The RCW directories names for the LS1012A2G5RDB board conform to the following
naming convention:

a_bcde_f:

a = 'R' indicates RGMII
    'N' indicates not available/not used

b = What is available in SerDes1 Lane0
c = What is available in SerDes1 Lane1
d = What is available in SerDes1 Lane2
e = What is available in SerDes1 Lane2

For the Slots (c..j):
 'N' is NULL, not available/not used
 'P' is PCIe
 'S' is SGMII
 'H' is SATA

Serdes1 protocol (k):
f = 'hex value of serdes protocol value'

BIN   Core/Platform/DDR
Bin1: 800MHz/250MHz/1000MT/s

Files naming convention
=============================
rcw_x.rcw
rcw_x_bootmode.rcw
rcw_x_specialsetting.rcw
x = Core frequency
bootmode = bootmode:qspiboot and so on.
specialsetting = special setting:
                        sben:Secure boot
For example,
        rcw_1000.rcw means rcw for core frequency of 1000MHz.

For more information please refer to the comments in rcw file.