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/*
* 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 PROM version.
* 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
*
* $Id$
*/
/*
* 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
myram : ORIGIN = 4M-512k, LENGTH = 512k
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 : AT (0x00000000) {
CREATE_OBJECT_SYMBOLS
*(.text)
. = ALIGN (16);
etext = .;
_etext = .;
} >rom
.data : AT(SIZEOF(.text)) {
copy_start = .;
*(.data)
. = ALIGN (16);
_edata = .;
copy_end = .;
} >myram
.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 = .;
} >myram
/*
* On-chip memory/peripherals
*/
dpram : {
m360 = .;
_m360 = .;
. += (8 * 1024);
} >dpram
}
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