Home | History | Annotate | Download | only in dbau1x00 
      1 By Thomas.Lange (a] corelatus.se 2004-Oct-05
      2 ----------------------------------------
      3 DbAu1xx0 are development boards from AMD containing
      4 an Alchemy AU1xx0 series cpu with mips32 core.
      5 Existing cpu:s are Au1000, Au1100, Au1500 and Au1550
      6 
      7 Limitations & comments
      8 ----------------------
      9 Support was originally big endian only.
     10 I have not tested, but several u-boot users report working
     11 configurations in little endian mode.
     12 
     13 I named the board dbau1x00, to allow
     14 support for all three development boards
     15 ( dbau1000, dbau1100 and dbau1500 ).
     16 Now there is a new board called dbau1550 also, which
     17 should be supported RSN.
     18 
     19 I only have a dbau1000, so my testing is limited
     20 to this board.
     21 
     22 The board has two different flash banks, that can
     23 be selected via dip switch. This makes it possible
     24 to test new bootloaders without thrashing the YAMON
     25 boot loader delivered with board.
     26 
     27 NOTE! When you switch between the two boot flashes, the
     28 base addresses will be swapped.
     29 Have this in mind when you compile u-boot. CONFIG_SYS_TEXT_BASE has
     30 to match the address where u-boot is located when you
     31 actually launch.
     32 
     33 Ethernet only supported for mac0.
     34 
     35 PCMCIA only supported for slot 0, only 3.3V.
     36 
     37 PCMCIA IDE tested with Sandisk Compact Flash and
     38 IBM microdrive.
     39 
     40 ###################################
     41 ########     NOTE!!!!!!   #########
     42 ###################################
     43 If you partition a disk on another system (e.g. laptop),
     44 all bytes will be swapped on 16bit level when using
     45 PCMCIA and running cpu in big endian mode!!!!
     46 
     47 This is probably due to an error in Au1000 chip.
     48 
     49 Solution:
     50 
     51 a) Boot via network and partition disk directly from
     52 dbau1x00. The endian will then be correct.
     53 
     54 b) Partition disk on "laptop" and fill it with all files
     55 you need. Then write a simple program that endian swaps
     56 whole disk,
     57 
     58 Example:
     59 Original "laptop" byte order:
     60 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9...
     61 
     62 Dbau1000 byte order will then be:
     63 B1 B0 B3 B2 B5 B4 B7 B6 B9 B8...
     64