“FMC device tree configuration”的版本间的差异

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== Article purpose ==
 
== Article purpose ==
This article explains how to configure the [[FMC internal peripheral|'''FMC''' internal peripheral]] when it is assigned to the Linux<sup>&reg;</sup> OS. In that case, it is controlled by the  [[MTD overview|MTD framework]].
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本文介绍如何在将 [[FMC internal peripheral|'''FMC''' internal peripheral]] 分配给Linux<sup>&reg;</sup> 操作系统时对其进行配置。 在这种情况下,它由[[MTD overview|MTD framework]]控制。
  
The configuration is performed using the [[Device tree|device tree]] mechanism that provides a hardware description of the FMC peripheral, used by the STM32 FMC Linux driver and by  the MTD framework.
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使用[[Device tree|device tree]] 机制执行配置,该机制提供STM32 FMC Linux驱动程序和MTD框架使用的FMC外设的硬件描述。
  
 
== DT bindings documentation ==
 
== DT bindings documentation ==
  
The FMC device tree bindings are composed of:
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FMC设备树绑定由以下组成:
  
* generic MTD nand bindings <ref>{{CodeSource | Linux kernel | Documentation/devicetree/bindings/mtd/nand.txt}}</ref>.
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* 通用MTD nand绑定 <ref>{{CodeSource | Linux kernel | Documentation/devicetree/bindings/mtd/nand.txt}}</ref>.
  
* FMC driver bindings <ref> {{CodeSource | Linux kernel | Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt}} </ref>.
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* FMC驱动程序绑定 <ref> {{CodeSource | Linux kernel | Documentation/devicetree/bindings/mtd/stm32-fmc2-nand.txt}} </ref>.
  
 
== DT configuration ==
 
== DT configuration ==
This hardware description is a combination of the '''STM32 microprocessor''' device tree files (''.dtsi'' extension) and '''board''' device tree files (''.dts'' extension). See the [[Device tree]] for an explanation of the device tree file split.
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该硬件描述是“''STM32微处理器”''设备树文件(扩展名为.dtsi)和“''板子”设备树文件(扩展名为.dts)的组合。 有关设备树文件分割的说明,请参见[[Device tree]]
  
'''STM32CubeMX''' can be used to generate the board device tree. Refer to [[#How_to_configure_the_DT_using_STM32CubeMX|How to configure the DT using STM32CubeMX]] for more details.
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'''STM32CubeMX'''可用于生成板卡设备树。 有关更多详细信息,请参考[[#How_to_configure_the_DT_using_STM32CubeMX  [[#How_to_configure_the_DT_using_STM32CubeMX|How to configure the DT using STM32CubeMX]] .
  
 
===DT configuration (STM32 level) ===
 
===DT configuration (STM32 level) ===
The FMC peripheral node is located in ''stm32mp157c.dtsi''<ref>{{CodeSource | Linux kernel | arch/arm/boot/dts/stm32mp157c.dtsi}}</ref> file.
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FMC外设节点位于“ stm32mp157c.dtsi”中。<ref>{{CodeSource | Linux kernel | arch/arm/boot/dts/stm32mp157c.dtsi}}</ref>文件。
  
 
     fmc: nand-controller@58002000 {                          {{highlight|Comments}}
 
     fmc: nand-controller@58002000 {                          {{highlight|Comments}}
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     };
 
     };
  
{{Warning|This device tree part related to the STM32 should be kept as is, customer should not modify it.}}
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{{Warning|与STM32相关的设备树部分应保持原样,客户不应对其进行修改。}}
  
 
=== DT configuration (board level) ===
 
=== DT configuration (board level) ===
The FMC peripheral may connect to one SLC NAND Flash memory (with a maximum of 2 dies per package).
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FMC外设可以连接到一个SLC NAND闪存(每个封装最多2个管芯)。
  
 
     &fmc {                                                    {{highlight|Comments}}     
 
     &fmc {                                                    {{highlight|Comments}}     
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     };
 
     };
  
The supported ECC strength and step size are:
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支持的ECC强度和步长为:
 
* nand-ecc-strength = <1>, nand-ecc-step-size = <512> (HAMMING).
 
