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Jiayi_H_Intel's avatar
Jiayi_H_Intel
Icon for Occasional Contributor rankOccasional Contributor
3 years ago

How to access QSPI Flash from HPS f2h interface

Hi expert, I am using Stratix 10 SoC board. And my FPGA logic needs to access flash. In my setup, HPS boot from SD card not QSPI Flash. And QSPI locate at 0xff8d2000 in HPS's map. I connect my...
aikeu's avatar
aikeu
Icon for Regular Contributor rankRegular Contributor
3 years ago

Hi Jiayi_H_Intel,


Regarding the sf cmd in order to write to QSPI flash, need to take note that you will required to perform a sf erase first before you can write into it.

example:

sf erase 0 0x200000

// Erase 2MB from QSPI offset 0x0

// Note: If erase size is less than QSPI Flash page size, u-boot reports erase error


Before running any sf cmd, you will need to execute sf probe first.

As for sf write/read cmd:

sf write will be writting the content of the memory location specified in the cmd into QSPI flash.

sf read will be reading the data from QSPI flash into the memory location specified in the cmd.


You can use U-boot md cmd to check the changes in the memory location that you specified when performing sf write/read cmd.

U-Boot read command can be used to see what is programmed in to QSPI memory.


Thanks.

Regards,

Aik Eu


  • aikeu's avatar
    aikeu
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Example of working as below:

    • Jiayi_H_Intel's avatar
      Jiayi_H_Intel
      Icon for Occasional Contributor rankOccasional Contributor
      3 years ago

      Hi Aik Eu,

      Thanks for your reply. So in conclusion, the only way to access qspi flash is through sf cmd in boot stage. The function of sf cmd is to move data between flash and memory. And it is not allowed to access flash from FPGA side by F2H port. Is that correct?

      And much thanks for your help.