System Workbench for STM32

I solved my own issue using a previous post on the forum:

here is a solution:
linker script:

region definitions:

RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 96K
RAM_2 (xrw) : ORIGIN = 0x10000000, LENGTH = 32K

in section definitions:

.ram2_bss :
{
. = ALIGN(4);
*(.ram2_bss)
*(.ram2_bss*)

} >RAM_2

C source code:
static uint8_t attribute ((section (".ram2_bss"), used)) ucHeapconfigTOTAL_HEAP_SIZE;

regards,
Sylvain