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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/boot-memory.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">内存相关</h1><div class="date inPage">3 Dec 2024</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="_1601_0__section_bws_cbd_ndc" data-ofbid="_1601_0__section_bws_cbd_ndc"><h2 class="- topic/title title sectiontitle">DDR 初始化</h2>
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<p class="- topic/p p" data-ofbid="d297673e27__20250121171803">BROM 阶段仅系统 SRAM 可用，大小为 96 KB。在 BROM 阶段 Cache 关闭，SRAM 的运行频率为 24 MHz.</p>
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<p class="- topic/p p" data-ofbid="d297673e30__20250121171803">DDR 的初始化在 PreBoot Program (PBP) 程序中进行。PBP 是保存在 AIC 启动镜像中的一段程序， BROM 在运行 SPL 之前先运行 PBP
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程序，PBP 程序执行成功之后，才跳转执行 SPL 程序。</p>
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<div class="- topic/p p" data-ofbid="d297673e33__20250121171803">PBP 程序的主要功能是完成 DDR 初始化。<div class="- topic/note note note note_note" id="_1601_0__note_sh2_vjr_c1c" data-ofbid="_1601_0__note_sh2_vjr_c1c"><span class="note__title">注：</span> PBP 阶段，并不会使能 Cache，Cache 的使能放在 SPL
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阶段执行。</div></div>
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</section><section class="- topic/section section" id="_1601_0__section_sz5_2bd_ndc" data-ofbid="_1601_0__section_sz5_2bd_ndc"><h2 class="- topic/title title sectiontitle">Cache</h2>
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<p class="- topic/p p" data-ofbid="d297673e43__20250121171803">由于打开 Cache 对程序执行效率和内存访问效率都有很大的提升，SPL 的配置默认打开 I-Cache 和 D-Cache。使能 Cache 的流程如下：</p>
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<ul class="- topic/ul ul" id="_1601_0__ul_zt1_szg_bzb" data-ofbid="_1601_0__ul_zt1_szg_bzb"><li class="- topic/li li" data-ofbid="d297673e47__20250121171803">SPL 阶段，执行时立刻使能 I-Cache。</li><li class="- topic/li li" data-ofbid="d297673e49__20250121171803">SPL 退出时不关闭 Cache，因此后续 OpenSBI、U-Boot 阶段，默认是在 Cache 使能的情况下运行的。<div class="- topic/note note note note_note" id="_1601_0__note_gvn_ckr_c1c" data-ofbid="_1601_0__note_gvn_ckr_c1c"><span class="note__title">注：</span>
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<ul class="- topic/ul ul" id="_1601_0__ol_vp4_ckr_c1c" data-ofbid="_1601_0__ol_vp4_ckr_c1c"><li class="- topic/li li" data-ofbid="d297673e54__20250121171803">RISCV CPU 中，Cache 与 MMU 两个功能是分开设置的。此处只描述 Cache 的相关配置，与 MMU
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没有关系。</li><li class="- topic/li li" data-ofbid="d297673e56__20250121171803">Cache 的使能必须在 RISCV M-Mode 下操作，由于 U-Boot 运行在 S-Mode，因此 U-Boot 阶段不能开关
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Cache。</li></ul>
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</div></li></ul>
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<p class="- topic/p p" data-ofbid="d297673e60__20250121171803">ArtInChip 平台默认使能 I-Cache 和 D-Cache，如果需要关闭相关功能，可以使用下面的配置：</p>
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<ul class="- topic/ul ul" id="_1601_0__ul_n3p_5k3_p1c" data-ofbid="_1601_0__ul_n3p_5k3_p1c"><li class="- topic/li li" data-ofbid="d297673e64__20250121171803">CONFIG_SYS_ICACHE_OFF</li><li class="- topic/li li" data-ofbid="d297673e66__20250121171803">CONFIG_SYS_DCACHE_OFF</li></ul>
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<div class="table-container"><table class="- topic/table table frame-all" id="_1601_0__table_bsx_vk3_p1c" data-ofbid="_1601_0__table_bsx_vk3_p1c" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">Cache 相关 API</span></caption><colgroup><col style="width:51.982378854625544%"/><col style="width:22.026431718061673%"/><col style="width:25.991189427312772%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__table_bsx_vk3_p1c__entry__1">API</th><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__table_bsx_vk3_p1c__entry__2">SPL 可用</th><th class="- topic/entry entry colsep-0 rowsep-1" id="_1601_0__table_bsx_vk3_p1c__entry__3">U-Boot 