This file is indexed.

/usr/share/yosys/xilinx/drams.txt is in yosys 0.7-2.

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

The actual contents of the file can be viewed below.

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bram $__XILINX_RAM64X1D
  init 1
  abits 6
  dbits 1
  groups 2
  ports  1 1
  wrmode 0 1
  enable 0 1
  transp 0 0
  clocks 0 1
  clkpol 0 2
endbram

bram $__XILINX_RAM128X1D
  init 1
  abits 7
  dbits 1
  groups 2
  ports  1 1
  wrmode 0 1
  enable 0 1
  transp 0 0
  clocks 0 1
  clkpol 0 2
endbram

match $__XILINX_RAM64X1D
  make_outreg
  or_next_if_better
endmatch

match $__XILINX_RAM128X1D
  make_outreg
endmatch