Linux下构建镜像遇ubinize错误，.img文件未生成

Hey there, let's work through this issue you're hitting—you got through all the prep steps to build your image, but ubinize threw that volume size warning and didn't spit out your final .img file. Let's break down what's going on and how to fix it:

First, Understand the Warning #

That message:

ubinize: volume size was not specified in section "ubifs", assume minimum to fit image "tmp/ubifs.img"98660352 bytes (94.1 MiB)

is just ubinize telling you it had to guess the required volume size since you didn't define it explicitly. But this warning alone shouldn't stop the .img from being created—so we need to dig into the actual blockers.

Step 1: Explicitly Add vol_size to Your Ubinize Config #

The most common fix here is to add the volume size directly to your ubinize configuration file (usually named ubinize.cfg). Even though ubinize calculated the size automatically, some versions require this parameter to be explicitly set to complete the process.

Update your [ubifs] section to include the size from the warning:

[ubifs]
mode=ubi
image=tmp/ubifs.img
vol_id=0
vol_name=rootfs
vol_size=98660352  # Match the value from your warning
vol_flags=autoresize  # Optional, but useful for dynamic resizing on target

Step 2: Verify the Temporary ubifs.img File #

Make sure the tmp/ubifs.img file ubinize is referencing actually exists and is valid:

1. Run this command to check the file:

   ls -lh tmp/ubifs.img
   

2. Confirm the size matches the 94.1 MiB from the warning. If the file is missing or corrupted, go back to your mkfs.ubifs step—you might have used incorrect parameters (like wrong page size or erase block size) for your target device.

A correct mkfs.ubifs command example looks like this (adjust parameters to match your hardware):

mkfs.ubifs -r rootfs -m 2048 -e 129024 -c 768 -o tmp/ubifs.img

Step 3: Check Your Full Ubinize Command #

Ensure you're running ubinize with all required parameters, especially the physical erase block size (-p) and output path (-o):

ubinize -o final_image.img -p 131072 -m 2048 ubinize.cfg

• -p: Set this to your target device's physical erase block size (common values are 128KiB = 131072 bytes)
• -m: Match the page size you used in mkfs.ubifs
• -o: Make sure you're specifying the path where you want the final .img to be saved

Step 4: Check Permissions and Disk Space #

• If you're saving the final image to a system directory (like /opt or /usr/local), run ubinize with sudo to get write permissions.
• Verify you have enough free disk space—building UBI images can take up temporary space equal to at least twice the size of your rootfs.

Wrap-Up #

Start by adding the explicit vol_size to your config—this resolves most cases where ubinize bails despite the warning. Then work through the other checks to make sure your temporary files, command parameters, and system setup are all correct.

内容的提问来源于stack exchange，提问作者Adnan Shafiq