可用</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">icache_enable</span></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">icache_disable</span></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">icache_status</span></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">dcache_enable</span></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">dcache_disable</span></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">dcache_status</span></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">flush_dcache_all</span></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__3">是</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">flush_dcache_range</span></td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__table_bsx_vk3_p1c__entry__3">是</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__table_bsx_vk3_p1c__entry__1"><span class="+ topic/keyword pr-d/apiname keyword apiname">invalidate_dcache_range</span></td><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__table_bsx_vk3_p1c__entry__2">是</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="_1601_0__table_bsx_vk3_p1c__entry__3">是</td></tr></tbody></table></div>
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<p class="- topic/p p" data-ofbid="d297673e159__20250121171803">其实现在 <span class="+ topic/ph sw-d/filepath ph filepath">arch/riscv/cpu/c906/cache.c</span> 。</p>
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<div class="- topic/p p" data-ofbid="d297673e165__20250121171803">SPL 中 Cache
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初始化流程如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="_1601_0__codeblock_i3h_wk3_p1c" data-ofbid="_1601_0__codeblock_i3h_wk3_p1c">_start <em class="hl-comment">// arch/riscv/cpu/start.S</em>
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|-> save_boot_params
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|-> board_init_f_alloc_reserve
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|-> harts_early_init
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|-> board_init_f_init_reserve
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|-> icache_enable <em class="hl-comment">// arch/riscv/cpu/c906/cache.c</em>
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|-> dcache_enable <em class="hl-comment">// arch/riscv/cpu/c906/cache.c</em>
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|-> board_init_f</pre></div>
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</section><section class="- topic/section section" id="_1601_0__section_yrv_lbd_ndc" data-ofbid="_1601_0__section_yrv_lbd_ndc"><h2 class="- topic/title title sectiontitle">内存分配</h2>
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<div class="- topic/p p" data-ofbid="d297673e175__20250121171803">启动阶段的内存空间是通过预分配的形式进行使用。<ul class="- topic/ul ul" id="_1601_0__ul_hxg_pbd_ndc" data-ofbid="_1601_0__ul_hxg_pbd_ndc"><li class="- topic/li li" data-ofbid="d297673e178__20250121171803">
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<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">BROM 阶段</strong><div class="table-container"><table class="- topic/table table frame-all" id="_1601_0__id2" data-ofbid="_1601_0__id2" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 2</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">BROM 的内存分配</span></caption><colgroup><col style="width:33.33333333333333%"/><col style="width:33.33333333333333%"/><col style="width:33.33333333333333%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__id2__entry__1">地址范围</th><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__id2__entry__2">存放内容</th><th class="- topic/entry entry colsep-0 rowsep-1" id="_1601_0__id2__entry__3">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id2__entry__1">0x00100000 ~ 0x00102000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id2__entry__2">BROM DATA, BSS</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id2__entry__3">8 KB</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id2__entry__1">0x00102000 ~ 0x00103000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id2__entry__2">BROM Stack</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id2__entry__3">4 KB</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__id2__entry__1">0x00103000 ~ 0x00118000</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__id2__entry__2">SPL, PBP</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="_1601_0__id2__entry__3">84 KB</td></tr></tbody></table></div></div>
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</li><li class="- topic/li li" data-ofbid="d297673e221__20250121171803">
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<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">SPL 阶段</strong></div>
