The modems will work 100% of the time with a windows PC and the Sierra Wireless Watcher application and windows driver. It is not a power issue as we have seen this with 12, 18 and 24 V supplies with and without miniPCI cards. The modem is just not being enumerated properly. Again, this is why I think it must be related to the USB hot plug driver. The only action that seems to always fix it is to hot plug the 598U while the board is powered up. We tried the boot-delay setting, but it appears to make no difference. Sometimes the system will recover and load the driver from a power reset, other times it will not.
There appear to be two different conditions: the USB port completely not discovered and the USB port being partially discovered but being shown as invalid.
So what we are seeing is that the Sierra Wireless 598U USB modem will sometimes be detected and sometimes not.
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