Hi!
I'm running into quite a strange problem which is that when trying to use SPM secure services in my program, I get a BUS FAULT error.
What's also really strange is that the error doesn't occur on the function call but a few ms after. The function exits correctly and returns the expected value and then, the program crashes.
When I try to remove the secure function call, the BUS FAULT error stops occurring as well as when I remove all SYS_INIT. No matter which one I keep, I get the BUS FAULT error.
K_SEM_DEFINE(sem_end, 0, 1)
void main(void)
{
printk("Calling secure function\n");
uint32_t result;
int ret = spm_request_read(&result, (uint32_t)&NRF_FICR_S->INFO.PART,
sizeof(uint32_t));
if (ret != 0) {
printk("Could not read FICR (err: %d)\n", ret);
}
printk("FICR.INFO.PART = 0x%08X\n\n", result);
printk("Calling secure function success!\n");
k_sem_take(&sem_end, K_FOREVER);
}
LOG output:
Calling secure function FICR.INFO.PART = 0x00009120 Calling secure function success! [00:00:01.583,923] <inf> protobuf: Initializing protobuf [00:00:02.583,953] <err> os: ***** MPU FAULT ***** [00:00:02.583,984] <err> os: Instruction Access Violation [00:00:02.583,984] <err> os: r0/a1: 0x00000000 r1/a2: 0xe000ed00 r2/a3: 0x200156c0 [00:00:02.583,984] <err> os: r3/a4: 0x20014a00 r12/ip: 0x871dfabe r14/lr: 0x0001c80d [00:00:02.584,014] <err> os: xpsr: 0x61000000 [00:00:02.584,014] <err> os: Faulting instruction address (r15/pc): 0xab55d3c4 [00:00:02.584,014] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0 [00:00:02.584,014] <err> os: Current thread: 0x20014a00 (unknown) [00:00:02.646,697] <err> os: Halting system
There is nothing special happening in that protobuf function except the LOG output (I disabled everything else):
static int protobuf_init(const struct device *dev)
{
ARG_UNUSED(dev);
LOG_INF("Initializing protobuf");
return 0;
}
SYS_INIT(protobuf_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
Thanks by advance to anyone that can help me with this issue !
