><li class="- topic/li li" data-ofbid="d95585e58__20250121171534">
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<div class="- topic/p p" data-ofbid="d95585e60__20250121171534">使用默认的配置进行启动：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="fitImage_1__codeblock_m24_5qr_c1c" data-ofbid="fitImage_1__codeblock_m24_5qr_c1c">bootm <kernel itb addr></pre></div>
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</li><li class="- topic/li li" data-ofbid="d95585e65__20250121171534">
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<div class="- topic/p p" data-ofbid="d95585e67__20250121171534">如果 its 中有多个配置，可以指定启动的配置组合，例如 bootm
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0x81000000#conf-2。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="fitImage_1__codeblock_u5z_5qr_c1c" data-ofbid="fitImage_1__codeblock_u5z_5qr_c1c">bootm <kernel itb addr>#<conf-name>
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</pre></div>
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</li></ul></div><p class="- topic/p p" data-ofbid="d95585e72__20250121171534">更多说明请参考：source/uboot-2021.10/doc/uImage.FIT/command_syntax_extensions.txt</p></div></article></main></div>
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