> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 使用 U-Boot 日志进行故障排查

U-Boot 日志提供有关 U-Boot 开始和结束的信息。

以下是 U-Boot 日志示例：

```text theme={null}
U-Boot <version> (<date>)

Model: Qualcomm <board-name>
DRAM:  6 GiB
Core:  296 devices, 31 uclasses, devicetree: separate
MMC:   2
Loading Environment from <storage>...
In:    serial,button-kbd
Out:   serial,vidconsole
Err:   serial,vidconsole
Model: Qualcomm Technologies, Inc. <board-name>
Net:   No ethernet found.

Hit any key to stop autoboot: 0
Scanning for bootflows in all bootdevs
Seq  Method       State   Uclass    Part  Name                      Filename
---  -----------  ------  --------  ----  ------------------------  ----------------
Scanning global bootmeth 'efi_mgr':
  0  efi_mgr      ready   (none)       0  <>
** Booting bootflow '<>' with efi_mgr
```

如果在 U-Boot 执行期间按任意键，U-Boot CLI 将变为可用状态，您可以运行 U-Boot 命令。有关可用命令的列表，请参阅[支持的 U-Boot 命令](./u-boot-on-qualcomm-linux#supported-u-boot-commands)。