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<div class="table-container"><table class="- topic/table table frame-all" id="_1601_0__id3" data-ofbid="_1601_0__id3" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 3</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">SPL 的内存分配</span></caption><colgroup><col style="width:26.331811263318112%"/><col style="width:15.220700152207002%"/><col style="width:58.44748858447488%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__id3__entry__1">地址范围</th><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__id3__entry__2">存放内容</th><th class="- topic/entry entry colsep-0 rowsep-1" id="_1601_0__id3__entry__3">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x00103000 ~ 0x00115F00</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">SPL 初始栈空间</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">0x00118000 是配置的栈顶位置，但实际运行时需要预留 HEAP 空间和 GD
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全局变量的空间，因此实际的栈顶地址是 0x00115F00。<p class="- topic/p p" data-ofbid="d297673e250__20250121171803">配置：CONFIG_SPL_STACK,
|
||
rch/riscv/cpu/start.S</p><p class="- topic/p p" data-ofbid="d297673e252__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">include/configs/d211.h</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x00115F00 ~ 0x00116000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">Global Data</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">GD 全局变量的初始空间</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x00116000 ~ 0x00118000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">HEAP</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">初始 HEAP
|
||
的空间<p class="- topic/p p" data-ofbid="d297673e270__20250121171803">配置：CONFIG_SYS_MALLOC_F_LEN</p><p class="- topic/p p" data-ofbid="d297673e272__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">Kconfig</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x40000000 ~ 0x42000000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">Kernel</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">SPL 直接启动 Kernel 时使用，从 U-Boot
|
||
启动时不用<p class="- topic/p p" data-ofbid="d297673e283__20250121171803">配置：its</p><p class="- topic/p p" data-ofbid="d297673e285__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">kernel.its</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x40004000 ~ 0x41000000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">U-Boot</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">SPL 启动 U-Boot 时使用，直接启动 Kernel 时不用，预留约
|
||
16MB<p class="- topic/p p" data-ofbid="d297673e296__20250121171803">配置：its</p><p class="- topic/p p" data-ofbid="d297673e298__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">u-boot.its</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x42000000 ~ 0x42000100</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">SPL AIC 信息头</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">SPL 的 AIC 头信息</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x42000100 ~ 0x42020000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">SPL bin</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">0x42000100 是 SPL 的程序入口地址，SPL 大小不应该超过
|
||
128KB<p class="- topic/p p" data-ofbid="d297673e316__20250121171803">配置：CONFIG_SPL_TEXT_BASE,
|
||
image_cfg.json</p><p class="- topic/p p" data-ofbid="d297673e318__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">common/spl/Kconfig</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x42200000 ~ 0x42300000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">SPL STACK</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">1MB, 初始栈太小，在 board_r
|
||
之后切换到新的栈运行配置：CONFIG_SPL_STACK_R_ADDR -
|
||
CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN 预留完 Simple heap
|
||
之后，剩下的空间给 Stack 位置：<span class="+ topic/ph sw-d/filepath ph filepath">Kconfig</span></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x42300000 ~ 0x43F00000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">SPL heap</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">28MB 在 SPL board_r 初始化 CONFIG_SYS_SPL_MALLOC_START
|
||
之前使用 D211 不会定义 CONFIG_SYS_SPL_MALLOC_START，只用 Simple
|
||
Heap<p class="- topic/p p" data-ofbid="d297673e338__20250121171803">配置：CONFIG_SPL_STACK_R_ADDR
|
||
=0x43F00000</p><p class="- topic/p p" data-ofbid="d297673e340__20250121171803">配置：CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN
|
||
=
|
||
0x1C000000,28MB</p><p class="- topic/p p" data-ofbid="d297673e342__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">Kconfig</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__1">0x43F00000 ~ 0x43F20000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id3__entry__2">Falcon 模式参数</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id3__entry__3">SPL Falcon
