QN9080 Flash Protection

rickdickerson — Sat, 14 Mar 2020 15:13:02 GMT

Hello. I am trying to protect the first several pages in the QN9080 flash and am running into trouble with erasing unprotected pages. In order to test the problem, I have reduced the protection to a single page and the problem persists.

(Note: I have my flash mapped to address zero, so I am using address 0x00000000 as the start of page zero for this discussion.)

I have protected the page zero by writing 0xFFFFFFFE to address 0x0007F800.

I have disabled flash and memory protection by writing 0x00000001 to address 0x0007F820.

I am using SDK_2_.x_QN908XCDK version 2.2.0 (Manifest Version 3.0.0).

If I try to erase address 0x7000, which is page 14, the call to FLASH_PageErase (in fsl_flash.c) fails because the LOCKL_INT bit in FLASH>INT_STAT is set. However, the flash does get erased and the ERASEL_INT bit also gets set. I have seen the device erase multiple pages without any error, and then the LOCKL_INT bit will get on a subsequent erase. I haven't been able to find any pattern for this except that the LOCKL_INT bit will never get set if I do not protect any flash pages.

I have also found that if I clear the LOCKL_INT bit and try the erase again, the FLASH_PageErase function will not fail.

Why is the LOCKL_INT error bit getting set for unprotected pages, even though the erase succeeds?

Thanks,
Rick

Re: QN9080 Flash Protection

stephanie_m — Fri, 20 Mar 2020 18:51:10 GMT

Hello,

When you mention you clear the LOCKL_INT how do you do it? According to the UM of the device the access to the register is only meant to be read .

Do you mean the LOCKL_INT_EN?

Regards ,

Estephania

Re: QN9080 Flash Protection

rickdickerson — Fri, 20 Mar 2020 19:18:11 GMT

Estephania,

Any insight into why the LOCKL_INT status flag is getting set when erasing unprotected pages?

I am using the LOCKL_INT_CLR bit in the INT_CLR register to clear the status flag.

Thanks,
Rick

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