Output of "Intel 82541PI Gigabit Ethernet Controller" (8086:107c, BDF 02:0a.0)
Notice, that "rom" is available here

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root@PC02:/sys/bus/pci/devices/0000:02:0a.0# ls -l
insgesamt 0
-rw-r--r-- 1 root root   4096 2013-01-26 15:34 broken_parity_status
-r--r--r-- 1 root root   4096 2013-01-26 13:29 class
-rw-r--r-- 1 root root    256 2013-01-26 13:29 config
-r--r--r-- 1 root root   4096 2013-01-26 15:34 consistent_dma_mask_bits
-r--r--r-- 1 root root   4096 2013-01-26 13:29 device
-r--r--r-- 1 root root   4096 2013-01-26 15:34 dma_mask_bits
lrwxrwxrwx 1 root root      0 2013-01-26 13:29 driver -> ../../../../bus/pci/drivers/e1000
-rw------- 1 root root   4096 2013-01-26 15:34 enable
-r--r--r-- 1 root root   4096 2013-01-26 13:29 irq
-r--r--r-- 1 root root   4096 2013-01-26 15:34 local_cpulist
-r--r--r-- 1 root root   4096 2013-01-26 13:29 local_cpus
-r--r--r-- 1 root root   4096 2013-01-26 15:34 modalias
-rw-r--r-- 1 root root   4096 2013-01-26 15:34 msi_bus
drwxr-xr-x 3 root root      0 2013-01-26 14:28 net
drwxr-xr-x 2 root root      0 2013-01-26 15:34 power
--w--w---- 1 root root   4096 2013-01-26 15:34 remove
--w--w---- 1 root root   4096 2013-01-26 15:34 rescan
--w------- 1 root root   4096 2013-01-26 15:34 reset
-r--r--r-- 1 root root   4096 2013-01-26 13:29 resource
-rw------- 1 root root 131072 2013-01-26 15:34 resource0
-rw------- 1 root root 131072 2013-01-26 15:34 resource1
-rw------- 1 root root     64 2013-01-26 15:34 resource2
-rw------- 1 root root 131072 2013-01-26 15:34 rom
lrwxrwxrwx 1 root root      0 2013-01-26 14:28 subsystem -> ../../../../bus/pci
-r--r--r-- 1 root root   4096 2013-01-26 15:34 subsystem_device
-r--r--r-- 1 root root   4096 2013-01-26 15:34 subsystem_vendor
-rw-r--r-- 1 root root   4096 2013-01-26 14:28 uevent
-r--r--r-- 1 root root   4096 2013-01-26 13:29 vendor
root@PC02:/sys/bus/pci/devices/0000:02:0a.0#