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role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e2022" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e2022-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/bringup/chapter-bringup.html" id="id-d3752e2022-link">BringUp</a><div class="wh-tooltip"><p class="shortdesc">主要描述板卡的各项配置，使 SDK 的环境和板卡匹配，并确保 SDK 编译后的固件能够在板子上正常运行。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e2418" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e2418-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/chapter-advanced-app.html" id="id-d3752e2418-link">高级应用</a><div class="wh-tooltip"><p class="shortdesc">系统、存储、多媒体、接口、安全等模块的详细配置和设计说明。</p></div></div></div></li></ul></div>
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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" role="article" aria-labelledby="ariaid-title1">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://aicdocco/taskstopics/sdk/xip/4_adapter_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">适配说明</h1>
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<div class="date inPage">16 May 2025</div><div style="color: gray;">
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Read time: 7 minute(s)
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</div>
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<div class="- topic/body body">
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<p class="- topic/p p" data-ofbid="d68043e30__20250519091510">本节介绍 <span class="- topic/ph ph">Luban-Lite</span> 方案中 XIP（Execute In Place）启动的适配说明。</p>
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<p class="- topic/p p" data-ofbid="d68043e36__20250519091510">不同的处理器和平台可能有不同的实现细节和要求。因此，在进行 XIP 适配时，务必参考特定处理器的技术文档和相关资源。</p>
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<section class="- topic/section section" id="id__id2" data-ofbid="id__id2"><h2 class="- topic/title title sectiontitle">可执行文件</h2>
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<ul class="- topic/ul ul simple" data-ofbid="d68043e43__20250519091510">
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<li class="- topic/li li" data-ofbid="d68043e45__20250519091510">
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<p class="- topic/p p" data-ofbid="d68043e47__20250519091510"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv_bare/spinor/aic_flash_xip_def.c</span>：关于 NOR
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Flash 的 XIP 配置信息</p>
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</li>
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<li class="- topic/li li" data-ofbid="d68043e53__20250519091510">
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<p class="- topic/p p" data-ofbid="d68043e55__20250519091510"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/include/drv_bare/aic_flash_xip_def.h</span>：关于
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<span class="+ topic/keyword pr-d/apiname keyword apiname">aic_flash_xip_def </span>相关结构体和接口声明</p>
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</li>
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<li class="- topic/li li" data-ofbid="d68043e64__20250519091510">
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<p class="- topic/p p" data-ofbid="d68043e66__20250519091510"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/include/hal/hal_qspi.h</span>：关于 QSPI
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控制器相关接口头文件</p>
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</li>
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</ul>
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</section>
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<section class="- topic/section section" id="id__id3" data-ofbid="id__id3"><h2 class="- topic/title title sectiontitle">配置结构体定义</h2>
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<p class="- topic/p p" data-ofbid="d68043e78__20250519091510">XIP 相关的 NOR Flash 信息配置
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv_bare/spinor/aic_flash_xip_def.c</span> 文件中。</p><p class="- topic/p p" data-ofbid="d68043e83__20250519091510">以下是 SPI NOR Flash 设备的配置结构体定义，主要包括以下几个部分：</p><div class="- topic/p p" data-ofbid="d68043e85__20250519091510">
|
||
<ul class="- topic/ul ul" id="id__ol_s2y_ypn_vcc" data-ofbid="id__ol_s2y_ypn_vcc">
|
||
