嵌入式Linux--U-Boot（八）SPI Flash命令使用

浅浅的花香味﹌ 2023-01-22 07:54 12阅读 0赞

### 文章目录 ###

*  前言
 *   *  具体用法
     *  使用范例
     *  如何验证读写效果
 *  一、进入Uboot命令行模式

# 前言 #

U-boot中如果支持spi/qspi flash，那么可以在U-Boot的命令行模式下使用sf的erase,read,write命令来操作spi flash.

*  `sf read`用来读取flash数据到内存
 *  `sf write`写内存数据到flash
 *  `sf erase`擦除指定位置，指定长度的flash内容，擦除后内容全为1即0xff。

## 具体用法 ##

sf probe \[\[bus:\]cs\] \[hz\] \[mode\] - init flash device on given SPI bus and chip select

sf read addr offset len - read `len' bytes starting at`offset’ to memory at \`addr’

sf write addr offset len - write `len' bytes from memor at`addr’ to flash at \`offset’

sf erase offset \[+\]len - erase `len' bytes from`offset’ `+len' round up`len’ to block size

sf update addr offset len - erase and write `len' bytes from memory at`addr’ to flash at \`offset’

## 使用范例 ##

sf probe 0

在使用sf read sf write之前,一定要调用sf probe

sf write 0x82000000 0x0 0x20000

把内存0x8200 0000处的数据, 写入flash的偏移0x0, 写入数据长度为0x20000(128KB), 操作偏移和长度最小单位是Byte

sf read 0x82000000 0x10000 0x20000

把flash偏移0x10000(64KB)处, 长度为0x20000(128KB)的数据, 写入到内存0x82000000, 操作偏移和长度最小单位是Byte

sf erase 0x0 0x10000

擦除偏移0x0处, 到0x10000之间的擦除块, 擦除操作是以erase block为单位的, 要求offset和len参数必须是erase block对齐的

## 如何验证读写效果 ##

可以结合uboot md命令, sf read, sf write都涉及到内存操作, 可以用md查看内存数据

md 0x0 0x100

打印0开始, 长度范围256字节的内存数据

# 一、进入Uboot命令行模式 #

=> help
    ?       - alias for 'help'
    base    - print or set address offset
    bdinfo  - print Board Info structure
    boot    - boot default, i.e., run 'bootcmd'
    bootd   - boot default, i.e., run 'bootcmd'
    bootefi - Boots an EFI payload from memory
    bootelf - Boot from an ELF image in memory
    bootm   - boot application image from memory
    bootmenu- ANSI terminal bootmenu
    bootp   - boot image via network using BOOTP/TFTP protocol
    bootvx  - Boot vxWorks from an ELF image
    bootz   - boot Linux zImage image from memory
    clrlogo - fill the boot logo area with black
    cmp     - memory compare
    coninfo - print console devices and information
    cp      - memory copy
    crc32   - checksum calculation
    dhcp    - boot image via network using DHCP/TFTP protocol
    dm      - Driver model low level access
    echo    - echo args to console
    editenv - edit environment variable
    env     - environment handling commands
    exit    - exit script
    ext2load- load binary file from a Ext2 filesystem
    ext2ls  - list files in a directory (default /)
    ext4load- load binary file from a Ext4 filesystem
    ext4ls  - list files in a directory (default /)
    ext4size- determine a file's size false - do nothing, unsuccessfully fatinfo - print information about filesystem fatload - load binary file from a dos filesystem fatls - list files in a directory (default /) fatsize - determine a file's size
    fatwrite- write file into a dos filesystem
    fdt     - flattened device tree utility commands
    fstype  - Look up a filesystem type
    go      - start application at address 'addr'
    gpio    - query and control gpio pins
    help    - print command description/usage
    iminfo  - print header information for application image
    imxtract- extract a part of a multi-image
    itest   - return true/false on integer compare
    load    - load binary file from a filesystem
    loadb   - load binary file over serial line (kermit mode)
    loads   - load S-Record file over serial line
    loadx   - load binary file over serial line (xmodem mode)
    loady   - load binary file over serial line (ymodem mode)
    loop    - infinite loop on address range
    ls      - list files in a directory (default /)
    md      - memory display
    meminfo - display memory information
    mii     - MII utility commands
    mm      - memory modify (auto-incrementing address)
    mmc     - MMC sub system
    mmcinfo - display MMC info
    mw      - memory write (fill)
    nfs     - boot image via network using NFS protocol
    nm      - memory modify (constant address)
    part    - disk partition related commands
    ping    - send ICMP ECHO_REQUEST to network host
    printenv- print environment variables
    pxe     - commands to get and boot from pxe files
    reset   - Perform RESET of the CPU
    run     - run commands in an environment variable
    save    - save file to a filesystem
    saveenv - save environment variables to persistent storage
    setenv  - set environment variables
    setexpr - set environment variable as the result of eval expression
    sf      - SPI flash sub-system
    showvar - print local hushshell variables
    size    - determine a file's size
    sleep   - delay execution for some time
    source  - run script from memory
    sspi    - SPI utility command
    sysboot - command to get and boot from syslinux files
    test    - minimal test like /bin/sh
    tftpboot- boot image via network using TFTP protocol
    true    - do nothing, successfully
    usb     - USB sub-system
    usbboot - boot from USB device
    version - print monitor, compiler and linker version
    =>

使用命令`help sf`

=> help sf
    sf - SPI flash sub-system
    
    Usage:
    sf probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus
                                      and chip select
    sf read addr offset|partition len       - read `len' bytes starting at `offset' or from start of mtd `partition'to memory at `addr'
    sf write addr offset|partition len      - write `len' bytes from memory at `addr' to flash at `offset' or to start of mtd `partition'
    sf erase offset|partition [+]len        - erase `len' bytes from `offset' or from start of mtd `partition' `+len' round up `len' to block size sf update addr offset|partition len - erase and write `len' bytes from memory at `addr' to flash at `offset'
                                              or to start of mtd `partition'
    sf protect lock/unlock sector len       - protect/unprotect 'len' bytes starting
                                              at address 'sector'
    
    => sf probe
    SF: Detected xt25f128b with page size 256 Bytes, erase size 4 KiB, total 16 MiB