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Add first draft of memory checking for CCM RAM

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This commit is contained in:
Mario Hüttel 2021-05-20 23:55:32 +02:00
parent fe0bde5c32
commit 384e127085
3 changed files with 87 additions and 0 deletions
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64
stm-firmware/boot/startup-tests.c Normal file
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@ -0,0 +1,64 @@
#include "startup-tests.h"
uint32_t startup_test_perform_ccm_ram_check(void)
{
const void *ccmram_base = (void *)0x10000000UL;
const uint32_t ccmram_size = 64U * 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 *)ccmram_base; idx < ccmram_size / 4U; idx++) {
word_ptr[idx] = idx & 1 ? 0x55AA55AAUL : 0xAA55AA55UL;
}
for (idx = 0, word_ptr = (volatile uint32_t *)ccmram_base; idx < ccmram_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 *)ccmram_base; idx < ccmram_size / 4U; idx++) {
word_ptr[idx] = idx & 1 ? 0xAA55AA55UL : 0x55AA55AAUL;
}
for (idx = 0, word_ptr = (volatile uint32_t *)ccmram_base; idx < ccmram_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 static test with 0xFF */
for (idx = 0, word_ptr = (volatile uint32_t *)ccmram_base; idx < ccmram_size / 4U; idx++) {
word_ptr[idx] = 0xFFFFFFFFUL;
}
for (idx = 0, word_ptr = (volatile uint32_t *)ccmram_base; idx < ccmram_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 *)ccmram_base; idx < ccmram_size / 4U; idx++) {
word_ptr[idx] = 0x0UL;
}
for (idx = 0, word_ptr = (volatile uint32_t *)ccmram_base; idx < ccmram_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;
}

18
stm-firmware/boot/startup-tests.h Normal file
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@ -0,0 +1,18 @@
#ifndef _STARTUP_TESTS_H_
#define _STARTUP_TESTS_H_
#include <stdint.h>
/**
* @brief Do a RAM check of the CCM RAM.
*
* Loop over the whole CCM memory area and check it.
*
* @return 0 if successful. Else the defect address is returned.
* @warning This will completely corrupt this memory!
* You have to ensure to set it to sane values afterwards!
*/
uint32_t startup_test_perform_ccm_ram_check(void);
#endif /* _STARTUP_TESTS_H_ */

5
stm-firmware/boot/startup_stm32f407vx.c
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@ -19,6 +19,7 @@
*/ */
#include <stdint.h> #include <stdint.h>
#include "startup-tests.h"
/* C++ library init */ /* C++ library init */
# if defined(__cplusplus) # if defined(__cplusplus)
@ -297,6 +298,10 @@ void Reset_Handler(void) {
*/ */
CPACR |= (0xF << 20); CPACR |= (0xF << 20);
if (startup_test_perform_ccm_ram_check()) {
/* Hang forever in case of an error. We cannot handle this (yet?) */
while (1);
}
/* Copy .data section */ /* Copy .data section */
__init_section(&__ld_load_data, &__ld_sdata, &__ld_edata); __init_section(&__ld_load_data, &__ld_sdata, &__ld_edata);