circuitpython/ports/stm32/boards/common_bss_heap_stack.ld
Angus Gratton 2c015375d1 stm32: Use a separate symbol name for the bootloader state pointer.
Prerequisite for enabling Link Time Optimisation.

The _bl_state address is the same as _estack, but _estack is referred to as
a uint32_t elsewhere in the code. LTO doesn't like it when the same symbol
has two different types.

Signed-off-by: Angus Gratton <gus@projectgus.com>
2022-06-28 10:25:08 +10:00

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/* This linker script fragment is intended to be included in SECTIONS. */
/* Zeroed-out data section */
.bss :
{
. = ALIGN(4);
_sbss = .;
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ebss = .;
} >RAM
/* This is to define the start of the heap, and make sure there is a minimum size */
.heap :
{
. = ALIGN(4);
. = . + _minimum_heap_size;
. = ALIGN(4);
} >RAM
/* This checks there is enough RAM for the stack */
.stack :
{
. = ALIGN(4);
. = . + _minimum_stack_size;
. = ALIGN(4);
} >RAM
/* _bl_state symbol is used by MICROPY_HW_ENTER_BOOTLOADER_VIA_RESET, this is
the end of stack address but is accessed as a different type. */
_bl_state = _estack;