/*
 * This file contains GNU linker directives for a generic MC68360 board.
 * Variations in hardware type and dynamic memory size can be made
 * by overriding some values with linker command-line arguments.
 *
 * These linker directives are for producing a BOOTP PROM.
 * To create the PROM image from the linker output you must use objcopy
 * (--adjust-section-vma) to place the data segment at the end of the text
 * segment in the PROM.  The start-up code takes care of copying this region
 * to RAM.
 *
 * Saskatchewan Accelerator Laboratory
 * University of Saskatchewan
 * Saskatoon, Saskatchewan, CANADA
 * eric@skatter.usask.ca
 * 
 *  $Id$
 */

/*
 * a.out format doesn't handle prom images very well
 */
OUTPUT_FORMAT(coff-m68k)

/*
 * Declare some sizes.
 * XXX: The assignment of ". += XyzSize;" fails in older gld's if the
 *      number used there is not constant.  If this happens to you, edit
 *      the lines marked XXX below to use a constant value.
 */
RamSize = DEFINED(RamSize) ? RamSize : 4M;
HeapSize = DEFINED(HeapSize) ? HeapSize : 0x10000;
StackSize = DEFINED(StackSize) ? StackSize : 0x1000;

/*
 * Declare hardware type
 */
MC68360HardwareTypeMotorolaGeneric = 0; 
MC68360HardwareTypeAtlasHSB = 1; 
MC68360HardwareType = DEFINED(MC68360HardwareType) ? MC68360HardwareType : 0;

/*
 * Declare on-board memory.
 * It would be nice if the ram length could be given as
 * LENGTH=RamSize, but gld doesn't allow non-constant
 * values in the LENGTH expression.  
 */
MEMORY {
          ram : ORIGIN = 0x00000000, LENGTH = 64M
          rom : ORIGIN = 0xFF000000, LENGTH = 1M
        dpram : ORIGIN = 0xFE000000, LENGTH = 8k
}

/*
 * Declare low-order three octets of Ethernet address.
 */
ETHERNET_ADDRESS = DEFINED(ETHERNET_ADDRESS) ? ETHERNET_ADDRESS : 0xDEAD12;

/*
 * Declare hardware type.
 * Acceptable values are:
 *	0 - Generic system as described in the MC68360 User's Manual
 *	    (MC68360UM/AD Rev. 1).
 *	1 - ATLAS Computer Equipment Incorporated ACE360/HSB.
 */
MC68360HardwareType = DEFINED(MC68360HardwareType) ? MC68360HardwareType : 0;

/*
 * Load objects
 */
SECTIONS {
	/*
	 * Hardware variations
	 */
	_RamSize = RamSize;
	__RamSize = RamSize;
	_MC68360HardwareType = MC68360HardwareType;
	__MC68360HardwareType = MC68360HardwareType;
	_MC68360HardwareTypeMotorolaGeneric = MC68360HardwareTypeMotorolaGeneric; 
	__MC68360HardwareTypeMotorolaGeneric = MC68360HardwareTypeMotorolaGeneric; 
	_MC68360HardwareTypeAtlasHSB = MC68360HardwareTypeAtlasHSB; 
	__MC68360HardwareTypeAtlasHSB = MC68360HardwareTypeAtlasHSB; 

        /*
         * Boot PROM
         */
        rom : {
                _RomBase = .;
                __RomBase = .;
        } >rom

        /*
         * Dynamic RAM
         */
        ram : {
                _RamBase = .;
                __RamBase = .;
        } >ram

        /*
         * Text, data and bss segments
         */
        .text : {
                CREATE_OBJECT_SYMBOLS
                *(.text)
                . = ALIGN (16);
                etext = .;
                _etext = .;
        } >rom 
        .data : {
                copy_start = .;
                *(.data)
                . = ALIGN (16);
                _edata = .;
                copy_end = .;
        } >ram
        .bss : {
                M68Kvec = .;
                _M68Kvec = .;
                . += (256 * 4);
                clear_start = .;
                *(.bss)
                *(COMMON)
                . = ALIGN (16);
                _end = .;

                _HeapStart = .;
                __HeapStart = .;
                . += HeapSize;  /* XXX -- Old gld can't handle this */
                . += StackSize; /* XXX -- Old gld can't handle this */
                /* . += 0x10000; */ /* HeapSize for old gld */
                /* . += 0x1000;  */ /* StackSize for old gld */
                . = ALIGN (16);
                stack_init = .;
                clear_end = .;

                _WorkspaceBase = .;
                __WorkspaceBase = .;
        } >ram

        /*
         * On-chip memory/peripherals
         */
        dpram : {
                m360 = .;
                _m360 = .;
                . += (8 * 1024);

        } >dpram
}