This file is indexed.

/lib/firmware/cis/src/PE520.cis is in linux-firmware 1.79.18.

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#
# Replacement CIS for LanPro EP-4000A ethernet card
#
vers_1 4.1, "KTI", "PE520 PLUS", "PCMCIA Ethernet"
manfid 0x0161, 0x0010
funcid network_adapter
config base 0x0fd0 mask 0x0b last_index 0x01
cftable_entry 0x01 [default]
  Vcc Vnom 5V
  irq mask 0xffff [level]
  io 0x0000-0x001f [8bit] [16bit]