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UUU on iMX6DL: UDC device or resource busy?

Question asked by Stuart Juengst on Oct 14, 2019
Latest reply on Oct 17, 2019 by Aldo Gutierrez

I'm working on back-porting the new MFG-Tool (aka UUU) to our i.MX6DL-based product.  I think it's close to working, but it seems that after linux boots, the ufb daemon is blocking on the read from g_ep_source, while the uuu tool on the host times out after sending a FBK: ucmd command (see attached uuu-log.txt).  I noticed that the /linuxrc script gets a "device or resource busy" error when attempting to write to UDC (line 139).  Is this a problem, or is it simply because it's a composite device or something?  Otherwise, what might be preventing the FBK command from propagating up to the ufb daemon? 


Thanks in advance,