2. Burn the U-Boot file by following the procedures for burning a U-Boot file over USB.
Select the U-Boot files of corresponding development boards for burning by referring to [Programming Flash Memory on the Hi3516](https://device.harmonyos.com/en/docs/ide/user-guides/hi3516_upload-0000001052148681)/[Programming Flash Memory on the Hi3518](https://device.harmonyos.com/en/docs/ide/user-guides/hi3518_upload-0000001057313128)
Select the U-Boot files of corresponding development boards for burning by referring to [Programming Flash Memory on the Hi3516](../quick-start/quickstart-lite-steps-hi3516-running.md)/[Programming Flash Memory on the Hi3518](../quick-start/quickstart-lite-steps-hi3518-running.md)
3. Log in to the serial port after the burning is complete.
@@ -247,7 +247,7 @@ To build such an app, we can create a page that has a flexible layout with two r
## Signing and Packaging<a name="section10601181101516"></a>
After finishing writing the app code, you need to sign and package the app before running it on a real device. For details, see [Signing and Packaging Guide](../../application-dev/quick-start/configuring-openharmony-app-signature.md).
After finishing writing the app code, you need to sign and package the app before running it on a real device. For details, see [Signing and Packaging Guide](https://developer.harmonyos.com/en/docs/documentation/doc-guides/ohos-debugging-and-running-0000001263040487#section17660437768)).
## Running on the Real Device<a name="section092721731511"></a>
>- When compiling user programs and required libraries, add the option **-funwind-tables -rdynamic -g** for stack backtracking.
>- The **-mfloat-abi=softfp**, **-mcpu=cortex-a7**, and **-mfpu=neon-vfpv4** options specify the floating-point calculation optimization, chip architecture, and FPU, which must be the same as the compilation options used by the libc library. Otherwise, the libc library file cannot be found during the link time.
>- **-target arm-liteos** specifies the path of the library files related to the compiler.
>- **--sysroot=/home/<user-name\>/harmony/out/hispark\_taurus/ipcamera\_hispark\_taurus/sysroot** specifies the root directory of the compiler library files. In this example, the OpenHarmony project code is stored in **/home/<user-name\>/harmony**. The **out/hispark\_taurus/ipcamera\_hispark\_taurus** directory indicates the product specified by the **hb set** command during compilation. In this example, **ipcamera\_hispark\_taurus** is the product specified.
>- **--sysroot=/home/<user-name\>/directory/out/hispark\_taurus/ipcamera\_hispark\_taurus/sysroot** specifies the root directory of the compiler library files. In this example, the OpenHarmony project code is stored in **/home/<user-name\>/directory**. The **out/hispark\_taurus/ipcamera\_hispark\_taurus** directory indicates the product specified by the **hb set** command during compilation. In this example, **ipcamera\_hispark\_taurus** is the product specified.
>- **$\(clang -mfloat-abi=softfp -mcpu=cortex-a7 -mfpu=neon-vfpv4 -target arm-liteos -print-file-name=libunwind.a\)** specifies the path of the unwind library.
