/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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | 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
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