<li class="- topic/li li" data-ofbid="d68043e89__20250519091510">
|
||
<div class="- topic/p p" data-ofbid="d68043e91__20250519091510"><code class="+ topic/ph pr-d/codeph ph codeph">xip_device</code> 结构体：包含设备名称、Flash
|
||
ID、支持的协议等信息，以及两个配置结构体（<code class="+ topic/ph pr-d/codeph ph codeph">qspi_xip_burst_cfg</code> 和
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">qspi_xip_read_cfg</code>）。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_r54_zpn_vcc" data-ofbid="id__codeblock_r54_zpn_vcc"><strong class="hl-keyword">struct</strong> xip_device {
|
||
<strong class="hl-keyword">const</strong> <strong class="hl-keyword">char</strong> *name;
|
||
u32 flash_id;
|
||
u32 proto_support;
|
||
<strong class="hl-keyword">struct</strong> qspi_xip_burst_cfg burst_cfg;
|
||
<strong class="hl-keyword">struct</strong> qspi_xip_read_cfg read_cfg;
|
||
};</pre></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e105__20250519091510"><code class="+ topic/ph pr-d/codeph ph codeph">qspi_xip_burst_cfg</code> 结构体：用于配置 QSPI XIP
|
||
模式下的突发传输参数，包括设置突发命令、虚拟字节、位宽等。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_xjc_cqn_vcc" data-ofbid="id__codeblock_xjc_cqn_vcc"><strong class="hl-keyword">struct</strong> qspi_xip_burst_cfg {
|
||
u8 cmd_set_burst; <em class="hl-comment">/* CMD to set burst with wrap or linear, 77h or C0h */</em>
|
||
u8 cmd_dummy_byte; <em class="hl-comment">/* Dummy byte fot set burst command */</em>
|
||
u8 cmd_bits_width; <em class="hl-comment">/* When CMD is C0h, bits width is needed to set */</em>
|
||
u8 wrap_en; <em class="hl-comment">/* 00: disable, 01 wrap with fixed len, 02 wrap with auto len */</em>
|
||
<strong class="hl-keyword">struct</strong> qspi_xip_wrap_bits wrap;
|
||
};</pre></li>
|
||
<li class="- topic/li li" data-ofbid="d68043e112__20250519091510"><code class="+ topic/ph pr-d/codeph ph codeph">qspi_xip_wrap_bits</code> 结构体：用于配置 QSPI XIP
|
||
模式下的包装位参数，包括固定长度、禁用包装、自动选择不同长度的包装位。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_f3v_dqn_vcc" data-ofbid="id__codeblock_f3v_dqn_vcc"><strong class="hl-keyword">struct</strong> qspi_xip_wrap_bits {
|
||
<em class="hl-comment">/*
|
||
* When config SPI controller select to use fixed wrap length, should
|
||
* set the selected wrap bits value to it.
|
||
*/</em>
|
||
u8 fixed_len;
|
||
<em class="hl-comment">/*
|
||
* Wrap bits value to disable wrap length
|
||
*/</em>
|
||
u8 disable;
|
||
<em class="hl-comment">/*
|
||
* Wrap bits value to select wrap length 64bytes
|
||
*/</em>
|
||
u8 auto_wl64;
|
||
<em class="hl-comment">/*
|
||
* Wrap bits value to select wrap length 32bytes
|
||
*/</em>
|
||
u8 auto_wl32;
|
||
<em class="hl-comment">/*
|
||
* Wrap bits value to select wrap length 16bytes
|
||
*/</em>
|
||
u8 auto_wl16;
|
||
<em class="hl-comment">/*
|
||
* Wrap bits value to select wrap length 8bytes
|
||
*/</em>
|
||
u8 auto_wl8;
|
||
};</pre></li>
|
||
<li class="- topic/li li" data-ofbid="d68043e119__20250519091510"><code class="+ topic/ph pr-d/codeph ph codeph">qspi_xip_read_cfg</code> 结构体：用于配置 QSPI XIP
|
||
模式下的读取参数，包括读取命令、虚拟字节、地址模式等。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_ffh_gqn_vcc" data-ofbid="id__codeblock_ffh_gqn_vcc"><strong class="hl-keyword">struct</strong> qspi_xip_read_cfg {
|
||
<em class="hl-comment">/*
|
||
* QIO or QPI read command value
|
||
*/</em>
|
||
u8 read_cmd;
|
||
<em class="hl-comment">/*
|
||
* Read command's dummy byte.
|
||
* User should check SPI NOR datasheet and set it.
|
||
*/</em>
|
||
u8 dummy_byte;
|
||
u8 addr_mode; <em class="hl-comment">/* 0: 3byte address, 1: 4byte address */</em>
|
||
<em class="hl-comment">/*
|
||
* When CPU cache is disabled, user can select to enable read command bypass mode
|
||
*/</em>
|
||
u8 read_cmd_bypass_en;
|
||
<strong class="hl-keyword">struct</strong> qspi_xip_read_cmd_mode_byte mode;
|
||
};</pre></li>
|
||
<li class="- topic/li li" data-ofbid="d68043e126__20250519091510"><code class="+ topic/ph pr-d/codeph ph codeph">qspi_xip_read_cmd_mode_byte</code> 结构体：用于配置 QSPI XIP
|
||
模式下的读取命令模式字节，包括正常模式和绕过模式。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_ntl_gqn_vcc" data-ofbid="id__codeblock_ntl_gqn_vcc"><strong class="hl-keyword">struct</strong> qspi_xip_read_cmd_mode_byte {
|
||
<em class="hl-comment">/*
|
||
* Mode byte code value to set read command bypass mode,
|
||
* User should check SPI NOR datasheet and set it.
