Hi
Thanks in advance for reading my post.
I am doing a project with a platform without any flash memory. This
platform has the AM3517 processor. Before using this platform, I
simulate it on craneboard. What I did is that I locate all sections to
ram, Here is my linker scriptfile.
/*******************************************************************************
**
** Sample linker definition file for NP30.
**
********************************************************************************
*/
EXTERN(_start)
ENTRY(_start)
MEMORY
{
vectors : org = 0x4020ffc4, len = 0x003C
intram : org = 0x40200040, len = 0x3800
sdram : org = 0x80000000, len = 0x100000
}
SECTIONS
{
.boot : { __BOOT_START = .; *(.boot) __BOOT_END = .; . =
ALIGN( 4 ); }> vectors
.startup : { __BOOT_START = .; *(.boot) __BOOT_END = .; . =
ALIGN( 4 ); } > intram
.text : { __TEXT_START = .; *(.text) __TEXT_END = .; . =
ALIGN( 4 ); } > sdram
.rdata : { __RDATA_START = .; *(.rodata) *(.rodata.str1.2)
*(.rodata.str1.4) *(.rdata_4) *(.rdata_2) *(.rdata_1) __RDATA_END = .; .
= ALIGN( 4 ); } > sdram
.data : { __DATA_START = .; *(.data_4) *(.data_2)
*(.data_1) *(.data) __DATA_END = .; . = ALIGN( 4 ); } > sdram
.bss (NOLOAD) : { __BSS_START = .; *(.bss_4) *(.bss_2) *(.bss_1)
*(.bss) *(COMMON) __BSS_END = .; . = ALIGN( 16384 ); } > sdram
.mmutable (NOLOAD): { __MMUTABLE_END = .; . += 0x4000;
__MMUTABLE_START = .; . = ALIGN( 16384 ); } > sdram
.sysstack : { __SYSSTACK_END = .; . += 0x200;
__SYSSTACK_START = .; . = ALIGN( 4 ); } > intram
.irqstack : { __IRQSTACK_END = .; . += 0xE0; __IRQSTACK_START
= .; . = ALIGN( 4 ); } > intram
.fiqstack : { __FIQSTACK_END = .; . += 0x80; __FIQSTACK_START
= .; . = ALIGN( 4 ); } > intram
.abtstack : { __ABTSTACK_END = .; . += 0x80; __ABTSTACK_START
= .; . = ALIGN( 4 ); } > intram
.svcstack : { __SVCSTACK_END = .; . += 0x80; __SVCSTACK_START
= .; . = ALIGN( 4 ); } > intram
.undstack : { __UNDSTACK_END = .; . += 0x80; __UNDSTACK_START
= .; . = ALIGN( 4 ); } > intram
}
However, in the map file, I found that section
.debug_*,.comment,.attributes are still located to the address which
starts with 0x00000000, and this is the address where the flash is
mapped. I add three lines in order to relocate these sections since
I don't want any data locate to the flash(the project platform doesn't have any flash mapped):
.comment : { *(.comment) ; . = ALIGN( 4 ); } > sdram
.attributes : { *(.ARM.attributes) ; . = ALIGN( 4 ); } > sdram
.debug : { *(.debug*) ; . = ALIGN( 4 ); } > sdram
and I Checked the .out file using "file" command, it says "Reading
symbols from XXX.out, <no debugging symbols found>....done". why the symbols lost?
I find a solution for debugging the RAM application,
it is illustrated in the article
http://gnuarm.alexthegeek.com/atmel/Using_Open_Source_Tools_for_AT91SAM7S_Cross_Development_revision_C.pdf
"Using Open Source Tools for AT91SAM7S Cross Development Revision C", page 180.
The author recommends to remap the memory address, is this the only solution?
How can I remap the memory address of AM3517?
Can someone give me a hand? Thanks
