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Diagnose Mfgtool Bad Data CRC

Question asked by Simon Rogers on Jan 20, 2017
Latest reply on Jan 26, 2017 by Simon Rogers

I'm setting up Mfgtool re-flashing of my Hummingboard i.MX6Q system. I've built a mfgtool U-boot, kernel and rootfs using Yocto.

When I boot over OTG USB using Mfgtool my target sometimes successfully boots into the linux kernel. Most attempts fail with:

## Loading init Ramdisk from Legacy Image at 12c00000 ...    
Image Name:   fsl-image-mfgtool-initramfs-soli   
Image Type:   ARM Linux RAMDisk Image (gzip compressed)   
Data Size:    88443107 Bytes = 84.3 MiB   
Load Address: 00000000   
Entry Point:  00000000   
Verifying Checksum ... Bad Data CRC
Ramdisk image is corrupt or invalid

Because of the intermittent nature of the failure I suspected DDR calibration problems. So I've run the DDR Stress Tester with the settings used by my Mfgtool U-boot. The stress test passed without needing calibration data changes.


If I modify my ucl2.xml to load the initramfs file into memory twice in different locations, and then run cmp in U-boot, the data is different. Run cmp again and I get the same difference. So the error occurred during the write to RAM, not the read.


If I do a cp in u-boot to copy a large block of data and then a cmp to compare the memory areas, they are the same.

Can I then conclude that my errors occur during USB data transfer? 

Can anyone suggest how to diagnose further, or what could be the problem?