|
||
*/</em>
|
||
u8 bypass;
|
||
<em class="hl-comment">/*
|
||
* Mode byte code value to set read command normal mode,
|
||
* User should check SPI NOR datasheet and set it.
|
||
*/</em>
|
||
u8 normal;
|
||
};</pre></li>
|
||
</ul>
|
||
</div>
|
||
|
||
</section>
|
||
<section class="- topic/section section" id="id__id4" data-ofbid="id__id4"><h2 class="- topic/title title sectiontitle">适配方法</h2>
|
||
<p class="- topic/p p" data-ofbid="d68043e140__20250519091510">在 <span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv_bare/spinor/aic_flash_xip_def.c</span> 文件中添加节点信息到
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">struct xip_device</code> 结构体中。每个节点代表一颗 NOR Flash 。</p>
|
||
<div class="- topic/p p" data-ofbid="d68043e149__20250519091510">以下以 <strong class="+ topic/ph hi-d/b ph b">ZB25VQ128</strong> 为例演示具体的适配流程：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_unr_kpq_gdc" data-ofbid="id__codeblock_unr_kpq_gdc">{
|
||
.name = <span class="hl-string">"ZB25VQ128"</span>, <em class="hl-comment">// verify ok.</em>
|
||
.flash_id = <span class="hl-number">0X5E4018</span>,
|
||
.proto_support = CMD_PROTO_QIO|CMD_PROTO_CACHE_EN|CMD_PROTO_CACHE_DIS,
|
||
.burst_cfg = {
|
||
.cmd_set_burst = <span class="hl-number">0x77</span>,
|
||
.cmd_dummy_byte = <span class="hl-number">3</span>,
|
||
.cmd_bits_width = XIP_C0_BITS_WIDTH_<span class="hl-number">4</span>,
|
||
.wrap_en = XIP_BURST_WRAPPED_WITH_FIXED_LEN,
|
||
.wrap = {
|
||
.fixed_len = <span class="hl-number">0x40</span>,
|
||
.disable = <span class="hl-number">0x10</span>,
|
||
.auto_wl64 = <span class="hl-number">0x60</span>,
|
||
.auto_wl32 = <span class="hl-number">0x40</span>,
|
||
.auto_wl16 = <span class="hl-number">0x20</span>,
|
||
.auto_wl8 = <span class="hl-number">0x00</span>,
|
||
},
|
||
},
|
||
.read_cfg = {
|
||
.read_cmd = <span class="hl-number">0xEB</span>,
|
||
.dummy_byte = <span class="hl-number">2</span>,
|
||
.addr_mode = SPINOR_ADDR_MODE_<span class="hl-number">3</span>BYTE,
|
||
.read_cmd_bypass_en = <span class="hl-number">0</span>,
|
||
.mode = {
|
||
.bypass = <span class="hl-number">0xf0</span>,
|
||
.normal = <span class="hl-number">0x00</span>,
|
||
},
|
||
},
|
||
}, <em class="hl-comment">//.name = "ZB25VQ128",</em></pre></div>
|
||
<ul class="- topic/ul ul" id="id__ul_t32_lpq_gdc" data-ofbid="id__ul_t32_lpq_gdc">
|
||
<li class="- topic/li li" data-ofbid="d68043e159__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e161__20250519091510"><code class="+ topic/ph pr-d/codeph ph codeph">.flash_id</code> = 0X5E4018：</p>
|
||
<p class="- topic/p p" data-ofbid="d68043e166__20250519091510">一般情况下，可通过 SPI 模式读取设备 ID，根据手册说明，ZB25VQ128 ID 为 0x5E4018。</p>
|
||
<figure class="- topic/fig fig fignone" id="id__id9" data-ofbid="id__id9">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_j3l_lpq_gdc" src="../../../images/xip/flash_id.png" alt="flash_id"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Flash ID</span></figcaption></figure>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e182__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e184__20250519091510"><span class="+ topic/ph sw-d/filepath ph filepath">.burst_cfg</span>：</p>
|
||
<p class="- topic/p p" data-ofbid="d68043e189__20250519091510"><code class="+ topic/ph pr-d/codeph ph codeph">struct qspi_xip_burst_cfg</code> 需要填充 Set Burst with Wrap
|
||
指令配置，根据手册可知，<code class="+ topic/ph pr-d/codeph ph codeph">.cmd_set_burst =
|
||
0x77</code>，<code class="+ topic/ph pr-d/codeph ph codeph">.wrap_en
|
||
= XIP_BURST_WRAPPED_WITH_FIXED_LEN</code> 使能即使用 <code class="+ topic/ph pr-d/codeph ph codeph">struct
|
||
qspi_xip_wrap_bits</code> 的 <code class="+ topic/ph pr-d/codeph ph codeph">.fixed_len</code> 配置其中
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">.fixed_len = 0x40</code> 意为 bit6 = 1， bit5=0 , 即
|
||
0x40.</p>
|
||
<div class="- topic/p p" data-ofbid="d68043e212__20250519091510">注意 <code class="+ topic/ph pr-d/codeph ph codeph">.cmd_dummy_byte</code> 是以 Byte 为单位，手册中描述需要 24 Dummy Bits，即 3
