readme

PowerPC 74XX系列CPU的VxWorks BSP源代码！

README: Motorola Sandpoint X2/X3, sp74xx
 
This file contains information on any BSP interface changes from previous
software or hardware versions, and contains caveats that the user must be
aware of before using this BSP. Additionally, the target board's manual
page entry (for example, sp74xx/target.nr) provides board-specific
information necessary to run VxWorks, and should be read before this 
BSP is used.
 
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RELEASE 1.2/6
    First release for Tornado 2.2
    Add support for Sandpoint Valis (745x) and Gyrus (744x) boards
    This version is based on sp7400 Tornado 2.1 release
    This version contains modifications to Makefile, config.h, sp.h and sysLib.c. 
    Added support for Diab C/C++ tools. 

RELEASE 1.2/4
    This version contains support for MPC750.
    This version also contains support for the X3 version of the PPMC7400/7410 in
    the X2 (SP2) Mode for the base board.

RELEASE 1.2/3:

    This version contains support for cache locking and cache snooping.
    Added support for altivec for MPC7400.

RELEASE 1.2/2:

   This version contains support for L2 Cache, L2 Cache support is not
   available for sp8240 .

RELEASE 1.2/1:

   This is version contains minor modifications to Makefile, config.h,
   mpc107.h and sysLib.c to add support for other boards in the
   Sandpoint family.

RELEASE 1.2/0:

    First release for Tornado 2.0

KNOWN PROBLEMS:

PROBLEM# 1:
        Reading Device  and Vendor Ids from PCI IDSEL 12 may cause the
        system to hang.  A workaround solution is to skip this IDSEL
        when reading PCI devices.  Example:  

	for (idsel = 0; idsel < 32; idsel++)
	   if (idsel == 12) 
	      continue;
	   else
	     {
		.......
	     }

        Switch S6 in shared-slot 2 position does not appear to work if
        S3 & S4 are placed in MODE 0

        Slot numbers are incorrectly labelled in the documentation.
        The slot numbers from the PPMC outward are 2,1,4,3 respectively.

PROBLEM# 2: ( IDE-Reset ):

         When ATA-device used, the warm reset appears to hang the
         board, and the board has to be poewr-cycled.

PROBLEM-3 ( ISA-DMA ):

          In the users manual revision 1.01, dated 6/9/1999, Board
          revision Level X2, Errata Revision Level B, shows that 
          "The Winbond PCIRST signal conflicts with the PCIRST signal
          from the reset controller", due to thisreason ISA-DMA 
          does not seem to work. This problem will be fixed X3
          revision of the board.