Problem booting 2 USB devices

When I have two USB devices plugged in at boot time (say a USB keyboard and a
Mass Storage Device), only one will enumerate. The second will install
properly if I plug it in after boot.

It doesn't seem to matter which USB devices are used - I get the same
behavior with two MSC devices, for example.

I'm puzzled because the devices I'm using are pretty generic, and the BSP
that I'm sysgenning uses unmodified, generic drivers. Shouldn't I expect
that generic devices with generic code should work?

I've searched this forum quite a bit on this problem, but haven't found any
clear direction to address this.

Thanks,
Chuck
.

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