I am using Codewarrior 6.4 for Coldfire (MFC52211) and I'd like to add a command to the linker control file to fill unused FLASH memory locations with a default value. It appears that there is some syntax for this specified in the build tools manual, but I could use a short example to see how its implemented.
Below is the sample lcf file that I have been messing about with if someone wants a starting point.
Thanks!
# Sample Linker Command File for CodeWarrior for ColdFire
# Memory ranges
MEMORY {
vectorrom (RX) : ORIGIN = 0x00000000, LENGTH = 0x00000420
code (RX) : ORIGIN = 0x00000420, LENGTH = 0x0001FBE0u
# vectorram (RWX) : ORIGIN = 0x20000000, LENGTH = 0x00000400
# userram (RWX) : ORIGIN = 0x20000400, LENGTH = 0x00003C00
userram (RWX) : ORIGIN = 0x20000000, LENGTH = 0x00003FFF
}
FORCE_ACTIVE { VECTOR_TABLE }
SECTIONS {
# Heap and Stack sizes defilcfnition
# ___heap_size = 0x0000;
___stack_size = 0x1000;
# MCF52211 Derivative Memory map definitions from linker command files:
# __IPSBAR, __RAMBAR, __RAMBAR_SIZE, __FLASHBAR, __FLASHBAR_SIZE linker
# symbols must be defined in the linker command file.
# Memory Mapped Registers (IPSBAR= 0x40000000)
___IPSBAR = 0x40000000;
# 16 Kbytes Internal SRAM
___RAMBAR = 0x20000000;
___RAMBAR_SIZE = 0x00004000;
# 128 KByte Internal Flash Memory
___FLASHBAR = 0x00000000;
___FLASHBAR_SIZE = 0x00020000;
.userram : {} > userram
.code : {} > code
# .vectorram : {} > vectorram
.vectorrom : {} > vectorrom
.vectors :
{
mcf5xxx_vectors.s (.text)
. = ALIGN (0x4);
} >> vectorrom
.text :
{
*(.text)
. = ALIGN (0x4);
*(.rodata)
. = ALIGN (0x4);
___ROM_AT = .;
___DATA_ROM = .;
} >> code
.data : AT(___ROM_AT)
{
___DATA_RAM = .;
. = ALIGN(0x4);
# *(.exception)
# . = ALIGN(0x4);
# __exception_table_start__ = .;
# EXCEPTION
# __exception_table_end__ = .;
# ___sinit__ = .;
# STATICINIT
# __START_DATA = .;
*(.data)
. = ALIGN (0x4);
__END_DATA = .;
__START_SDATA = .;
*(.sdata)
. = ALIGN (0x4);
__END_SDATA = .;
___DATA_END = .;
__SDA_BASE = .;
. = ALIGN (0x4);
} >> userram
.bss :
{
___BSS_START = .;
__START_SBSS = .;
*(.sbss)
. = ALIGN (0x4);
*(SCOMMON)
__END_SBSS = .;
__START_BSS = .;
*(.bss)
. = ALIGN (0x4);
*(COMMON)
__END_BSS = .;
___BSS_END = .;
. = ALIGN(0x4);
} >> userram
.custom :
{
___SP_END = .;
# ___HEAP_START = .;
# ___heap_addr = ___HEAP_START;
# ___HEAP_END = ___HEAP_START + ___heap_size;
# ___SP_END = ___HEAP_END;
___SP_INIT = ___SP_END + ___stack_size;
. = ALIGN (0x4);
} >> userram
# ___VECTOR_RAM = ADDR(.vectorram);
__SP_INIT = ___SP_INIT;
_romp_at = ___ROM_AT + SIZEOF(.data);
.romp : AT(_romp_at)
{
__S_romp = _romp_at;
WRITEW(___ROM_AT);
WRITEW(ADDR(.data));
WRITEW(SIZEOF(.data));
WRITEW(0);
WRITEW(0);
WRITEW(0);
}
}
