Forum Post: CORTEX M4 HARD FAULT PROBLEM USING A PROPRIETARY BOOTLOADER

when i download an application sometimes it ends up in a fault interrupt the situation: TI Cortex M4 TM4C1294NCPDT IAR compiler (7.40.1) user written bootloader with lwip-library to download a new application over network no RTOS the problem: when I download an application with the bootloader it ends in a fault interrupt when the __iar_program_start() is called if i start the same application at the same flash location (0x40000) using the debugger, it works fine when i read the registers i get the following values: HARD FAULT STATUS REG: Forced = 1 ICSR: Vector = 0x03 FAULT STATUS REGISTER: Invalid State = 1 PROGRAM STATUS REG: Thumb = 1 the problem seems to depend on the amount of memory used!!! if i increase the size of an array it fails, otherwise i can start the downloaded code. works: "P2": 0x12cd0 P2 s0 0x20000000 0x4 .data inited 0x20000000 0x1 shuttle_flash.o [1] .bss zero 0x20000004 0x12360 shuttle_flash.o [1] .bss zero 0x20012364 0xc8 shuttle_flash.o [1] .bss zero 0x2001242c 0x94 shuttle_flash.o [1] .bss zero 0x200124c0 0x4 shuttle_flash.o [1] .bss zero 0x200124c4 0x4 shuttle_flash.o [1] .bss zero 0x200124c8 0x4 shuttle_flash.o [1] .bss zero 0x200124cc 0x1 shuttle_flash.o [1] .bss zero 0x200124cd 0x1 shuttle_flash.o [1] .bss zero 0x200124ce 0x1 shuttle_flash.o [1] .noinit uninit 0x200124d0 0x800 startup_ewarm.o [1] - 0x20012cd0 0x12cd0 pui32Stack 0x200124d0 0x800 Data Lc startup_ewarm.o [1] fails: "P2": 0x12d60 P2 s0 0x20000000 0x4 .data inited 0x20000000 0x1 shuttle_flash.o [1] .bss zero 0x20000004 0x123f0 shuttle_flash.o [1] .bss zero 0x200123f4 0xc8 shuttle_flash.o [1] .bss zero 0x200124bc 0x94 shuttle_flash.o [1] .bss zero 0x20012550 0x4 shuttle_flash.o [1] .bss zero 0x20012554 0x4 shuttle_flash.o [1] .bss zero 0x20012558 0x4 shuttle_flash.o [1] .bss zero 0x2001255c 0x1 shuttle_flash.o [1] .bss zero 0x2001255d 0x1 shuttle_flash.o [1] .bss zero 0x2001255e 0x1 shuttle_flash.o [1] .noinit uninit 0x20012560 0x800 startup_ewarm.o [1] - 0x20012d60 0x12d60 pui32Stack 0x20012560 0x800 Data Lc startup_ewarm.o [1]