|
||
模式才需要，所需空间不大<p class="- topic/p p" data-ofbid="d297673e353__20250121171803">配置：CONFIG_SYS_SPL_ARGS_ADDR</p><p class="- topic/p p" data-ofbid="d297673e355__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">include/configs/d211.h</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__id3__entry__1">0x43FE0000 ~ 0x44000000</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__id3__entry__2">OpenSBI</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="_1601_0__id3__entry__3">配置：CONFIG_SPL_OPENSBI_LOAD_ADDR<p class="- topic/p p" data-ofbid="d297673e366__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">Kconfig</span></p></td></tr></tbody></table></div>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="_1601_0__id4" data-ofbid="_1601_0__id4" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 4</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">USB 升级时下载地址</span></caption><colgroup><col style="width:26.32450331125828%"/><col style="width:16.55629139072848%"/><col style="width:57.11920529801324%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__id4__entry__1">地址范围</th><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__id4__entry__2">存放内容</th><th class="- topic/entry entry colsep-0 rowsep-1" id="_1601_0__id4__entry__3">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id4__entry__1">0x40000000 ~ 0x41000000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id4__entry__2">SPL</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id4__entry__3">SPL
|
||
的下载地址，运行起来时会被搬运到指定的链接位置<p class="- topic/p p" data-ofbid="d297673e394__20250121171803">配置：<span class="+ topic/ph sw-d/filepath ph filepath">image_cfg.json</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id4__entry__1">0x41000000 ~ 0x41100000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id4__entry__2">env.bin</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id4__entry__3">存放启动升级程序（U-Boot）所用的环境变量，由于升级时不会直接运行 Kernel，因此与上面的
|
||
Kernel 地址空间不冲突<p class="- topic/p p" data-ofbid="d297673e405__20250121171803">配置：CONFIG_ENV_RAM_ADDR,
|
||
image_cfg.json</p><p class="- topic/p p" data-ofbid="d297673e407__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">env/Kconfig</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__id4__entry__1">0x41100000 ~ 0x42000000</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__id4__entry__2">uboot.itb</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="_1601_0__id4__entry__3">存放升级程序<p class="- topic/p p" data-ofbid="d297673e418__20250121171803">配置：CONFIG_SPL_LOAD_FIT_ADDRESS,
|
||
image_cfg.json</p><p class="- topic/p p" data-ofbid="d297673e420__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">Kconfig</span></p></td></tr></tbody></table></div>
|
||
</li><li class="- topic/li li" data-ofbid="d297673e425__20250121171803">
|
||
<div class="- topic/p p" data-ofbid="d297673e427__20250121171803"><strong class="+ topic/ph hi-d/b ph b">U-Boot 阶段</strong><div class="table-container"><table class="- topic/table table frame-all" id="_1601_0__id5" data-ofbid="_1601_0__id5" data-cols="3"><caption></caption><colgroup><col style="width:23.772102161100197%"/><col style="width:19.64636542239686%"/><col style="width:56.581532416502945%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__id5__entry__1">地址范围</th><th class="- topic/entry entry colsep-1 rowsep-1" id="_1601_0__id5__entry__2">存放内容</th><th class="- topic/entry entry colsep-0 rowsep-1" id="_1601_0__id5__entry__3">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">0x40004000 ~ 0x41000000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">初始 U-Boot</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">U-Boot 的程序入口地址，但在初始化完成之后，U-Boot 会自行重定位到 DRAM
|
||
的末尾运行，该空间被空出来，用于加载
|
||
Kernel<p class="- topic/p p" data-ofbid="d297673e451__20250121171803">配置：CONFIG_SYS_TEXT_BASE</p><p class="- topic/p p" data-ofbid="d297673e453__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">Kconfig</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">0x40300000 ~ 0x40400000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">初始 U-Boot HEAP</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">初始 gd, HEAP, STACK
|
||
的保留空间，重定位之后，该空间会被空出来。配置：CONFIG_SYS_INIT_SP_ADDR
|
||
