This file is indexed.

/lib/firmware/cis/src/DP83903.cis is in linux-firmware 1.79.18.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# This CIS is for cards based on the National Semiconductor
# DP83903 Multiple Function Interface Chip
#
vers_1 4.1, "Multifunction Card", "", "", "NSC MF LAN/Modem"
manfid 0x0175, 0x0000
funcid 0

mfc {
  funcid network_adapter
  config base 0x1020 mask 0x277 last_index 0x17
  cftable_entry 0x17
    Vcc Vnom 5V
    irq mask 0xffff [level]
    io  0x0000-0x001f [8bit] [16bit]
    memory 0x0000-0x3fff @ 0x0000
}, {
  funcid serial_port
  config base 0x1040 mask 0x0277 last_index 0x07
  cftable_entry 0x07
    Vcc Vnom 5V
    irq mask 0xffff [level]
    io  0x0000-0x0007 [8bit]
}