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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/uboot-pass-param-1601.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">启动参数的传递</h1><div class="date inPage">4 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"><div class="- topic/p p" data-ofbid="d73903e23__20250121171523">启动过程中，不同的启动流程会用到不同启动参数，用于将当前一级程序的信息传递给下一级程序， 辅助下一级程序的执行，详情如下：<ul class="- topic/ul ul" id="concept_f42_tsl_tzb__ul_ynf_xtl_tzb" data-ofbid="concept_f42_tsl_tzb__ul_ynf_xtl_tzb"><li class="- topic/li li" data-ofbid="d73903e26__20250121171523"><a class="- topic/xref xref" href="#concept_f42_tsl_tzb__id6">BROM 跳转到 SPL 或者 U-Boot 时传递的参数</a></li><li class="- topic/li li" data-ofbid="d73903e30__20250121171523"><a class="- topic/xref xref" href="#concept_f42_tsl_tzb__id7">BROM RISCV 跳转到 SPL 或者 U-Boot 时传递的参数</a></li><li class="- topic/li li" data-ofbid="d73903e34__20250121171523"><a class="- topic/xref xref" href="#concept_f42_tsl_tzb__id8">SPL 跳转 U-Boot 时传递的参数</a></li><li class="- topic/li li" data-ofbid="d73903e38__20250121171523"><a class="- topic/xref xref" href="#concept_f42_tsl_tzb__p_k4t_ztl_tzb">SPL 和 U-Boot 跳转到内核时传递的参数</a></li></ul></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_f42_tsl_tzb__id6" data-ofbid="concept_f42_tsl_tzb__id6" 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">BROM 跳转到 SPL 或者 U-Boot 时传递的参数</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-0 rowsep-0" id="concept_f42_tsl_tzb__id6__entry__1">参数名称</th><th class="- topic/entry entry colsep-0 rowsep-0" id="concept_f42_tsl_tzb__id6__entry__2">寄存器</th><th class="- topic/entry entry colsep-0 rowsep-0" id="concept_f42_tsl_tzb__id6__entry__3">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__1">boot device</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__2">R0,bit[3:0]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__3">启动的存储介质 ID</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__1">boot reason</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__2">R0,bit[7:4]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__3">启动的原因，如：冷启动、热启动</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__1">image id</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__2">R0,bit[11:8]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__3">使用的备份镜像 ID</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__1">boot time</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__2">R1</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id6__entry__3">BROM 启动所使用的时间(us)</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_f42_tsl_tzb__id7" data-ofbid="concept_f42_tsl_tzb__id7" 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 RISCV 跳转到 SPL 或者 U-Boot 时传递的参数</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-0 rowsep-0" id="concept_f42_tsl_tzb__id7__entry__1">参数名称</th><th class="- topic/entry entry colsep-0 rowsep-0" id="concept_f42_tsl_tzb__id7__entry__2">寄存器</th><th class="- topic/entry entry colsep-0 rowsep-0" id="concept_f42_tsl_tzb__id7__entry__3">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__1">boot device</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__2">a0,bit[3:0]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__3">启动的存储介质 ID</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__1">boot reason</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__2">a0,bit[7:4]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__3">启动的原因，如：冷启动、热启动</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__1">image id</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__2">a0,bit[11:8]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__3">使用的备份镜像 ID</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__1">boot time</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__2">a1</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id7__entry__3">BROM 启动所使用的时间(us)</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_f42_tsl_tzb__id8" data-ofbid="concept_f42_tsl_tzb__id8" 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 跳转 U-Boot 时传递的参数</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-0 rowsep-0" id="concept_f42_tsl_tzb__id8__entry__1">参数名称</th><th class="- topic/entry entry