Use a USB device on QNX Neutrino

Question

I am trying to use a USB device (mass storage at first and then an OTG device such as a keyboard) on an AX12260 card. QNX Neutrino is the RTOS on which the card is running. I tried to follow this guide to be able to read/write on a USB storage but I didn't succeed. First, the usb -vvv output is null, so I figured I had to start the USB stack. The pci -vvv command tells me that there are two controlers: ohci and ehci. So I proceed to start the stack with io-usb -d ehci (I also tried with ohci option) but it fails: the dll cannot be loaded. The exact output is:

DLL Error Library cannot be found 
FAILED - io_usb_dlopen
unable to load dll devu-ehci.so

At first I thought that it was a path issue, so I found the path to the file and appended it to the $PATH env var, but it didn't work. I tried ldconfig /lib/dll/devu-ehci.so but the command ldconfig doesn't exist. At this point I don't really know what I'm doing wrong. When I connect to the card with Tera Term, one of the first message is that the file system is in read only, could that be a problem ?
Thank you for your time

Answer 1

I found a solution to the issue with io-usb -d ehci. I updated the env var LD_LIBRARY_PATH to add the path to the .so file that couldn't be loaded:

export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/my/path"

then I had to follow the QNX guide and I can now see my USB storage with the df -h command.