expansion ROM = disabled on video and ethernet cards

I just noticed this!
Is there a way to enable these and is there any benefit to doing so?

controller: nVidia Corporation NV10 [GeForce 256 SDR] (rev 10) 
        (prog-if 00 [VGA])
        Subsystem: Elsa AG Erazor X
        Flags: bus master, 66MHz, medium devsel, latency 32, IRQ 10
        Memory at dc000000 (32-bit, non-prefetchable) [size=16M]
        Memory at d0000000 (32-bit, prefetchable) [size=128M]
***>Expansion ROM at dd000000 [disabled] [size=64K]  <*********************
        Capabilities: [60] Power Management version 1
        Capabilities: [44] AGP version 2.0

0000:00:0b.0 Ethernet controller: Intel Corporation 82557/8/9 [Ethernet Pro
100] (rev 05)
        Subsystem: Compaq Computer Corporation NC3121 Fast Ethernet NIC (WOL)
        Flags: bus master, medium devsel, latency 32, IRQ 11
        Memory at df100000 (32-bit, prefetchable) [size=4K]
        I/O ports at dc00 [size=32]
        Memory at df000000 (32-bit, non-prefetchable) [size=1M]
***>Expansion ROM at 20000000 [disabled] [size=1M] <**********************
        Capabilities: [dc] Power Management version 1
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