RM46L852: Bootloader fails write verification on address 0x0

Casey Gregoire

Part Number: RM46L852

Using the sample bootloader i made an application that can update the bootloader itself, the only problem i have now is that after writing the boot loader reads the address it just wrote to to confirm that it wrote successfully. But on the first address it always reads back 0xFFFFFFFF. So it seems that it reads back that the erase worked, but not the write. I took out the verification and every does write successfully, it just doesn't think it does. Is there anything special about the lower address range when it comes to reading back from it after a write?

over 4 years ago

0 Miro over 4 years ago

TI__Mastermind 21425 points

Hello,

Sorry for the delay. Your question was addressed but our expert is OOO. He will answer as soon as possible.

0 QJ Wang over 4 years ago in reply to Miro

TI__Guru**** 190296 points

Hello Casey,

Did you check the content manually in memory browser window? Is the content match what you has written to this address?

0 Casey Gregoire over 4 years ago in reply to QJ Wang

Intellectual 330 points

Yes, the write is working. Since my post i found two things. If put in a small delay between write and verification (for loop 1-10000 with _nop call) the verification works when updating the application image, but it still hangs completely if i am updating the boot loader itself.

0 QJ Wang over 4 years ago in reply to Casey Gregoire

TI__Guru**** 190296 points

Hello Casey,

Updating the bootloader itself is tricky. Another way you can try is to swap the flash and SRAM. The flash will be mapped to 0x0800_0000, and SRAM is mapped to 0x0000_0000. After memory swapping, the code will be loaded ot SRAM and execute from SRAM.

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RM46L852: Bootloader fails write verification on address 0x0