Linux-笔记 开发板Uboot命令使用

将之前自学的知识整理了一下笔记，以便回忆

信息查询命令

1、help/?：查看所支持命令

=> ? md
md - memory display

Usage:
md [.b, .w, .l] address [# of objects]

 2、bdinfo：查询板子信息

=> bdinfo
arch_number = 0x00000000
boot_params = 0x80000100
DRAM bank   = 0x00000000
-> start    = 0x80000000
-> size     = 0x20000000
eth0name    = FEC1
ethaddr     = b8:ae:1d:01:00:00
current eth = FEC1
ip_addr     = 192.168.31.100
baudrate    = 115200 bps
TLB addr    = 0x9FFF0000
relocaddr   = 0x9FF47000
reloc off   = 0x18747000
irq_sp      = 0x9EF44EA0
sp start    = 0x9EF44E90
FB base     = 0x00000000

3、printenv：输出环境变量信息

=> printenv
baudrate=115200
board_name=EVK
board_rev=14X14
boot_fdt=try
bootargs=comsole=tty1 console=ttymxc0,115200 root=/dev/nfs nfsroot=192.168.31.121:/home/lxz/linux/nfs/rootfs,proto=tcp rw ip=192.168.31.102:192.168.31.121:192.168.31.1:255.255.255.0::eth0:off
bootcmd=tftp 80800000 zImage;tftp 83000000 imx6ull-alientek-emmc.dtb;bootz 80800000 - 83000000
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootdelay=3
bootscript=echo Running bootscript from mmc ...; source
console=ttymxc0
ethact=FEC1
ethaddr=b8:ae:1d:01:00:00
省略...

4、version：版本号

=> version

U-Boot 2016.03 (Oct 17 2023 - 10:40:58 +0800)
arm-linux-gnueabihf-gcc (Linaro GCC 4.9-2017.01) 4.9.4
GNU ld (Linaro_Binutils-2017.01) 2.24.0.20141017 Linaro 2014_11-3-git

环境变量命令

5、setenv：设置环境变量

=> setenv cc 123
=> printenv cc
cc=123
=>

6、saveenv：保存环境变量

=> saveenv
Saving Environment to MMC...
Writing to MMC(1)... done

内存操作命令

1、显示内存值：md

md[.b, .w, .l] address [# of objects]
md.b 80000000 14 //查看0x80000000开始的20个字节的内存值    uboot中的命令数字都是十六进制

2、修改内存值：nm

nm [.b, .w, .l] address
nm.l 80000000
=> nm.l 80000000
80000000: 0500e031 ? 修改的值
80000000: 修改的值 ？ q
=>

3、自增修改指定地址的内存值：mm 

4、指定数据填充内存：mw

mw [.b, .w, .l] address value [count]
=> mw.l 80000000 0A0A0A0A 10
=> md.l 80000000 10
80000000: 0a0a0a0a 0a0a0a0a 0a0a0a0a 0a0a0a0a
80000010: 0a0a0a0a 0