To move BSS the linker script needs modified and then given the address of SRAM1.
I don't use MCUXPresso so I can not help with that.
There may be someplace in there already that will simply assign the BSS address.
Failing that, I do know someplace there will be a .ld file that is currently being used.
Find that .ld file, make a copy, change MCUXpresso to use the new file.
Look for this section and modify accordingly.
It may be a simple as changing the final SRAM to SRAM1 as shown here:
SRAM and SRAM1 will be giving addresses at the top of the linker file in the section called MEMORY.
What you start with my not have the SORT_BY directives, feel free to add them.
/* Uninitialized data section */
. = ALIGN(4); /* Align the .bss output section */
/*
* SORT_BY_ALIGNMENT is very similar to SORT_BY_NAME. The
* difference is SORT_BY_ALIGNMENT will sort sections into descending
* order by alignment before placing them in the output file. Larger
* alignments are placed before smaller alignments in order to reduce
* the amount of padding necessary.
*/
.bss :
{
__bss_start__ = .; /* Standard newlib definition */
*(.bss)
*(SORT_BY_ALIGNMENT(.bss*)) /* Sort the input sections from largest alignment to the smallest */
/*
* A special notation is needed for common symbols, because in many
* object file formats common symbols do not have a particular input
* section. The linker treats common symbols as though they are in an
* input section named COMMON.
*/
*(COMMON)
. = ALIGN(4);
__bss_end__ = .; /* Standard newlib definition */
} > SRAM1
__bss_size__ = (__bss_end__ - __bss_start__);
