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< / div > < div class = "- topic/body concept/conbody body conbody" > < section class = "- topic/section section" id = "spi_nor_configuration__section_s5t_g5y_c1c" data-ofbid = "spi_nor_configuration__section_s5t_g5y_c1c" > < h2 class = "- topic/title title sectiontitle" > 修改 DTS< / h2 >
< div class = "- topic/p p" data-ofbid = "d177583e28__20250121171623" > 要在实际项目中使用 SPI NOR 设备，还需要修改 DTS 配置，详细流程如下所示：< ol class = "- topic/ol ol" id = "spi_nor_configuration__ul_vmr_zgc_ndc" data-ofbid = "spi_nor_configuration__ul_vmr_zgc_ndc" > < li class = "- topic/li li" data-ofbid = "d177583e31__20250121171623" >
< div class = "- topic/p p" data-ofbid = "d177583e33__20250121171623" > 在 < span class = "+ topic/ph sw-d/filepath ph filepath" > board.dts< / span > 中具体的 SPI 控制器下添加
< code class = "+ topic/ph pr-d/codeph ph codeph" > jedec,spi-nor< / code >
设备。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "spi_nor_configuration__pre_t5t_g5y_c1c" data-ofbid = "spi_nor_configuration__pre_t5t_g5y_c1c" > & spi0 {
pinctrl-names = < span class = "hl-string" > "default"< / span > ;
pinctrl-< span class = "hl-number" > 0< / span > = < & spi0_pins_a> ;
status = < span class = "hl-string" > "okay"< / span > ;
spi-max-frequency = < < span class = "hl-number" > 100000000< / span > > ;
spi-flash@< span class = "hl-number" > 0< / span > {
#address-cells = < < span class = "hl-number" > 1< / span > > ;
#size-cells = < < span class = "hl-number" > 1< / span > > ;
compatible = < span class = "hl-string" > "jedec,spi-nor"< / span > ; < em class = "hl-comment" > //固定值，所有基于 dts 的 SPI NOR 均声明此< / em >
spi-max-frequency = < < span class = "hl-number" > 100000000< / span > > ; < em class = "hl-comment" > //最大频率，固定值< / em >
spi-tx-bus-width = < < span class = "hl-number" > 4< / span > > ;
spi-rx-bus-width = < < span class = "hl-number" > 4< / span > > ;
reg = < < span class = "hl-number" > 0< / span > > ; < em class = "hl-comment" > //固定值，一般不需修改< / em >
status = < span class = "hl-string" > "okay"< / span > ;
};
};
< / pre > < / div >
< / li > < li class = "- topic/li li" data-ofbid = "d177583e44__20250121171623" >
< div class = "- topic/p p" data-ofbid = "d177583e46__20250121171623" > 在 < span class = "+ topic/ph sw-d/filepath ph filepath" > board-u-boot.dtsi< / span > 文件中，将
< code class = "+ topic/ph pr-d/codeph ph codeph" > jedec,spi-nor< / code > 设备标记为
< code class = "+ topic/ph pr-d/codeph ph codeph" > u-boot,dm-pre-reloc< / code > ，确保 SPL
无法识别和使用。< pre class = "+ topic/pre pr-d/codeblock pre codeblock language-c" id = "spi_nor_configuration__pre_u5t_g5y_c1c" data-ofbid = "spi_nor_configuration__pre_u5t_g5y_c1c" > & spi0 {
u-boot,dm-pre-reloc;
spi-flash@< span class = "hl-number" > 0< / span > {
u-boot,dm-pre-reloc;
};
};
< / pre > < / div >
< / li > < / ol > < / div >
< / section > < section class = "- topic/section section" id = "spi_nor_configuration__section_zbw_cqy_c1c" data-ofbid = "spi_nor_configuration__section_zbw_cqy_c1c" > < h2 class = "- topic/title title sectiontitle" > 配置 Bus Width< / h2 >
< div class = "- topic/p p" data-ofbid = "d177583e66__20250121171623" > 根据 SPI NOR 芯片的总线宽度，正确设置 < code class = "+ topic/ph pr-d/codeph ph codeph" > spi-tx-bus-width< / code > ： < ul class = "- topic/ul ul" id = "spi_nor_configuration__ul_j44_3hc_ndc" data-ofbid = "spi_nor_configuration__ul_j44_3hc_ndc" > < li class = "- topic/li li" data-ofbid = "d177583e72__20250121171623" >
< p class = "- topic/p p" data-ofbid = "d177583e74__20250121171623" > 标准 SPI NOR 配置为 1< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d177583e77__20250121171623" >
< p class = "- topic/p p" data-ofbid = "d177583e79__20250121171623" > Dual SPI NOR 配置为 2< / p >
< / li > < li class = "- topic/li li" data-ofbid = "d177583e82__20250121171623" >
< p class = "- topic/p p" data-ofbid = "d177583e84__20250121171623" > Quad SPI NOR 配置为 4< / p >
< / li > < / ul > < / div >
< div class = "- topic/note note note note_note" id = "spi_nor_configuration__note_xrf_jhb_ndc" data-ofbid = "spi_nor_configuration__note_xrf_jhb_ndc" > < span class = "note__title" > 注：< / span > 窄总线设备无法在宽总线模式下工作。< / 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 = "#spi_nor_configuration__section_s5t_g5y_c1c" data-tocid = "spi_nor_configuration__section_s5t_g5y_c1c" > 修改 DTS< / a > < / div > < / li > < li class = "section-item" > < div class = "section-title" > < a href = "#spi_nor_configuration__section_zbw_cqy_c1c" data-tocid = "spi_nor_configuration__section_zbw_cqy_c1c" > 配置 Bus Width< / a > < / div > < / li > < / ul > < / div >
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