RTOS/AM4379: Modifying QSPI clock in SBL

user5176523

Part Number: AM4379

Tool/software: TI-RTOS

Hi TI,

I tested the QSPI Flash in MLO and APP on board AM4379, and found the QSPI clk is different between them(12MHz in MLO, about 50MHz in APP).

Could you tell me how to modify the clk in MLO.

Thamks

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The RTOS team have been notified. They will respond here.

0 Rahul Prabhu over 8 years ago

TI__Guru** 116870 points

The SBL uses the file sbl_qspi.c to initialize QSPI IP for boot. The bootloader code uses the QSPI library to setup the QSPI IP.

Refer to the function PDK_INSTALL_PATH\packages\ti\starterware\bootloader\src\sbl_qspi.c.
The QSPI lib that initializes the interface is qspi_lib.c at location PDK_INSTALL_PATH\packages\ti\starterware\library\qspilib\qspi_lib.c

The DCLK_DIV is set using the function QSPISetPreScaler () in qspi.c in dal folder.

The other part of this setup if to program the functional clock that is driven into QSPI IP. You can use the clock tree tool to trace that setup.
processors.wiki.ti.com/.../AM437x_Clock_Tree_Tool

Regards,
Rahul

0 user5176523 over 8 years ago in reply to Rahul Prabhu

Prodigy 30 points

Hi Rahul,

Thanks for your response~

Now i used the same code to compile the MLO and APP, but there are different QSPI clk in MLO and APP(12MHz in MLO, about 50MHz in APP).
So how can i change the QSPI clk to 50MHz?

Thanks

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RTOS/AM4379: Modifying QSPI clock in SBL