bootinit.c

这是别人发的LPC2210的BSP

/* bootInit.c - ROM initialization module */

/* Copyright 1989-2002 Wind River Systems, Inc. */
#include "copyright_wrs.h"
#include "lpc2210.h"

/*
DESCRIPTION
This module provides a generic boot ROM facility.  The target-specific
romInit.s module performs the minimal preliminary board initialization and
then jumps to the C routine romStart().  This routine, still executing out
of ROM, copies the first stage of the startup code to a RAM address and
jumps to it.  The next stage clears memory and then uncompresses the
remainder of ROM into the final VxWorks ROM image in RAM.

A modified version of the Public Domain \f3zlib\fP library is used to
uncompress the VxWorks boot ROM executable linked with it.  Compressing
object code typically achieves over 55% compression, permitting much
larger systems to be burned into ROM.  The only expense is the added few
seconds delay while the first two stages complete.

ROM AND RAM MEMORY LAYOUT
Example memory layout for a 1-megabyte board:
.CS
    --------------  0x00100000 = LOCAL_MEM_SIZE = sysMemTop()
    |            |
    |    RAM     |
    |  0 filled  |
    |            |
    |------------| = (romInit+ROM_COPY_SIZE) or binArrayStart
    | ROM image  |
    |----------- |  0x00090000  = RAM_HIGH_ADRS
    | STACK_SAVE |
    |------------|
    |            |  0x00080000  = 0.5 Megabytes
    |            |
    |            |
    | 0 filled   |
    |            |
    |            |  0x00001000  = RAM_ADRS & RAM_LOW_ADRS
    |            |
    |            |  exc vectors, bp anchor, exc msg, bootline
    |            |
    |            |
    --------------  0x00000000  = LOCAL_MEM_LOCAL_ADRS
.CE
.CS
    --------------
    |    ROM     |
    |            |  0xff8xxxxx  = binArrayStart
    |            |
    |            |  0xff800008  = ROM_TEXT_ADRS
    --------------  0xff800000  = ROM_BASE_ADRS
.CE

SEE ALSO:
inflate(), romInit(), and deflate

AUTHOR
The original compression software for zlib was written by Jean-loup Gailly
and Mark Adler. See the manual pages of inflate and deflate for
more information on their freely available compression software.
*/

#include "vxWorks.h"
#include "sysLib.h"
#include "config.h"
#include "errno.h"
#include "sioLib.h"

#define	UNCMP_RTN	inflate

#ifndef USER_RESERVED_MEM
#define USER_RESERVED_MEM 0
#endif

/*
 * If memory is to be cleared, it will be cleared from SYS_MEM_BOTTOM
 * up to (but not including) SYS_MEM_TOP, except for text and data segments.
 * The user reserved area is not cleared.
 */

#define	SYS_MEM_TOP \
	(LOCAL_MEM_LOCAL_ADRS + LOCAL_MEM_SIZE - USER_RESERVED_MEM)

#define SYS_MEM_BOTTOM \
	(LOCAL_MEM_LOCAL_ADRS + RESERVED)

#define BINARRAYEND_ROUNDOFF	(ROUND_DOWN(binArrayEnd, sizeof(long))) 

IMPORT void	romInit ();
IMPORT STATUS	UNCMP_RTN ();
IMPORT void	usrInit ();
IMPORT void	sysInitAlt ();
IMPORT void	start ();

IMPORT UCHAR	binArrayStart [];	/* compressed binary image */
IMPORT UCHAR	binArrayEnd [];		/* end of compressed binary image */
IMPORT char	etext [];		/* defined by the loader */
IMPORT char	end [];			/* defined by the loader */
IMPORT UCHAR	wrs_kernel_data_start [];  /* defined by the loader */
IMPORT UCHAR	wrs_kernel_data_end [];    /* defined by the loader */

#define	RESIDENT_DATA 	wrs_kernel_data_start	

#ifndef RAM_DST_ADRS                	/* default uncompress dest. */
#define RAM_DST_ADRS        RAM_HIGH_ADRS
#endif

/* #if	defined (UNCOMPRESS) || defined (ROM_RESIDENT) */
#ifndef ROM_COPY_SIZE
#define	ROM_COPY_SIZE	(ROM_SIZE - (ROM_TEXT_ADRS - ROM_BASE_ADRS))
#endif
/* #endif*/	/* UNCOMPRESS */

#define ROM_OFFSET(adr)	(((UINT)adr - (UINT)romInit) + ROM_TEXT_ADRS)

/* forward declarations */

LOCAL void copyLongs (FAST UINT *source, FAST UINT *destination, UINT nlongs);
LOCAL void fillLongs (FAST UINT *buf, UINT nlongs, FAST UINT val);

void lpc2210Init(void)
{
/* 设置系统各部分时钟 */
/* Set system timers for each component */
    PLLCON = 1;
#if (Fpclk / (Fcclk / 4)) == 1
    VPBDIV = 0;
#endif
#if (Fpclk / (Fcclk / 4)) == 2
    VPBDIV = 2;
#endif
#if (Fpclk / (Fcclk / 4)) == 4
    VPBDIV = 1;
#endif

