| Line 1... |
Line 1... |
/**
|
/**
|
* ion_noxram.lds -- Linker script file for ION project (with no RAM or cache)
|
* ion_noxram.lds -- Linker script file for ION project (with no RAM or cache)
|
*
|
*
|
|
* WARNING: This script is no longer used by any makefile, to be removed.
|
|
*
|
* The ion cpu has separate buses for code and data (Harvard architecture) but
|
* The ion cpu has separate buses for code and data (Harvard architecture) but
|
* does not have caches by default. This linker script targets that 'bare'
|
* does not have caches by default. This linker script targets that 'bare'
|
* system configuration. It is meant for early testing and debugging.
|
* system configuration. It is meant for early testing and debugging.
|
*
|
*
|
* This script will split the object file in two areas so that they can be put
|
* This script will split the object file in two areas so that they can be put
|
| Line 18... |
Line 20... |
* twice as many memory blocks for the same memory size).
|
* twice as many memory blocks for the same memory size).
|
*
|
*
|
* FIXME code and data RAM block sizes hardcoded
|
* FIXME code and data RAM block sizes hardcoded
|
* FIXME code and data start addresses hardcoded
|
* FIXME code and data start addresses hardcoded
|
*/
|
*/
|
|
/*
|
|
# Known problems:
|
|
#
|
|
# 1.- LINK PROBLEM IF FLAG '-G0' NOT USED
|
|
# If flag '-G0' is not used on gcc, linker fails with 'relocation
|
|
# truncated to fit: R_MIPS_GPREL16' error message.
|
|
# This only happens when you use global or static veriables, initialized
|
|
# or not.
|
|
# (See explaination in the project docs about $gp indexed addressing in
|
|
# MIPS architectures and the -G0 flag).
|
|
#
|
|
# SUSPECTED CAUSE:
|
|
# I'm sure there is something wrong with my linker script.
|
|
# With the default link scripts this does not happen. Yet we need to use
|
|
# a script so that we can split code and data (including read-only) to
|
|
# different sections (and later to different ram blocks).
|
|
#
|
|
# WORKAROUND:
|
|
# Use -G0 flag so that _gp indexing is disabled. There is a performance
|
|
# hit, though. In effect we're telling the compiler to NOT use $gp for
|
|
# indexed access to any global variables.
|
|
# This is only necessary for the 'bare' target (no external ram and no
|
|
# cache) and will have to be fixed for regular targets (by using a
|
|
# standard link script or fixing mine).
|
|
|
|
*/
|
|
|
|
|
/* Make sure the first linked file is ths startup code from boot.s */
|
/* Make sure the first linked file is ths startup code from boot.s */
|
/* (We might put boot.o in the ld command line, BEFORE all other files) */
|
/* (We might put boot.o in the ld command line, BEFORE all other files) */
|
STARTUP(boot.o)
|
STARTUP(boot.o)
|
|
|
