reference :https://github.com/lentinj/u-boot/blob/master/doc/README.autoboot how to enable protect sonsole in uboot stage ? we can add follow contest in include/configs/xxxx.h +// add by panzidong for support  protect uboot console +#define CONFIG_AU…

转载于:http://blog.csdn.net/jgdu1981/article/details/8643057 linux启动时uboot传递进console=ttyS0,115200n8的参数 内核中用__setup()宏声明参数处理的方法 关于__setup宏参考 early_param和__setup宏 __setup("console=", console_setup); console_setup函数处理 1.console_cmdline结构体 struct conso…

find cpu datasheet , watchdog relate registers: 0x18060008 watchdong timer control 0x1806000c watchdog timer we can read and write watchdog register under uboot console: #mw 0x1806000c 0xffffffff  1 #mw 0x1806000c 0x10000000  1 #mw 0x18060008    0x3 …

uboot commad test test - minimal test like /bin/sh so we can use test command to some judge for example, test –n $uenvcmd    test var uenvcmd length !eq  zero detail learning you  can reference url: https://www.cnblogs.com/tankblog/p/6160808.html Not…

reference: uboot_dir/doc/README.distro Linux distributions are faced with supporting a variety of boot mechanisms,environments or bootloaders (PC BIOS, EFI, U-Boot, Barebox, ...). This makeslife complicated. Worse, bootloaders such as U-Boot have a c…

pseudocode: If(reset_button was pressed ) { Change  uboot env bootslot^1 }…

design: when uboot load kerne failed,we can switch to stanbdy system; how to realize: when boot fail, we can let uboot env bootKenrelFailCount++, then save to uboot_env partiton.    watchdog timeout will trigger cpu reset, when bootKernelFailCount bi…

By passing the kernel panic parameter, the system automatically resets after 3 seconds when kernel panic happen example: bootargs  'board=xxxxx console=ttyS0,115200 ubi.mtd=overlay rootfs=/dev/mtdblock:rootfs  rootfstype=squashfs noinitrd init=/sbin/…

reference: http://www.denx.de/wiki/DULG/UBootCmdGroupExec => help source source - run script from memory Usage: source [addr] - run script starting at addr - A valid image header must be present => With the source command you can run "shell&quo…

控制台输出语句: print println example: scala> print("i=");print(i)i=345scala> println("hello ");println("world")hello world…