#if (Fcco / Fcclk) == 2
    PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);
#endif
#if (Fcco / Fcclk) == 4
    PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);
#endif
#if (Fcco / Fcclk) == 8
    PLLCFG = ((Fcclk / Fosc) - 1) | (2 << 5);
#endif
#if (Fcco / Fcclk) == 16
    PLLCFG = ((Fcclk / Fosc) - 1) | (3 << 5);
#endif
    PLLFEED = 0xaa;
    PLLFEED = 0x55;
    while((PLLSTAT & (1 << 10)) == 0);
    PLLCON = 3;
    PLLFEED = 0xaa;
    PLLFEED = 0x55;
    
    /* 设置存储器加速模块 */
    /* Set memory accelerater module*/
    MAMCR = 0;
#if Fcclk < 20000000
    MAMTIM = 1;
#else
#if Fcclk < 40000000
    MAMTIM = 2;
#else
    MAMTIM = 3;
#endif
#endif
    MAMCR = 2;
}

/*******************************************************************************
*
* romStart - generic ROM initialization
*
* This is the first C code executed after reset.
*
* This routine is called by the assembly start-up code in romInit().
* It clears memory, copies ROM to RAM, and possibly invokes the uncompressor.
* It then jumps to the entry point of the uncompressed object code.
*
* RETURNS: N/A
*/

void romStart
    (
    FAST int startType		/* start type */
    )
{
    volatile FUNCPTR absEntry;		/* to avoid PC Relative Jump Subroutine */

     /* The link.ROM is not correct, so currently there is no need to copy data segment to 
     0x80204000. They have already been there! */
#if 0
    copyLongs ((UINT *)etext, (UINT *) RESIDENT_DATA,
        ((UINT) wrs_kernel_data_end - (UINT) RESIDENT_DATA) / sizeof (long));
#endif
    /* clear all memory if cold booting */

    lpc2210Init();

    if (startType & BOOT_CLEAR)
    {
	/* Clear memory not loaded with text & data.
	 *
	 * We are careful about initializing all memory (except
	 * STACK_SAVE bytes) due to parity error generation (on
	 * some hardware) at a later stage.  This is usually
	 * caused by read accesses without initialization.
	 */
	fillLongs ((UINT *)SYS_MEM_BOTTOM,
		((UINT) RESIDENT_DATA - STACK_SAVE - (UINT)SYS_MEM_BOTTOM)
		/ sizeof(long), 0);
	fillLongs (((UINT *) wrs_kernel_data_end),
	((UINT)SYS_MEM_TOP - ((UINT) wrs_kernel_data_end)) / sizeof(long), 0);

	/* 
	 * Ensure the boot line is null. This is necessary for those
	 * targets whose boot line is excluded from cleaning.
	 */
	*(BOOT_LINE_ADRS) = EOS;
    }

    /* jump to VxWorks entry point (after uncompressing) */

    absEntry = (FUNCPTR)usrInit;			/* on to bootConfig */

    (absEntry) (startType);
}

/*******************************************************************************
*
* copyLongs - copy one buffer to another a long at a time
*
* This routine copies the first <nlongs> longs from <source> to <destination>.
*/

LOCAL void copyLongs (source, destination, nlongs)
    FAST UINT *source;		/* pointer to source buffer      */
    FAST UINT *destination;	/* pointer to destination buffer */
    UINT nlongs;		/* number of longs to copy       */
{
    FAST UINT *dstend = destination + nlongs;
    FAST UINT nchunks;

    /* Hop by chunks of longs, for speed. */
    for (nchunks = nlongs / 8; nchunks; --nchunks)
    {
	destination[0] = source[0];
	destination[1] = source[1];
	destination[2] = source[2];
	destination[3] = source[3];
	destination[4] = source[4];
	destination[5] = source[5];
	destination[6] = source[6];
	destination[7] = source[7];
	destination += 8, source += 8;
    }

    /* Do the remainder one long at a time. */
    while (destination < dstend)
	*destination++ = *source++;
}

/*******************************************************************************
*
* fillLongs - fill a buffer with a value a long at a time
*
* This routine fills the first <nlongs> longs of the buffer with <val>.
*/

LOCAL void fillLongs (buf, nlongs, val)
    FAST UINT *buf;	/* pointer to buffer              */
    UINT nlongs;	/* number of longs to fill        */
    FAST UINT val;	/* char with which to fill buffer */
{
    FAST UINT *bufend = buf + nlongs;
    FAST UINT nchunks;

    /* Hop by chunks of longs, for speed. */
    for (nchunks = nlongs / 8; nchunks; --nchunks)
    {
        buf[0] = val;
        buf[1] = val;
        buf[2] = val;
        buf[3] = val;
        buf[4] = val;
        buf[5] = val;
        buf[6] = val;
        buf[7] = val;
        buf += 8;
    }

    /* Do the remainder one long at a time. */
    while (buf < bufend)
	*buf++ = val;
}