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-Overview
---------
-P1_P2_RDB_PC represents a set of boards including
-    P1020MSBG-PC
-    P1020RDB-PC
-    P1020UTM-PC
-    P1021RDB-PC
-    P1024RDB
-    P1025RDB
-    P2020RDB-PC
-
-They have similar design of P1020RDB but have DDR3 instead of DDR2. P2020RDB-PC
-has 64-bit DDR. All others have 32-bit DDR.
-
-Key features on these boards include:
-    * DDR3
-    * NOR flash
-    * NAND flash (on RDB's only)
-    * SPI flash (on RDB's only)
-    * SDHC/MMC card slot
-    * VSC7385 Ethernet switch (on P1020MBG, P1020RDB, & P1021RDB)
-    * PCIE slot and mini-PCIE slots
-
-As these boards use soldered DDR chips not regular DIMMs, an on-board EEPROM
-is used to store SPD data. In case of absent or corrupted SPD, falling back
-to timing data embedded in the source code will be used. Raw timing data is
-extracted from DDR chip datasheet. Different speeds of DDR are supported with
-this approach. ODT option is forced to fit this set of boards, again because
-they don't have regular DIMMs.
-
-CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS is defined as 5ms to meet specification
-for writing timing.
-
-VSC firmware Address is defined by default in config file for eTSEC1.
-
-SD width is based off DIP switch. DIP switch is detected on the
-board by reading i2c bus and setting the appropriate mux values.
-
-Some boards have QE module in the silicon (P1021 and P1025). QE and eLBC have
-pins multiplexing. QE function needs to be disabled to access Nor Flash and
-CPLD. QE-UEC and QE-UART can be enabled for linux kernel by setting "qe"
-in hwconfig. In addition, QE-UEC and QE-TDM also have pins multiplexing, to
-enable QE-TDM for linux kernel, set "qe;tdm" in hwconfig. Syntax is as below
-
-'setenv hwconfig qe' to enable QE UEC/UART and disable Nor-Flash/CPLD.
-'setenv hwconfig 'qe;tdm'' to enalbe QE TDM and disable Nor-Flash/CPLD.