AM2634-Q1: FLS write to wrong address when write across page

Hi Fan,

We are looking into this and get back to you.

Thanks And Regards,

Sunil Kumar M S

Hi, Sunil.

I compared Flash_norQspiWrite() from SDK, and Fls_norWrite() from MCAL, there are two more parameter check step in SDK to the offset, to make sure the offset is page aligned.

    /* Validate address input */
    if ((offset + len) > (attrs->flashSize))
    {
        status = SystemP_FAILURE;
    }
    /* Check offset alignment */
    if(0 != (offset % attrs->pageSize))
    {
        status = SystemP_FAILURE;
    }

And in Flash_offsetToBlkPage() in SDK, there is comment that "All writes must be page aligned for now".

This may be the reason for this issue.

But if in customer's use case, it is indeed require to write into Flash starting with address not page aligned, what is the suggestion?

Thanks.

Hello Fan,

Thank you for analysis. Yes, your understanding is correct here.

As per SDK implementation, for write operation the PAGE should be aligned for flash driver.

Agreed, customer use case it may differ, they may provide the address which are not aligned.

We shall discuss this LIMITATION internally and comeback.

Regards,

Pratik

Hi, Pratik,

One solution I can think of it is to check the "start Address + length to write", if the touching area crosses page, then the write operation should be performed in two stage, one in current page and the other in the next page. The erase operation should consider similar conditions.

Customer is asking for fix plan to this issue.

Thanks.  

Hello Fan,

This approach can be implemented for write operation. For Erase operation, we have proceed with erase type as Sector , Block or Chip erase itself.

Regards,

Pratik

Hi Fan,

Can we close this thread as we have provided a patch?

Thanks And Regards,

Sunil