AM2732: Question on QSPI flash support

Hi Chris Meng,

There is flash selection guide for AM263x which will be true for AM273x as well - https://www.ti.com/lit/an/sprad50/sprad50.pdf

Chris Meng said:

1. Is QE bit set MUST for the qspi flash? If not, will the ROM code set the QE bit? If yes, does the ROM default QE register is at bit 6 of Status Register 1? 

ROM does not set the QE bit in the device. While writing into the flash the QE bit is set by the Flasher Application. ROM  (in 1s-1s-4s) assumes that the QE bit is already set.

Chris Meng said:

2. Would you pls kindly advise the detail flow of the boot from QSPI? Such as send SFDP command first, etc.

The RBL flow is documented in the section of the TRM (for AM263x) for (4s) mode. If you need any more information do let me know.

5.4.1.1.1 QSPI (4S) Bootloader Operation

As a corrective action, I will raise a ticket to fix the documentation.

Best Regards,
Aakash

Aakash,

Thanks for your info! It is helpful!

Aakash Kedia said:

While writing into the flash the QE bit is set by the Flasher Application.

I checked the uniflash code and didn't find QE bit set operation. So the uniflash doesn't set QE bit by default, right? Pls correct me if I miss anything.

Best Regards,

Chris