This file is indexed.

/lib/firmware/cis/src/tamarack.cis is in linux-firmware 1.157.

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

The actual contents of the file can be viewed below.

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#
# Replacement CIS for Surecom, Tamarack NE2000 cards
#
dev_info
  fn_specific 100ns, 512b
attr_dev_info
  EEPROM 250ns, 512b
vers_1 4.1, "TAMARACK", "Ethernet", "A", "004743118001"
funcid network_adapter
config base 0x03f8 mask 0x0003 last_index 0x20
cftable_entry 0x20 [default]
  [mwait]
  Vcc Vnom 5V Vmin 4500mV Vmax 5500mV Istatic 100mA
    Iavg 170mA Ipeak 200mA
  timing wait 15us
  io 0x0000-0x000f, 0x0010-0x001f [lines=5] [8bit] [16bit]
  irq mask 0xffff [level]