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README

      1 Wind River SBC8641D reference board
      2 ===========================
      3 
      4 Created 06/14/2007 Joe Hamman
      5 Copyright 2007, Embedded Specialties, Inc.
      6 Copyright 2007 Wind River Systems, Inc.
      7 -----------------------------
      8 
      9 1. Building U-Boot
     10 ------------------
     11 The SBC8641D code is known to build using ELDK 4.1.
     12 
     13     $ make sbc8641d_config
     14     Configuring for sbc8641d board...
     15 
     16     $ make
     17 
     18 
     19 2. Switch and Jumper Settings
     20 -----------------------------
     21 All Jumpers & Switches are in their default positions.  Please refer to
     22 the board documentation for details.  Some settings control CPU voltages
     23 and settings may change with board revisions.
     24 
     25 3. Known limitations
     26 --------------------
     27 PCI:
     28 	The PCI command may hang if no boards are present in either slot.
     29 
     30 4. Reflashing U-Boot
     31 --------------------
     32 The board has two independent flash devices which can be used for dual
     33 booting, or for U-Boot backup and recovery.  A two pin jumper on the
     34 three pin JP10 determines which device is attached to /CS0 line.
     35 
     36 Assuming one device has a functional U-Boot, and the other device has
     37 a recently installed non-functional image, to perform a recovery from
     38 that non-functional image goes essentially as follows:
     39 
     40 a) power down the board and jumper JP10 to select the functional image.
     41 b) power on the board and let it get to U-Boot prompt.
     42 c) while on, using static precautions, move JP10 back to the failed image.
     43 d) use "md fff00000" to confirm you are looking at the failed image
     44 e) turn off write protect with "prot off all"
     45 f) get new image, i.e. "tftp 200000 /somepath/u-boot.bin"
     46 g) erase failed image: "erase FFF00000 FFF5FFFF"
     47 h) copy in new image: "cp.b 200000 FFF00000 60000"
     48 i) ensure new image is written: "md fff00000"
     49 k) power cycle the board and confirm new image works.
     50