* nand-ecc-strength = <1>, nand-ecc-step-size = <512> (HAMMING).
 
* nand-ecc-strength = <4>, nand-ecc-step-size = <512> (BCH4).
 
* nand-ecc-strength = <4>, nand-ecc-step-size = <512> (BCH4).
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=== DT configuration examples ===
 
=== DT configuration examples ===
The below example shows how to configure the FMC controller when a SLC 8-bit NAND Flash memory device is connected (ECC requirement: 8 bits / 512 bytes).
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以下示例显示了在连接SLC 8位NAND闪存设备时(ECC要求:8位/ 512字节)如何配置FMC控制器.
  
 
     &fmc {                                               
 
     &fmc {                                               
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     };
 
     };
  
The below example shows how to configure the FMC controller when a SLC 8-bit NAND Flash memory device is connected (ECC requirement: 4 bits / 512 bytes).
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下例显示了连接SLC 8位NAND闪存设备时的FMC控制器配置(ECC要求:4位/ 512字节).
  
 
     &fmc {                         
 
     &fmc {                         
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==How to configure the DT using STM32CubeMX==
 
==How to configure the DT using STM32CubeMX==
The [[STM32CubeMX]] tool can be used to configure the STM32MPU device and get the corresponding [[Device_tree#STM32|platform configuration device tree]] files.<br />
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[[STM32CubeMX]] 工具可用于配置STM32MPU设备并获取相应的[[Device_tree#STM32|platform configuration device tree]] 文件。<br />
The STM32CubeMX may not support all the properties described in the above [[#DT bindings documentation|DT bindings documentation]] paragraph. If so, the tool inserts '''user sections''' in the generated device tree. These sections can then be edited to add some properties and they are preserved from one generation to another. Refer to [[STM32CubeMX]] user manual for further information.
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STM32CubeMX可能不支持以上[[#DT bindings documentation|DT bindings documentation]] 段中描述的所有属性。 如果是这样,该工具会在生成的设备树中插入'''用户部分'''。 然后可以编辑这些部分以添加某些属性,并将它们代代相传。 有关详细信息,请参阅[[STM32CubeMX]] 用户手册。
  
 
==References==
 
==References==
Please refer to the following links for full description:
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有关完整说明,请参阅以下链接:
  
 
<references />
 
<references />
 
<noinclude>
 
{{ArticleBasedOnModel | Peripheral or framework device tree configuration model}}
 
[[Category:Device tree configuration]]
 
[[Category:Mass storage]]
 
</noinclude>
 

2020年11月10日 (二) 11:57的最新版本

Article purpose

本文介绍如何在将 FMC internal peripheral 分配给Linux® 操作系统时对其进行配置。 在这种情况下,它由MTD framework控制。

使用device tree 机制执行配置,该机制提供STM32 FMC Linux驱动程序和MTD框架使用的FMC外设的硬件描述。

DT bindings documentation

FMC设备树绑定由以下组成:

  • 通用MTD nand绑定 [1].
  • FMC驱动程序绑定 [2].

DT configuration

该硬件描述是“STM32微处理器”设备树文件(扩展名为.dtsi)和“板子”设备树文件(扩展名为.dts)的组合。 有关设备树文件分割的说明,请参见Device tree

STM32CubeMX可用于生成板卡设备树。 有关更多详细信息,请参考[[#How_to_configure_the_DT_using_STM32CubeMX How to configure the DT using STM32CubeMX .

