readme

VxWorks的bootloader实现

README: Motorola Sandpoint X2, sp824x
 
This file contains board-specific information for the Motorola Sandpoing X2/X3
BSP, sp824x for PPMC8240/8245.

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, sp824x/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

    This version is based on sp824x for Tornado 2.0.2 release.
    This version contains modifications to Makefile, config.h, sp.h and sysLib.c.
    Added support for Diab C/C++ tools.

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 this reason ISA-DMA 
          does not seem to work. This problem will be fixed at X3
          revision of the board.