uboot基础（2）——uboot cmd-优快云博客

本文链接：https://blog.youkuaiyun.com/scottmvp/article/details/115520568

博客主要介绍了U_BOOT_CMD相关命令，包括内存操作命令如md、mw等，启动相关的boot_android命令，以及杂项命令led。这些命令在Linux系统的Uboot环境中具有重要作用。

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文章目录

U_BOOT_CMD

U_BOOT_CMD

#define U_BOOT_CMD(_name, _maxargs, _rep, _cmd, _usage, _help)          \
        U_BOOT_CMD_COMPLETE(_name, _maxargs, _rep, _cmd, _usage, _help, NULL)

1、内存操作命令

https://blog.youkuaiyun.com/weixin_47932709/article/details/109357938

2、启动相关

boot_android

static int do_boot_android(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])

U_BOOT_CMD(
        boot_android, 5, 0, do_boot_android,
        "Execute the Android Bootloader flow.",
        "<interface> <dev[:part|;part_name]> <slot> [<kernel_addr>]\n"
        "    - Load the Boot Control Block (BCB) from the partition 'part' on\n"
        "      device type 'interface' instance 'dev' to determine the boot\n"
        "      mode, and load and execute the appropriate kernel.\n"
        "      In normal and recovery mode, the kernel will be loaded from\n"
        "      the corresponding \"boot\" partition. In bootloader mode, the\n"
        "      command defined in the \"fastbootcmd\" variable will be\n"
        "      executed.\n"
        "      On Android devices with multiple slots, the pass 'slot' is\n"
        "      used to load the appropriate kernel. The standard slot names\n"
        "      are 'a' and 'b'.\n"
        "    - If 'part_name' is passed, preceded with a ; instead of :, the\n"
        "      partition name whose label is 'part_name' will be looked up in\n"
        "      the partition table. This is commonly the \"misc\" partition.\n"
);

=> boot_android
boot_android - Execute the Android Bootloader flow.

Usage:
boot_android <interface> <dev[:part|;part_name]> <slot> [<kernel_addr>]
    - Load the Boot Control Block (BCB) from the partition 'part' on
      device type 'interface' instance 'dev' to determine the boot
      mode, and load and execute the appropriate kernel.
      In normal and recovery mode, the kernel will be loaded from
      the corresponding "boot" partition. In bootloader mode, the
      command defined in the "fastbootcmd" variable will be
      executed.
      On Android devices with multiple slots, the pass 'slot' is
      used to load the appropriate kernel. The standard slot names
      are 'a' and 'b'.
    - If 'part_name' is passed, preceded with a ; instead of :, the
      partition name whose label is 'part_name' will be looked up in
      the partition table. This is commonly the "misc" partition.

=> boot_android mmc 0
ANDROID: reboot reason: "(none)"
Fdt Ramdisk skip relocation
Booting IMAGE kernel at 0x00280000 with fdt at 0x8300000...


Sysmem Warn: kernel 'reserved-memory' "region@110000"(0x00110000 - 0x00200000) is overlap with [invisible] "SHM" (0x00100000 - 0x00200000)
## Booting Android Image at 0x0027f800 ...
Kernel load addr 0x00280000 size 18863 KiB
## Flattened Device Tree blob at 08300000
   Booting using the fdt blob at 0x8300000
   XIP Kernel Image ... OK
  'reserved-memory' region@110000: addr=110000 size=f0000
   Using Device Tree in place at 0000000008300000, end 000000000831ce26
board_modify_fdt
Adding bank: 0x00200000 - 0x08400000 (size: 0x08200000)
Adding bank: 0x0a200000 - 0x80000000 (size: 0x75e00000)
Total: 91895.702 ms

Starting kernel ...

3、杂项命令

led

int do_led(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])

U_BOOT_CMD(
        led, 4, 1, do_led,
        "manage LEDs",
        "<led_label> on|off|toggle" BLINK "\tChange LED state\n"
        "led [<led_label>\tGet LED state\n"
        "led list\t\tshow a list of LEDs"
);

=> led 
led - manage LEDs

Usage:
led <led_label> on|off|toggle   Change LED state
led [<led_label>        Get LED state
led list                show a list of LEDs
=> led list
system_work_led1 <inactive>
=> led system_work_led1 on
=>

TBC