colsep-0 rowsep-0" id="concept_f42_tsl_tzb__id8__entry__2">寄存器</th><th class="- topic/entry entry colsep-0 rowsep-0" id="concept_f42_tsl_tzb__id8__entry__3">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__1">boot device</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__2">R0,bit[3:0]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__3">启动的存储介质 ID，BROM 传递过来的值</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__1">boot reason</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__2">R0,bit[7:4]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__3">启动的原因，BROM 传递过来的值</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__1">image id</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__2">R0,bit[11:8]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__3">暂时没有使用</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__1">boot time</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__2">R1</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_f42_tsl_tzb__id8__entry__3">SPL 启动所使用的时间(us)</td></tr></tbody></table></div><div class="- topic/p p" id="concept_f42_tsl_tzb__p_k4t_ztl_tzb" data-ofbid="concept_f42_tsl_tzb__p_k4t_ztl_tzb">SPL 和 U-Boot 跳转到内核时传递的参数相同，分别是：<ul class="- topic/ul ul" id="concept_f42_tsl_tzb__ul_jpc_wyg_bzb" data-ofbid="concept_f42_tsl_tzb__ul_jpc_wyg_bzb"><li class="- topic/li li" data-ofbid="d73903e177__20250121171523">
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<p class="- topic/p p" data-ofbid="d73903e179__20250121171523">R0: zero</p>
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</li><li class="- topic/li li" data-ofbid="d73903e182__20250121171523">
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<p class="- topic/p p" data-ofbid="d73903e184__20250121171523">R1: mach id</p>
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</li><li class="- topic/li li" data-ofbid="d73903e187__20250121171523">
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<p class="- topic/p p" data-ofbid="d73903e189__20250121171523">R2: FDT address</p>
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</li></ul></div><p class="- topic/p p" data-ofbid="d73903e192__20250121171523">无论是 SPL 还是 U-Boot，在执行时的第一步动作就是保存这些启动参数， 具体实现可参考
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<span class="+ topic/ph sw-d/filepath ph filepath">arch/arm/cpu/armv7/start.S</span></p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_f42_tsl_tzb__codeblock_bpc_wyg_bzb" data-ofbid="concept_f42_tsl_tzb__codeblock_bpc_wyg_bzb">reset:
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<em class="hl-comment">/* Allow the board to save important registers */</em>
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b save_boot_params
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save_boot_params_ret:</pre><p class="- topic/p p" data-ofbid="d73903e198__20250121171523"><span class="+ topic/keyword pr-d/parmname keyword parmname">save_boot_params</span> 的实现在源文件
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<span class="+ topic/ph sw-d/filepath ph filepath">arch/arm/mach-artinchip/lowlevel_init.S</span></p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_f42_tsl_tzb__codeblock_cpc_wyg_bzb" data-ofbid="concept_f42_tsl_tzb__codeblock_cpc_wyg_bzb">ENTRY(save_boot_params)
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stmfd sp!, {r4} <em class="hl-comment">/* Backup r4 on caller's stack */</em>
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ldr r4, =boot_params_stash
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stmia r4!, {r0 - r3} <em class="hl-comment">/* Save r0 ~ r3 to boot_params_stash */</em>
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mov r0, r4
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ldmfd sp!, {r4} <em class="hl-comment">/* Restore r4 */</em>
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stmia r0!, {r4 - r13, lr} <em class="hl-comment">/* Save r4 ~ r14 to boot_params_stash */</em>
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b save_boot_params_ret
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ENDPROC(save_boot_params)</pre><p class="- topic/p p" data-ofbid="d73903e206__20250121171523">传递的参数被保存在全局变量 <span class="+ topic/keyword pr-d/parmname keyword parmname">boot_params_stash</span> 中，SPL 或者 U-Boot 可从中获取相关信息。 在保存参数时，不仅将
