How to access QSPI Flash from HPS f2h interface

Hi Jiayi_H_Intel,

When u-boot boot up, in u-boot type help. Check for a command which is bridge. Then select bridge enable and see any difference.

Thanks.

Regards,

Aik Eu

Hi Jiayi_H_Intel,

Can provide the base address of the IP involves in your qsys design?

Thanks.

Regards,

Aik Eu

Hi Jiayi_H_Intel,

Is is possible that you can sent me your design in email?

I not sure how big is the size.

Thanks.

Regards,

Aik Eu

Hi Jiayi_H_Intel,

For Stratix10, I think you may not able to access the sdm_QSPI on the FPGA side since you are booting up from sd-card. I afraid the access to the sdm_QSPI will not be allowed. Some of the boot up configuration was written in the sdm_QSPI when booting up, so simply writing to the sdm_QSPI may overwrite the configuration data.

Anyway, Can try "sf probe" in U-boot and see. Do let me know what will show after that?

I think you were trying to write to to sdm_QSPI_register(0xFF8D2000), maybe can try to write to the sdm_QSPI_data_Address(0xFF900000 to 0xFF9FFFFF) instead.

Can check with the Stratix10 HPS Address Map, link as below:

https://www.intel.com/content/www/us/en/programmable/hps/stratix-10/hps.html#dap1505405910812.html

After sf probe, try the below read/write example link below using sf command in U-boot:

https://blog.krybot.com/a?ID=01550-3cc5b429-9aaf-45e5-b934-b73d31966d36

Thanks.

Regards,

Aik Eu

Hi Jiayi_H_Intel,

Is the sf write/read working? Can verify try that also and let me know.

Do perform sf probe first before sf write/read.

Thanks.

Regards,

Aik Eu

Hi Jiayi_H_Intel,

Got any follow up from the previous comment?

Thanks.

Regards,

Aik Eu

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

Hi Jiayi_H_Intel,

The sdm QSPI is on the FPGA side. The sf cmd we tried is one of the method to read/write from HPS side. Another method will be considering the Mailbox Client IP in your design in order to do that.

Refer to the document below for Mailbox Client IP:

https://www.intel.com/content/www/us/en/docs/programmable/683290/21-3-20-1-0/mailbox-client-fpga-ip-user-guide.html

Normally is not advisable to write on the sdm QSPI as some of the FPGA configuration data is written there while booting up from sd card for the case of Stratix 10 devices.

Anyway if you are confident that you will not overwrite those data, then probably can consider doing so for your system operation.

Thanks.

Regards,

Aik Eu

Hi Jiayi_H_Intel,

I will close this thread if no further question. Do consider open a new thread if there is new follow up question.

Thanks.

Regards,

Aik Eu