In u-boot how load yocto image from nfs share into memory

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Hello Flavio,

To load a Yocto WIC image into memory from an NFS share in U-Boot, you can follow these general steps. However, please note that U-Boot typically supports loading files over TFTP more directly than NFS. If you still prefer to use NFS, you might need to mount the NFS share first and then load the image. Here’s a general approach:

  1. Set up the NFS server: Ensure your NFS server is properly configured and the WIC image is accessible from the NFS share.

  2. Configure U-Boot for NFS:

    • Set the environment variables for the NFS server and the path to the WIC image.
    • Example:
      setenv serverip <NFS_SERVER_IP>
setenv rootpath /path/to/nfs/share
setenv imagefile <wic_image_name>.wic

  3. Mount the NFS share:

    • U-Boot does not natively support mounting NFS shares directly. You might need to use a Linux kernel with NFS support to mount the NFS share and then load the image. Alternatively, you can use TFTP to load the image directly into memory.

  4. Load the image using TFTP (recommended):

    • If you decide to use TFTP, you can load the image directly into memory using the following commands:
      tftpboot ${loadaddr} ${imagefile}

  5. Flash the eMMC:

    • Once the image is loaded into memory, you can proceed to flash it to the internal eMMC. For example:
      mmc dev 0
mmc write ${loadaddr} <start_block> <num_blocks>

Here’s a more detailed example assuming you use TFTP:

  1. Set up TFTP server: Ensure your TFTP server is running and the WIC image is placed in the TFTP root directory.

  2. Configure U-Boot for TFTP:

    setenv serverip <TFTP_SERVER_IP>
setenv imagefile <wic_image_name>.wic
setenv loadaddr 0x12000000  # Example load address

  3. Load the image using TFTP:

    tftpboot ${loadaddr} ${imagefile}

  4. Flash the eMMC:

    mmc dev 0
mmc write ${loadaddr} <start_block> <num_blocks>

If you need more specific instructions or run into issues, please provide additional details about your setup and the exact steps you are following.

Best regards,

[Your Name]

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