LPC55S16 TrustZone ThreadX

rjmalmeida0 — Mon, 22 Jan 2024 11:03:48 GMT

Hello,
I am currently using the LPC55S16EVK board and developing a small program using TrustZone and ThreadX. I am running using the hello_world_s example from the SDK version 2.15 and I am adding ThreadX component into the hello_world_ns application. I have added the TX_SINGLE_MODE_NON_SECURE flag in the Preprocessor of the mentioned project. My main file for the secure world only performs a call to Normal World, while the non-secure main file is shown here:

/* * Copyright 2018 NXP * * SPDX-License-Identifier: BSD-3-Clause */ #include "fsl_device_registers.h" #include "fsl_debug_console.h" #include "veneer_table.h" #include "pin_mux.h" #include "clock_config.h" #include "board.h" #include "fsl_power.h" #include "tx_api.h" /******************************************************************************* * Definitions ******************************************************************************/ #define DEMO_STACK_SIZE 1024 #define DEMO_BYTE_POOL_SIZE 9120 #define DEMO_BLOCK_POOL_SIZE 100 #define DEMO_QUEUE_SIZE 100 #define PRINTF_NSE DbgConsole_Printf_NSE /******************************************************************************* * Prototypes ******************************************************************************/ TX_THREAD my_thread; void my_thread_fnc(ULONG thread_input); /* memory pool */ char mem_pool[DEMO_BYTE_POOL_SIZE]; TX_BYTE_POOL byte_pool_0; /******************************************************************************* * Code ******************************************************************************/ void SystemInit(void) { } /*! * @brief Main function */ int main(void) { int result; /* set BOD VBAT level to 1.65V */ POWER_SetBodVbatLevel(kPOWER_BodVbatLevel1650mv, kPOWER_BodHystLevel50mv, false); PRINTF_NSE("Welcome in normal world!\r\n"); tx_kernel_enter(); return 0; } void tx_application_define(VOID *first_unused_memory) { int ret = 0xFF; CHAR *pointer = TX_NULL; TX_THREAD_NOT_USED(first_unused_memory); /* Create a byte memory pool from which to allocate the thread stacks. */ tx_byte_pool_create(&byte_pool_0, "byte pool 0", (VOID *)mem_pool, DEMO_BYTE_POOL_SIZE); /* Allocate the stack for thread 0. */ tx_byte_allocate(&byte_pool_0, (VOID **)&pointer, DEMO_STACK_SIZE, TX_NO_WAIT); /* Create the main thread. */ ret = tx_thread_create(&my_thread, "thread 0", my_thread_fnc, 0, pointer, DEMO_STACK_SIZE, 1, 1, TX_NO_TIME_SLICE, TX_AUTO_START); /* Release the block back to the pool. */ tx_block_release(pointer); } void my_thread_fnc(ULONG thread_input) { PRINTF_NSE("Thread 0 started...\r\n"); while(1) { tx_thread_sleep(10); } }

After starting the kernel and the task (ret value inside tx_application_define returns correctly), it triggers an HardFault on the instruction shown below:

The BX lr instruction crashes the system as the Link Registers shows an invalid memory value.

Any help would be appreciated.
I attached the TrustZone config file.

Kind regards,
Rui

Re: LPC55S16 TrustZone ThreadX

rjmalmeida0 — Mon, 22 Jan 2024 14:23:25 GMT

Furhter testing shows that LR does not present invalid values. The call for _tx_thread_shell_entry when a thread is ready to run triggers an HardFault_Handler

Re: LPC55S16 TrustZone ThreadX

rjmalmeida0 — Wed, 24 Jan 2024 14:14:04 GMT

I was able to get ThreadX runnig on non-secure world by adding the SDK ThreadX folder into a VSCode generated hello_word TrustZone project. I added ThreadX on both secure and non-secure apps and added the macro TX_SINGLE_MODE_SECURE on the secure app and TX_SINGLE_MODE_NON_SECURE on the non-secure app.
Althrough it seems to work correctly I am not sure if this configuration is correct.

LPC MicrocontrollersのトピックLPC55S16 TrustZone ThreadX

LPC55S16 TrustZone ThreadX

Re: LPC55S16 TrustZone ThreadX

Re: LPC55S16 TrustZone ThreadX