|
||
Bytes。<figure class="- topic/fig fig fignone" id="id__id10" data-ofbid="id__id10">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_vyd_mpq_gdc" src="../../../images/xip/burst_cfg.png" alt="burst_cfg"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Burst CFG</span></figcaption></figure></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e230__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e232__20250519091510">.read_cfg =：</p>
|
||
<p class="- topic/p p" data-ofbid="d68043e235__20250519091510"><code class="+ topic/ph pr-d/codeph ph codeph">structqspi_xip_read_cfg</code>
|
||
是填充 Fast Read Quad I/O 指令配置，从 Set Burst with Wrap 指令的描述可知， The Set Burst
|
||
with Wrap (77h) command is used in conjunction with ― Fast Read Quad I/O
|
||
commands to access a fixed length and alignment of 8/16/32/64-bytes of
|
||
data.</p>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section class="- topic/section section" id="id__id5" data-ofbid="id__id5"><h2 class="- topic/title title sectiontitle">注意事项</h2>
|
||
<ul class="- topic/ul ul" id="id__ul_eqb_n4y_3dc" data-ofbid="id__ul_eqb_n4y_3dc">
|
||
<li class="- topic/li li" data-ofbid="d68043e252__20250519091510">
|
||
<div class="- topic/div div section" id="id__cache-qio-qpi"><strong class="+ topic/ph hi-d/b ph b">Cache 关闭，QIO/QPI 模式</strong>
|
||
<ul class="- topic/ul ul" id="id__ul_h3c_54y_3dc" data-ofbid="id__ul_h3c_54y_3dc">
|
||
<li class="- topic/li li" data-ofbid="d68043e260__20250519091510">
|
||
<div class="- topic/div div section" id="id__id6"><strong class="+ topic/ph hi-d/b ph b">要点</strong>
|
||
<div class="- topic/p p" data-ofbid="d68043e266__20250519091510">QIO:<ul class="- topic/ul ul" id="id__ul_lpx_mpq_gdc" data-ofbid="id__ul_lpx_mpq_gdc">
|
||
<li class="- topic/li li" data-ofbid="d68043e270__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e272__20250519091510">CPU 只发 Linear 访问</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e276__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e278__20250519091510">Read Command Bypass 可以使能</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e282__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e284__20250519091510">SPINOR 需要使能 QE Bit</p>
|
||
</li>
|
||
</ul></div><div class="- topic/p p" data-ofbid="d68043e288__20250519091510">QPI:<ul class="- topic/ul ul" id="id__ul_uv3_npq_gdc" data-ofbid="id__ul_uv3_npq_gdc">
|
||
<li class="- topic/li li" data-ofbid="d68043e292__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e294__20250519091510">CPU 只发 Linear 访问</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e298__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e300__20250519091510">Read Command Bypass 可以使能</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e304__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e306__20250519091510">SPINOR 需要使能 QE Bit</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e310__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e312__20250519091510">SPINOR 需要进入 QPI 模式</p>
|
||
</li>
|
||
</ul></div>
|
||
</div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e319__20250519091510">
|
||
<div class="- topic/div div section" id="id__cache-enable-wrap"><strong class="+ topic/ph hi-d/b ph b">为什么 Cache
|
||
Enable 时，必须使能 Wrap</strong><p class="- topic/p p" data-ofbid="d68043e324__20250519091510"> CPU Cache 使能时，CPU 发起的访问可能是 Wrap
|
||
burst，如果 SPI 控制器的 Wrap enable 没有使能， 则 SPI 控制器的 XIP 模块不会发送设置
|
||
SPINOR Wrap 模式的命令。 结果会导致 CPU 的访问类型与 SPINOR
|
||
返回数据的方式不匹配，读取数据出错。</p></div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e331__20250519091510">
|
||
<div class="- topic/div div section" id="id__id7"><strong class="+ topic/ph hi-d/b ph b">Cache 使能，QIO/QPI 模式</strong>
|
||
<ul class="- topic/ul ul" id="id__ul_vdv_s4y_3dc" data-ofbid="id__ul_vdv_s4y_3dc">
|
||
<li class="- topic/li li" data-ofbid="d68043e339__20250519091510">
|
||
