Nov 2020: uTasker i.MX RT V1.4.12 is productive - with complete secure loading concept.
Follow uTasker updates at www.twitter.com/uTasker !!
Online Forum registration has now been disabled. Please send an email to an address at the bottom of the home page with your preferred user name and email address if you would like an account.
Return to uTasker main site: www.utasker.com
Show Posts
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
static void fnRestoreFlexRAM(int iReset)
{
IOMUXC_GPR_GPR16 = IOMUXC_GPR_GPR16_DEFAULT; // set the FlexRAM layout back to that taken from the eFuse setting (default configuration)
if (iReset != 0) {
APPLICATION_INT_RESET_CTR_REG = (VECTKEY | SYSRESETREQ); // request cortex core reset, which will cause the software reset bit to be set in the mode controller for recognition after restart
}
}const FLEXSPI_NOR_BOOT_CONFIGURATION __attribute__((section(".boot_hdr.conf"))) __boot_config
= {
....
(unsigned long)fnRestoreFlexRAM // insert the address of a routine that can be called to return the FlexRAM back to default settings and reliably reset the device
};// This routine is called to reset the processor
//
extern void fnResetBoard(void)
{
#if !defined iMX_BOOTLOADER
uDisable_Interrupt();
#endif
#if (!defined iMX_BOOTLOADER && !defined NO_STACK_RESET)
fnStackReset(1); // {7} if the boot loader supports this method the code will not return
#endif
APPLICATION_INT_RESET_CTR_REG = (VECTKEY | SYSRESETREQ); // request cortex core reset, which will cause the software reset bit to be set in the mode controller for recognition after restart
IOMUXC_GPR_GPR16 = IOMUXC_GPR_GPR16_DEFAULT; // set the FlexRAM layout back to that taken from the eFuse setting (default configuration) - although the reset is commanded before executing this line it still operates and avoids the RAM layout being changed when the code is still running
}// If the watchdog fires this interrupt is called 255 clock cycles before the watchdog reset actually takes place
//
static __interrupt void wdog3_irq(void)
{
__disable_interrupt();
#if !defined NO_STACK_RESET
fnStackReset(0); // {7} if the boot loader supports this method the code will not return
#endif
IOMUXC_GPR_GPR16 = IOMUXC_GPR_GPR16_DEFAULT; // set the FlexRAM layout back to that taken from the eFuse setting (default configuration)
FOREVER_LOOP() {}
}// This routine calls a routine in QSPI flash that reconfigures the FlexRAM back to its default and then conditionally commands a core reset
//
extern void fnStackReset(int iReset)
{
#if defined SECURITY_OTFAD
void (*_fnCode)(int) = (void (*)(int))(*(unsigned long *)(FLEXSPI_FLASH_BASE + 0x600)); // fixed location in QSPI flash of code to be executed
#else
void (*_fnCode)(int) = (void (*)(int))(*(unsigned long *)(FLEXSPI_FLASH_BASE + 0x200)); // fixed location in QSPI flash of code to be executed
#endif
if (((unsigned long)_fnCode < FLEXSPI_FLASH_BASE) || ((unsigned long)_fnCode > (FLEXSPI_FLASH_BASE + 0x8000))) {
return; // no valid code exists
}
_fnCode(iReset); // execute (doesn't return but either reset or wdog reset will restart the processor after the flexRAM has been set to default)
}