How to allocate a thread stack in different RAM section?

[vChavezB]

By default I think all stacks defined by K_THREAD_STACK_DEFINE are allocated in the default RAM section.

I see in the final linker and map file that these objects are allocated in k_stack_area.

Use case: I have some stacks which I would want to allocate in other SRAM regions as I do not have enough space in the main SRAM.

I am already using zephyr_code_relocate in my CMakeLists but as the stack is defined with the K_THREAD_STACK_DEFINE macro these are treated as kernel data objects through the python/cmake scripts of Zephyr.

I looked around on the header files so this is what I came up with, not sure if there is much straightforward approach in Zephyr ?

static Z_KERNEL_STACK_DEFINE_IN(my_stack_in_sram2,
                                4096,
                                __attribute__((section(".sram2_no_init"))));

and in my extra linker script I added

SECTIONS
{
    /* Place the .noinit section at the start of SRAM2 */
    .sram2_no_init (NOLOAD) :
    {
        . = ALIGN(4);
        _snoinit = .;
        *(.noinit)
        . = ALIGN(4);
        _enoinit = .;
    } > SRAM2
}

[vChavezB]

Hi @DerekSnell , as recommended here is my separate discussion. As you are working with the NXP LPC5500 have you explored allocating stacks in other SRAM regions? BTW I am using an NXP S32K1 that has two SRAM memory addresses.

So far this solution works for me but wanted to know if there is a more Zephyrish way of accomplishing this.