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reflow-oven-control-sw
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Write memory test for system RAM

This commit is contained in:
Mario Hüttel 2021-05-22 11:25:55 +02:00
parent 3345004213
commit ebb1383957
3 changed files with 108 additions and 5 deletions
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62
stm-firmware/boot/startup-tests.c
View File

@ -62,3 +62,65 @@ uint32_t startup_test_perform_ccm_ram_check(void)
exit_ret_address:
return ret;
}
uint32_t startup_test_perform_system_ram_check()
{
const void *ram_base = (void *)0x20000000UL;
const uint32_t ram_size = 128U * 1024UL;
volatile uint32_t *word_ptr;
uint32_t target_val;
uint32_t idx;
uint32_t ret = 0UL;
/* Perform inversion test with 0x55 and 0xAA, Part 1 */
for (idx = 0, word_ptr = (volatile uint32_t *)ram_base; idx < ram_size / 4U; idx++) {
word_ptr[idx] = idx & 1 ? 0x55AA55AAUL : 0xAA55AA55UL;
}
for (idx = 0, word_ptr = (volatile uint32_t *)ram_base; idx < ram_size / 4U; idx++) {
target_val = idx & 1 ? 0x55AA55AAUL : 0xAA55AA55UL;
if (target_val != word_ptr[idx]) {
ret = (uint32_t)&word_ptr[idx];
goto exit_ret_address;
}
}
/* Perform inversion test with 0x55 and 0xAA, Part 2 */
for (idx = 0, word_ptr = (volatile uint32_t *)ram_base; idx < ram_size / 4U; idx++) {
word_ptr[idx] = idx & 1 ? 0xAA55AA55UL : 0x55AA55AAUL;
}
for (idx = 0, word_ptr = (volatile uint32_t *)ram_base; idx < ram_size / 4U; idx++) {
target_val = idx & 1 ? 0xAA55AA55UL : 0x55AA55AAUL;
if (target_val != word_ptr[idx]) {
ret = (uint32_t)&word_ptr[idx];
goto exit_ret_address;
}
}
/* Perform static test with 0xFF */
for (idx = 0, word_ptr = (volatile uint32_t *)ram_base; idx < ram_size / 4U; idx++) {
word_ptr[idx] = 0xFFFFFFFFUL;
}
for (idx = 0, word_ptr = (volatile uint32_t *)ram_base; idx < ram_size / 4U; idx++) {
target_val = 0xFFFFFFFFUL;
if (target_val != word_ptr[idx]) {
ret = (uint32_t)&word_ptr[idx];
goto exit_ret_address;
}
}
/* Perform static test with 0x00 */
for (idx = 0, word_ptr = (volatile uint32_t *)ram_base; idx < ram_size / 4U; idx++) {
word_ptr[idx] = 0x0UL;
}
for (idx = 0, word_ptr = (volatile uint32_t *)ram_base; idx < ram_size / 4U; idx++) {
target_val = 0x0UL;
if (target_val != word_ptr[idx]) {
ret = (uint32_t)&word_ptr[idx];
goto exit_ret_address;
}
}
exit_ret_address:
return ret;
}

7
stm-firmware/boot/startup-tests.h
View File

@ -14,5 +14,12 @@
*/
uint32_t startup_test_perform_ccm_ram_check(void);
/**
* @brief Do a RAM check of the stnadard SRAM regions
* @return 0 if successful. If an error is found, the faulty address is returned
* @warning This completely destroys all content in the memory!
* @warning Ensure that the stack pointer is moved to a different memory reagion (CCM RAM)!
*/
uint32_t startup_test_perform_system_ram_check(void);
#endif /* _STARTUP_TESTS_H_ */

44
stm-firmware/boot/startup_stm32f407vx.c
View File

@ -289,7 +289,7 @@ extern unsigned int __ld_eheap;
#define CPACR (*((volatile uint32_t *)0xE000ED88))
void Reset_Handler(void) {
void __attribute__((noreturn)) Reset_Handler(void) {
/* Stack is already initialized by hardware */
/* The first thing we do here, is to initialize the FPU
@ -298,10 +298,9 @@ void Reset_Handler(void) {
*/
CPACR |= (0xF << 20);
if (startup_test_perform_ccm_ram_check()) {
/* Hang forever in case of an error. We cannot handle this (yet?) */
while (1);
}
/**
* Prepare RAM etc for the System Init function. This ensures, the RAM tests execute at max speed.
*/
/* Copy .data section */
__init_section(&__ld_load_data, &__ld_sdata, &__ld_edata);
@ -316,6 +315,41 @@ void Reset_Handler(void) {
/* Set clocks, waitstates, ART operation etc. */
SystemInit();
if (startup_test_perform_ccm_ram_check()) {
/* Hang forever in case of an error. We cannot handle this (yet?) */
while (1);
}
/* Move the Stack pointer to CCMRAM
* This allows us to perform a RAM test on the main RAM.
* Note: sp is not required to be inside the clobber list!
*/
__asm__ __volatile__ ("mov sp, %0\n\t" :: "r"(0x10000000UL + (64U * 1024UL)) :);
if (startup_test_perform_system_ram_check()) {
while (1);
}
/* Move the stack pointer back. Note: This only works if this function does not use the stack for variables.
* Otherwise everything will be broken.
*/
__asm__ __volatile__ ("mov sp, %0\n\t" :: "r"(&__ld_top_of_stack) :);
/**
* RAM tests destroyed our values. So we have to copy them again...
*/
/* Copy .data section */
__init_section(&__ld_load_data, &__ld_sdata, &__ld_edata);
/* Fill bss with zero */
__fill_zero(&__ld_sbss, &__ld_ebss);
/* Fill Heap with zero */
__fill_zero(&__ld_sheap, &__ld_eheap);
/* Fill static CCM memory with zeroes */
__fill_zero(&__ld_sbss_ccm, &__ld_ebss_ccm);
/* Init CCM RAM data section */
__init_section(&__ld_load_ccm_data, &__ld_sdata_ccm, &__ld_edata_ccm);
/* C++ init function */
#if defined(__cplusplus)