MPC5xxxのトピックErasing Flash in MPC5748G Causing Flash Corrupted

Erasing Flash in MPC5748G Causing Flash Corrupted

shanix — Fri, 21 Jul 2023 01:20:14 GMT

In my bootlodaer program, I need to erase flash region 0x1000000 - 0x127ffff on the 5748G. This time when I erase the falsh, some error condition occurs that causes the erase to fail, and I'm not sure exactly what causes the failure and this bootloader has worked fine for a long time. When I connected the debugger and checked the flash I found another region on the flash (0xFB0000 - 0xFB7FFFF) was corrupted. I would like to know what possible reasons could cause this to happen and what I can do in the software after the flash data is corrupted. Also is there some documentation about erasing and programing of the flash on 5748G. Thanks!

This is the erase function

static blt_bool FlashEraseSectors(blt_int8u first_sector_idx, blt_int8u last_sector_idx) { blt_bool result = BLT_TRUE; blt_int8u sectorIdx; blt_addr sectorBaseAddr; blt_int32u timeout_val; uint32_t *lockReg; uint32_t *selReg; blt_bool bNeedErase = BLT_FALSE; uint32_t sectorSize; /* validate the sector numbers */ if (first_sector_idx > last_sector_idx) { result = BLT_FALSE; } /* only continue if all is okay so far */ if (result == BLT_TRUE) { if (last_sector_idx > (FLASH_TOTAL_SECTORS - 1)) { result = BLT_FALSE; } } /* only continue if all is okay so far */ if (BLT_TRUE == result) { DISABLE_INTERRUPTS(); // initiate the erase operation C55FMC.MCR.B.ERS = 1; for (sectorIdx = first_sector_idx; sectorIdx <= last_sector_idx; sectorIdx++) { if (flashLayout[sectorIdx].erased == BLT_FALSE) { bNeedErase = BLT_TRUE; sectorBaseAddr = flashLayout[sectorIdx].sector_start; sectorSize = flashLayout[sectorIdx].sector_size; // unlock the block lockReg = (uint32_t*) ((uint32_t) &C55FMC.LOCK0.R + (flashLayout[sectorIdx].sel_reg * 4)); *lockReg &= ~(1UL << flashLayout[sectorIdx].sel_bit); // select the block to erase selReg = (uint32_t*) ((uint32_t) &C55FMC.SEL0.R + (flashLayout[sectorIdx].sel_reg * 4)); *selReg |= (1UL << flashLayout[sectorIdx].sel_bit); // write the first address in flash memory. (erase interlock write) *(blt_int32u*) sectorBaseAddr = 0xFFFFFFFF; /* Interlock write */ flashLayout[sectorIdx].erased = BLT_TRUE; } if (BLT_TRUE == bNeedErase) { // start the internal erase sequence C55FMC.MCR.B.EHV = 1; // wait until erase completed // erasing a 256KB sector takes about 1.2s to complete timeout_val = TimerGet() + ERASE_TIMEOUT_MS; while (C55FMC.MCR.B.DONE == 0) { // reset the watchdog CopService(); if (TimerGet() > timeout_val) { result = BLT_FALSE; break; } } // confirm erase was successful if (C55FMC.MCR.B.PEG != 1) { result = BLT_FALSE; } // de-select all blocks C55FMC.SEL0.R = 0; C55FMC.SEL1.R = 0; C55FMC.SEL2.R = 0; // end internal erase sequence C55FMC.MCR.B.EHV = 0; } } // end the erase operation C55FMC.MCR.B.ERS = 0; ENABLE_INTERRUPTS(); } (void) sectorSize; /* give the result back to the caller */ return result; } /*** end of FlashEraseSectors ***/

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Re: Erasing Flash in MPC5748G Causing Flash Corrupted

petervlna — Fri, 21 Jul 2023 05:15:54 GMT

Hello,

I would like to know what possible reasons could cause this to happen and what I can do in the software after the flash data is corrupted.

Ok, are there any violations of voltage once you start erase? is there an reset or just the erase fail?

Is C55FMC_MCR [PEG] set? Could you elaborate closet the failure analyzes?

Also is there some documentation about erasing and programing of the flash on 5748G. Thanks!

Yes, detailed documentation on erase /program is in reference manual: chapter 74.6.1.3 Erase

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Best regards,

Peter

Re: Erasing Flash in MPC5748G Causing Flash Corrupted

shanix — Fri, 21 Jul 2023 07:10:56 GMT

I am not sure is there any violations of voltage, but I am sure that there is no reset and C55FMC_MCR [PEG] is not set. It seems like that it is just the erase fail. Actually I can't provide more elaborated information, because when this happened due to the urgent need to get the device working properly, I have no time to do the failure analyzes. So I want to know some possible reasons that can make the flash corrupted happen. I think maybe these possible reasons will provide some useful clues to locate the root cause of this problem. Thanks.

Re: Erasing Flash in MPC5748G Causing Flash Corrupted

petervlna — Mon, 24 Jul 2023 07:15:24 GMT

Ok,

So short list:

1. voltage violation

2. Interrupts are on

3. random event, like radiation

4. executed code get lost and corrupted flash by interrupting its programming process.

You may also like to check if there was any exception called.

Best regards,

Peter

Re: Erasing Flash in MPC5748G Causing Flash Corrupted

shanix — Thu, 21 Sep 2023 09:23:58 GMT

Hi, petervlna, I want to know why interrupts can cause flash corrupted. And is there any software methods to recover the corrupted flash? Thanks.