Posted on June 16, 2014 at 11:22
Hello, I'm using ARM GCC and I'm trying to use linker script as below:
MEMORY
{
FLASH_ISR_TABLE (rx) : ORIGIN = 0x8000000, LENGTH = 16K
FLASH_DEV_DESC (rx) : ORIGIN = 0x8004000, LENGTH = 16K
FLASH (rx) : ORIGIN = 0x8008000, LENGTH = 1024K - 32k
CCMRAM (rwx) : ORIGIN = 0x10000000, LENGTH = 64K
RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 128K
}
SECTIONS
{
.isr_vector :
{
KEEP(*(.isr_vector))
} > FLASH_ISR_TABLE
.device_desc :{
KEEP(*(.device_descriptor))
} > FLASH_DEV_DESC
.text :
{
*(.text*)
KEEP(*(.init))
KEEP(*(.fini))
/* .ctors */
*crtbegin.o(.ctors)
*crtbegin?.o(.ctors)
*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
*(SORT(.ctors.*))
*(.ctors)
/* .dtors */
*crtbegin.o(.dtors)
*crtbegin?.o(.dtors)
*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
*(SORT(.dtors.*))
*(.dtors)
*(.rodata*)
KEEP(*(.eh_frame*))
} > FLASH
....
....
....
In the map file I look up the
__isr_vector
:.isr_vector 0x08000000 0x18c
*(.isr_vector)
.isr_vector 0x08000000 0x18c ./Src/startup_STM32F40XX.o
0x08000000 __isr_vector
.device_desc 0x08004000 0x18*(.device_descriptor)
.device_descriptor
0x08004000 0x18 ./Application/SKP4_revA_Main/SKP4_MainApp.o
.text 0x08008000 0x36678
*(.text*)
...
...
...
At this stage everything looked ok (at least for me:) ) But when I checked hex and bin file the __isr_vector was missing. (Output files started from string descriptor which I put in .device_descriptor section. This section start from address: 0x8004000)
When I modified
isr_vector section as follow:
.isr_vector :
{
KEEP(*(.isr_vector))
*(.text.SD*)
*(.text.*Handler)
}
> FLASH_ISR_TABLE
Problem disappear. Output files starts from ISR table as they should. And program runs under debugger without any problems.
Any ideas why linker is removing
isr_vector section even if its marked as
KEEP???