位置：<span class="+ topic/ph sw-d/filepath ph filepath">include/configs/d211.h</span><p class="- topic/p p" data-ofbid="d297673e466__20250121171803">配置：CONFIG_SYS_MALLOC_F_LEN</p><p class="- topic/p p" data-ofbid="d297673e468__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">Kconfig</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">0x40000000 ~ 0x42000000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">Kernel</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">Kernel 的程序入口地址，Kernel 最终会被加载到该空间</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">0x41200000 ~ 0x42200000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">kenrel.itb</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">Kernel.itb 的加载地址，加载后 Kernel 被复制到 0x40000000 预留 16
|
||
MB<p class="- topic/p p" data-ofbid="d297673e486__20250121171803">配置：knl_addr</p><p class="- topic/p p" data-ofbid="d297673e488__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">env.txt</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">0x42200000 ~ 0x42300000</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">dtb</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">调试用，正常情况下不使用<ul class="- topic/ul ul" id="_1601_0__ul_qkc_vp3_bcc" data-ofbid="_1601_0__ul_qkc_vp3_bcc"><li class="- topic/li li" data-ofbid="d297673e500__20250121171803">配置：dtb_addr </li><li class="- topic/li li" data-ofbid="d297673e502__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">env.txt</span></li></ul></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">0x42400000 ~ ……….</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">logo.itb</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">Logo 数据的加载地址，logo.itb 中存储了多张 png 图片 uboot
|
||
会从该地址读取相应的 png 图片进行解码并显示<p class="- topic/p p" data-ofbid="d297673e513__20250121171803">配置：<span class="+ topic/ph sw-d/filepath ph filepath">logo: { ram:
|
||
}</span></p><p class="- topic/p p" data-ofbid="d297673e517__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">image_cfg.json</span></p><p class="- topic/p p" data-ofbid="d297673e521__20250121171803">配置：CONFIG_LOGO_ITB_ADDRESS</p><p class="- topic/p p" data-ofbid="d297673e523__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">drivers/video/artinchip/display/aic_display.c</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">0x41000000 ~ ……….</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">ENV</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">U-Boot 环境变量的加载地址，USB 升级时使用，16KB 左右初始化加载之后可释放，不影响
|
||
Kernel
|
||
的使用<p class="- topic/p p" data-ofbid="d297673e534__20250121171803">配置：CONFIG_ENV_RAM_ADDR</p><p class="- topic/p p" data-ofbid="d297673e536__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">env/Kconfig</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">At the End of DRAM</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">保留内存</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">重定位后的 U-Boot、栈、堆，以及其他需要预留的内存。具体可以查看 board_f.c
|
||
相关处理。</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__1">0x43F00000 ~ 0x43FDFFFF</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="_1601_0__id5__entry__2">dtb</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="_1601_0__id5__entry__3">预留给 Kernel dtb 的内存空间，正常启动时加载到该空间<p class="- topic/p p" data-ofbid="d297673e554__20250121171803">配置：fdt-1: {
|
||
load =
|
||
}</p><p class="- topic/p p" data-ofbid="d297673e556__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">kernel.its</span></p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__id5__entry__1">0x43FE0000 ~ 0x44000000</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="_1601_0__id5__entry__2">OpenSBI</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="_1601_0__id5__entry__3">预留给 OpenSBI
|
||
的内存空间<p class="- topic/p p" data-ofbid="d297673e567__20250121171803">配置：CONFIG_SPL_OPENSBI_LOAD_ADDR</p><p class="- topic/p p" data-ofbid="d297673e569__20250121171803">位置：<span class="+ topic/ph sw-d/filepath ph filepath">Kconfig</span></p></td></tr></tbody></table></div></div>
|
||
</li></ul></div>
|
||
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#_1601_0__section_bws_cbd_ndc" data-tocid="_1601_0__section_bws_cbd_ndc">DDR 初始化</a></div></li><li class="section-item"><div class="section-title"><a href="#_1601_0__section_sz5_2bd_ndc" data-tocid="_1601_0__section_sz5_2bd_ndc">Cache</a></div></li><li class="section-item"><div class="section-title"><a href="#_1601_0__section_yrv_lbd_ndc" data-tocid="_1601_0__section_yrv_lbd_ndc">内存分配</a></div></li></ul></div>
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