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R0,R1 寄存器保存起来，还将其他重要寄存器一起保存。 原因是这里不仅要传递参数，还为了实现 SPL 返回 BROM 的功能。将其他寄存器一起保存，
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相当于保存了调用现场，需要返回时可以 <span class="+ topic/keyword pr-d/parmname keyword parmname">boot_params_stash</span> 中恢复相应的寄存器参数。</p><p class="- topic/p p" data-ofbid="d73903e214__20250121171523">无论是 SPL 还是 U-Boot，在执行时的第一步动作就是保存这些启动参数， 具体实现可参考
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<span class="+ topic/ph sw-d/filepath ph filepath">arch\riscv\cpu\start.S</span></p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_f42_tsl_tzb__codeblock_epc_wyg_bzb" data-ofbid="concept_f42_tsl_tzb__codeblock_epc_wyg_bzb">_start:
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<em class="hl-comment">/* Allow the board to save important registers */</em>
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j save_boot_params
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save_boot_params_ret:</pre><p class="- topic/p p" data-ofbid="d73903e221__20250121171523"><span class="+ topic/keyword pr-d/parmname keyword parmname">save_boot_params</span> 的实现在源文件
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<span class="+ topic/ph sw-d/filepath ph filepath">arch\riscv\mach-artinchip\lowlevel_init.S</span></p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_f42_tsl_tzb__codeblock_fpc_wyg_bzb" data-ofbid="concept_f42_tsl_tzb__codeblock_fpc_wyg_bzb">ENTRY(save_boot_params)
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la t0, boot_params_stash
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SREG a0, REGBYTES * <span class="hl-number">0</span>(t0)
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SREG a1, REGBYTES * <span class="hl-number">1</span>(t0)
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SREG a2, REGBYTES * <span class="hl-number">2</span>(t0)
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SREG a3, REGBYTES * <span class="hl-number">3</span>(t0)
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SREG a4, REGBYTES * <span class="hl-number">4</span>(t0)
|
||
SREG a5, REGBYTES * <span class="hl-number">5</span>(t0)
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||
SREG a6, REGBYTES * <span class="hl-number">6</span>(t0)
|
||
SREG a7, REGBYTES * <span class="hl-number">7</span>(t0)
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||
SREG s0, REGBYTES * <span class="hl-number">8</span>(t0)
|
||
SREG s1, REGBYTES * <span class="hl-number">9</span>(t0)
|
||
SREG s2, REGBYTES * <span class="hl-number">10</span>(t0)
|
||
SREG s3, REGBYTES * <span class="hl-number">11</span>(t0)
|
||
SREG s4, REGBYTES * <span class="hl-number">12</span>(t0)
|
||
SREG s5, REGBYTES * <span class="hl-number">13</span>(t0)
|
||
SREG s6, REGBYTES * <span class="hl-number">14</span>(t0)
|
||
SREG s7, REGBYTES * <span class="hl-number">15</span>(t0)
|
||
SREG s8, REGBYTES * <span class="hl-number">16</span>(t0)
|
||
SREG s9, REGBYTES * <span class="hl-number">17</span>(t0)
|
||
SREG s10, REGBYTES * <span class="hl-number">18</span>(t0)
|
||
SREG s11, REGBYTES * <span class="hl-number">19</span>(t0)
|
||
SREG sp, REGBYTES * <span class="hl-number">20</span>(t0)
|
||
SREG ra, REGBYTES * <span class="hl-number">21</span>(t0)
|
||
j save_boot_params_ret
|
||
ENDPROC(save_boot_params)</pre><p class="- topic/p p" data-ofbid="d73903e229__20250121171523">传递的参数被保存在全局变量 <span class="+ topic/keyword pr-d/parmname keyword parmname">boot_params_stash</span> 中，SPL 或者 U-Boot 可从中获取相关信息。具体用法参考上一节。</p><p class="- topic/p p" data-ofbid="d73903e234__20250121171523">相关宏定义的实现在源文件 <span class="+ topic/ph sw-d/filepath ph filepath">arch\riscv\cpu\mtrap.S</span></p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="concept_f42_tsl_tzb__codeblock_gpc_wyg_bzb" data-ofbid="concept_f42_tsl_tzb__codeblock_gpc_wyg_bzb">#<span class="hl-directive">define</span> LREG ld
|
||
#<span class="hl-directive">define</span> SREG sd
|
||
#<span class="hl-directive">define</span> REGBYTES <span class="hl-number">8</span></pre></div></article></main></div>
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