DT configuration (STM32 level)

FMC外设节点位于“ stm32mp157c.dtsi”中。[3]文件。

   fmc: nand-controller@58002000 {                           Comments
       compatible = "st,stm32mp15-fmc2";
       reg = <0x58002000 0x1000>,                            --> First region contains the register location
             <0x80000000 0x1000>,                            --> Régions 2 to 4 respectively contain the data, command and address space for CS0
             <0x88010000 0x1000>,                            
             <0x88020000 0x1000>,                            
             <0x81000000 0x1000>,                            --> Régions 5 to 7 contain the same areas for CS1
             <0x89010000 0x1000>,                            
             <0x89020000 0x1000>;                            
       interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;        --> The interrupt number used
       dmas = <&mdma1 20 0x10 0x12000A02 0x0 0x0 0>,         --> DMA specifiers [4]
              <&mdma1 20 0x10 0x12000A08 0x0 0x0 0>,
              <&mdma1 21 0x10 0x12000A0A 0x0 0x0 0>;
       dma-names = "tx", "rx", "ecc";
       clocks = <&rcc FMC_K>;                  
       resets = <&rcc FMC_R>;                           
       status = "disabled";
   };
Warning.png 与STM32相关的设备树部分应保持原样,客户不应对其进行修改。

DT configuration (board level)

FMC外设可以连接到一个SLC NAND闪存(每个封装最多2个管芯)。

   &fmc {                                                    Comments     
       pinctrl-names = "default", "sleep";                   --> For pinctrl configuration, please refer to Pinctrl device tree configuration
       pinctrl-0 = <&fmc2_pins_a>;
       pinctrl-1 = <&fmc2_sleep_pins_a>;
       status = "okay";                                      --> Enable the node
       #address-cells = <1>;
       #size-cells = <0>;
nand: nand@0 { reg = <0>; --> Describe the CS line assigned to the NAND chip nand-on-flash-bbt; --> Store the bad block table on NAND Flash memory nand-ecc-strength = <8>; --> Number of bits to correct per ECC step nand-ecc-step-size = <512>; --> Number of data bytes that are covered by a single ECC step #address-cells = <1>; #size-cells = <1>; }; };

支持的ECC强度和步长为:

  • nand-ecc-strength = <1>, nand-ecc-step-size = <512> (HAMMING).
  • nand-ecc-strength = <4>, nand-ecc-step-size = <512> (BCH4).
  • nand-ecc-strength = <8>, nand-ecc-step-size = <512> (BCH8).

DT configuration examples

以下示例显示了在连接SLC 8位NAND闪存设备时(ECC要求:8位/ 512字节)如何配置FMC控制器.

   &fmc {                                              
       pinctrl-names = "default", "sleep";                  
       pinctrl-0 = <&fmc2_pins_a>;
       pinctrl-1 = <&fmc2_sleep_pins_a>;
       status = "okay";                                      
       #address-cells = <1>;
       #size-cells = <0>;
nand: nand@0 { reg = <0>; nand-on-flash-bbt; #address-cells = <1>; #size-cells = <1>;
partition@0 { ... }; }; };

下例显示了连接SLC 8位NAND闪存设备时的FMC控制器配置(ECC要求:4位/ 512字节).

   &fmc {                        
       pinctrl-names = "default", "sleep";            
       pinctrl-0 = <&fmc2_pins_a>;
       pinctrl-1 = <&fmc2_sleep_pins_a>;
       status = "okay";                                      
       #address-cells = <1>;
       #size-cells = <0>;
nand: nand@0 { reg = <0>; nand-on-flash-bbt; nand-ecc-strength = <4>; nand-ecc-step-size = <512>; #address-cells = <1>; #size-cells = <1>;
partition@0 { ... }; }; };

How to configure the DT using STM32CubeMX

STM32CubeMX 工具可用于配置STM32MPU设备并获取相应的platform configuration device tree 文件。
STM32CubeMX可能不支持以上DT bindings documentation 段中描述的所有属性。 如果是这样,该工具会在生成的设备树中插入用户部分。 然后可以编辑这些部分以添加某些属性,并将它们代代相传。 有关详细信息,请参阅STM32CubeMX 用户手册。