How to Split Edge Firmware into Multiple Parts on Linux
When working with large firmware files, splitting them into smaller chunks can simplify transfer and installation on edge devices. This guide demonstrates how to split the firmware file SPFW-R3.2.2-47xi.raucb into 50 MB chunks using a Linux virtual machine. You can adapt this process for different firmware files, sizes, or naming conventions.
Step 1: Split the Firmware File
Use the split command to divide the firmware into 50 MB chunks while retaining the original file name pattern:
split -b 50M --numeric-suffixes --suffix-length=3 SPFW-R3.2.2-47xi.raucb SPFW-R3.2.2-47xi.raucb.part_
Explanation of options:
- -b 50M → chunk size of 50 MB
- --numeric-suffixes → numeric suffix for parts
- --suffix-length=3 → suffix length (e.g., 001, 002)
- SPFW-R3.2.2-47xi.raucb → original firmware file
- SPFW-R3.2.2-47xi.raucb.part_ → prefix for split parts
Before Splitting
You have the original firmware file:
SPFW-R3.2.2-47xi.raucb
After Splitting
You will see multiple part files:
SPFW-R3.2.2-47xi.raucb.part_000
SPFW-R3.2.2-47xi.raucb.part_001
SPFW-R3.2.2-47xi.raucb.part_002
...
Step 2: Optional – Calculate SHA256 Checksum
To ensure integrity, calculate the checksum of the original firmware:
sha256sum SPFW-R3.2.2-47xi.raucb > original.sha256
This will help validate the combined file later.
Step 3: Transfer Firmware Chunks to the Edge Device (Refer https://www.se.com/ca/en/faqs/FAQ000272309/ for details on file transfer )
Use a secure file transfer tool such as FileZilla to copy the split files to your edge device.
Step 4: Validate Files on the Edge Device
Log in to the edge device using SSH (e.g., via PuTTY) and confirm the files are present:
Step 5: Concatenate Split Files
Recombine the split files into a single firmware file:
cat SPFW-R3.2.2-47xi.raucb.part* > SPFW-R3.2.2-47xi.raucb
Ensure the part file names are correct and all the parts are present.
Step 6: Optional – Validate Checksum
Compare the checksum of the recombined file with the original:
sha256sum SPFW-R3.2.2-47xi.raucb
Both values should match.
Step 7: Install and Reboot
Install the concatenated firmware on the edge device and reboot:
rauc install SPFW-R3.2.2-47xi.raucb
reboot
Step 8: Validate Firmware Version
After reboot, verify the firmware version:
verinfo
Key Notes
- Adjust chunk size (50M) based on your transfer constraints.
- Always validate integrity using checksums.
- Ensure correct sequence when concatenating files.