<div class="- topic/div div section" id="id__id8"><strong class="+ topic/ph hi-d/b ph b">要点</strong>
|
||
<div class="- topic/p p" data-ofbid="d68043e345__20250519091510">QIO:<ul class="- topic/ul ul" id="id__ul_gry_npq_gdc" data-ofbid="id__ul_gry_npq_gdc">
|
||
<li class="- topic/li li" data-ofbid="d68043e349__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e351__20250519091510">SPI 控制器的 Wrap burst 必须使能</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e355__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e357__20250519091510"><strong class="+ topic/ph hi-d/b ph b">Read Command Bypass 不可以使能</strong></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e362__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e364__20250519091510">CPU 可能发 Linear/Wrap burst 访问</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e368__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e370__20250519091510">SPINOR 需要使能 QE Bit</p>
|
||
</li>
|
||
</ul></div><div class="- topic/p p" data-ofbid="d68043e374__20250519091510">QPI:<ul class="- topic/ul ul" id="id__ul_kkj_4pq_gdc" data-ofbid="id__ul_kkj_4pq_gdc">
|
||
<li class="- topic/li li" data-ofbid="d68043e378__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e380__20250519091510">SPI 控制器的 Wrap burst 必须使能</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e384__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e386__20250519091510">Read Command Bypass 不可以使能</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e390__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e392__20250519091510">CPU 可能发 Linear/Wrap burst 访问</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e396__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e398__20250519091510">SPINOR 需要使能 QE Bit</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e402__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e404__20250519091510">SPINOR 需要进入 QPI 模式</p>
|
||
</li>
|
||
</ul></div></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e410__20250519091510">
|
||
<div class="- topic/div div section" id="id__cache-enable-read-command-bypass"><strong class="+ topic/ph hi-d/b ph b">为什么
|
||
Cache Enable 时，不可以使能 Read Command Bypass</strong>
|
||
<p class="- topic/p p" data-ofbid="d68043e418__20250519091510">CPU Cache 使能时，CPU 发起的访问可能是 Linear 访问，也可能是 Wrap burst 访问，SPI
|
||
XIP 控制器需要根据接收到的 CPU 访问类型，发送命令对 SPINOR 进行切换。</p><p class="- topic/p p" data-ofbid="d68043e420__20250519091510">Cache
|
||
使能时，同时使能 Read Command Bypass
|
||
会导致上述的切换失败。</p><p class="- topic/p p" data-ofbid="d68043e422__20250519091510">具体场景如下：</p><ol class="- topic/ol ol" id="id__ol_k42_ppq_gdc" data-ofbid="id__ol_k42_ppq_gdc">
|
||
<li class="- topic/li li" data-ofbid="d68043e426__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e428__20250519091510">CPU 进行 Linear 访问时，设置了 Read Command Bypass</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e432__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e434__20250519091510">CPU 切换到了 Wrap burst 访问</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e438__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e440__20250519091510">此时 SPI XIP 模块需要发送切换命令到 SPINOR</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e444__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e446__20250519091510">问题：SPINOR 还在 Read Command ByPass
|
||
模式下，需要退出该模式才能接收命令，因此切换命令发送会失败</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d68043e450__20250519091510">
|
||
<p class="- topic/p p" data-ofbid="d68043e452__20250519091510">CPU Wrap burst 访问也会跟着失败</p>
|
||
</li>
|
||
</ol></div>
|
||
</li>
|
||
</ul></div>
|
||
</li>
|
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</ul>
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</section>
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font-family: FangZhengShuSong, Times, serif;
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Update Time: 2025-05-19
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