I face an issue with a 7206vxr having both NPEG1 and an I/O FE controller. The boot sequence of the IOS image first line points to image on the NPEG1 and second to the one on the I/O controller. Still the router boots with the second image from the I/O.
"Console and auxiliary ports: Because the NPE-G1 has a console port and an auxiliary port, and handles the other functionality of the I/O controller, the need for an I/O controller is eliminated. However, an I/O controller can still be used. If an I/O controller is detected in the I/O controller slot, I/O controller functionality defaults to the I/O controller (with the exception of Non-volatile Random Access Memory [NVRAM] and boot flash). The console and auxiliary ports of the NPE-G1 are then disabled."
This suggests that when both an I/O controller and NPE-G1 are present, only the bootflash and NVRAM on the NPE-G1 are useable.
Therefore, in your case, you will not be able to get your router to boot off the NPE-G1. As a definitive test, delete all images from the I/O controller and see if the router boots from the NPE-G1. I suspect it will not...
I checked this by removing the image on the I/O controller card. The router still boots with the image that is present on the NPEG1. Hence we can conclude that with NPEG1 and I/O controller, we can make the router to boot with NPEG1 or I/O controller by specifying the needed ones in the boot sequence.
The one instance of the boot problem that happened to me was some other issue then.
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