1702e6014SWolfgang DenkOverview
2702e6014SWolfgang Denk--------
3702e6014SWolfgang DenkP1_P2_RDB_PC represents a set of boards including
4702e6014SWolfgang Denk    P1020MSBG-PC
5702e6014SWolfgang Denk    P1020RDB-PC
6*45fdb627SHaijun.Zhang    P1020RDB-PD
7702e6014SWolfgang Denk    P1020UTM-PC
8702e6014SWolfgang Denk    P1021RDB-PC
9702e6014SWolfgang Denk    P1024RDB
10702e6014SWolfgang Denk    P1025RDB
11702e6014SWolfgang Denk    P2020RDB-PC
12702e6014SWolfgang Denk
13702e6014SWolfgang DenkThey have similar design of P1020RDB but have DDR3 instead of DDR2. P2020RDB-PC
14702e6014SWolfgang Denkhas 64-bit DDR. All others have 32-bit DDR.
15702e6014SWolfgang Denk
16702e6014SWolfgang DenkKey features on these boards include:
17702e6014SWolfgang Denk    * DDR3
18702e6014SWolfgang Denk    * NOR flash
19702e6014SWolfgang Denk    * NAND flash (on RDB's only)
20702e6014SWolfgang Denk    * SPI flash (on RDB's only)
21702e6014SWolfgang Denk    * SDHC/MMC card slot
22702e6014SWolfgang Denk    * VSC7385 Ethernet switch (on P1020MBG, P1020RDB, & P1021RDB)
23702e6014SWolfgang Denk    * PCIE slot and mini-PCIE slots
24702e6014SWolfgang Denk
25702e6014SWolfgang DenkAs these boards use soldered DDR chips not regular DIMMs, an on-board EEPROM
26702e6014SWolfgang Denkis used to store SPD data. In case of absent or corrupted SPD, falling back
27702e6014SWolfgang Denkto timing data embedded in the source code will be used. Raw timing data is
28702e6014SWolfgang Denkextracted from DDR chip datasheet. Different speeds of DDR are supported with
29702e6014SWolfgang Denkthis approach. ODT option is forced to fit this set of boards, again because
30702e6014SWolfgang Denkthey don't have regular DIMMs.
31702e6014SWolfgang Denk
32702e6014SWolfgang DenkCONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS is defined as 5ms to meet specification
33702e6014SWolfgang Denkfor writing timing.
34702e6014SWolfgang Denk
35702e6014SWolfgang DenkVSC firmware Address is defined by default in config file for eTSEC1.
36702e6014SWolfgang Denk
37702e6014SWolfgang DenkSD width is based off DIP switch. DIP switch is detected on the
38702e6014SWolfgang Denkboard by reading i2c bus and setting the appropriate mux values.
39702e6014SWolfgang Denk
40702e6014SWolfgang DenkSome boards have QE module in the silicon (P1021 and P1025). QE and eLBC have
41702e6014SWolfgang Denkpins multiplexing. QE function needs to be disabled to access Nor Flash and
42702e6014SWolfgang DenkCPLD. QE-UEC and QE-UART can be enabled for linux kernel by setting "qe"
43702e6014SWolfgang Denkin hwconfig. In addition, QE-UEC and QE-TDM also have pins multiplexing, to
44702e6014SWolfgang Denkenable QE-TDM for linux kernel, set "qe;tdm" in hwconfig. Syntax is as below
45702e6014SWolfgang Denk
46702e6014SWolfgang Denk'setenv hwconfig qe' to enable QE UEC/UART and disable Nor-Flash/CPLD.
47702e6014SWolfgang Denk'setenv hwconfig 'qe;tdm'' to enalbe QE TDM and disable Nor-Flash/CPLD.
48