Hello ,
I am new to GNU compiler.
I have a C source code file which contains some structures and variables in which I need to place certain variables at a particular locations.
So, I have written a linker script file and used the __ attribute__("SECTION") at variable declaration, in C source code.
I am using a GNU compiler (cygwin) to compile the source code and creating a .hex file using -objcopy option, but I am not getting how to link my linker script file at compilation to relocate the variables accordingly.
I am attaching the linker script file and the C source file for the reference.
Please help me link the linker script file to my source code, while creating the .hex file using GNU.
/*linker script file*/
/*defining memory regions*/
MEMORY
{
base_table_ram : org = 0x00700000, len = 0x00000100 /*base table area for BASE table*/
mem2 : org =0x00800200, len = 0x00000300 /* other structure variables*/
}
/*Sections directive definitions*/
SECTIONS
{
BASE_TABLE : { } > base_table_ram
GROUP :
{
.text : { } { *(SEG_HEADER) }
.data : { } { *(SEG_HEADER) }
.bss : { } { *(SEG_HEADER) }
} > mem2
}
C source code:
const UINT8 un8_Offset_1 __attribute__((section("BASE_TABLE"))) = 0x1A;
const UINT8 un8_Offset_2 __attribute__((section("BASE_TABLE"))) = 0x2A;
const UINT8 un8_Offset_3 __attribute__((section("BASE_TABLE"))) = 0x3A;
const UINT8 un8_Offset_4 __attribute__((section("BASE_TABLE"))) = 0x4A;
const UINT8 un8_Offset_5 __attribute__((section("BASE_TABLE"))) = 0x5A;
const UINT8 un8_Offset_6 __attribute__((section("SEG_HEADER"))) = 0x6A;
My intention is to place the variables of section "BASE_TABLE" at the address defined i the linker script file and the remaining variables at the "SEG_HEADER" defined in the linker script file above.
But after compilation when I look in to the .hex file the different section variables are located in different hex records, located at an address of 0x00, not the one given in linker script file .
Please help me in linking the linker script file to source code.
Are there any command line options to link the linker script file, if any plese provide me with the info how to use the options.
Thanks in advance,
SureshDN.
