PROCESSOR-SDK-J784S4: U-boot unable to access peripherals configuration space

Clement FR

Part Number: PROCESSOR-SDK-J784S4
Other Parts Discussed in Thread: TDA4VH

Hello

Platform is evaluation board of J784s4

Booting from SD card with u-boot

I stop the autoboot by hitting a key, then I want to read/write in some peripherals configuration registers (using md and mw).

I've tried:

- UART0 --> crash (Unhandled exception abort...)
- PCIe intd_cfg or dbn_cfg --> crash

only UART8 at 0x2880000 is successful

So I guess something prevents the access to these memory ranges
--> can you point out what ?
is it possible to go around it

Thank you
Best regards

over 3 years ago

0 Keerthy J over 3 years ago

TI__Guru**** 170020 points

Clement,

Yes this is not enabled at power up. Do you need to enable this as the console on your custom board?

Regards,

Keerthy

0 Clement FR over 3 years ago in reply to Keerthy J

Genius 4750 points

Thanks for the answer Keerthy.

I am investigating something with the PCIe peripheral (see TDA4VH-Q1: PCIe Linux configuration for inbound memory - Processors forum - Processors - TI E2E support forums )
and wanted to verify that the default value of the register was the right one during uboot.

On previous SoCs (C6678 or AK2H14 it was quite easy to enable the power domain of peripherals, for example with a GEL file)

On TDA4VH is there a similar mechanism that I could use before booting up Linux ?

Thank you

0 Keerthy J over 3 years ago in reply to Clement FR

TI__Guru**** 170020 points

Clement,

Can you list out the peripherals that you want to enable using GEL script?
I can check with the team internally & get back.

- Keerthy

0 Clement FR over 3 years ago in reply to Keerthy J

Genius 4750 points

PCIE0 would be enough for now

0 Parth Nagpal over 2 years ago in reply to Clement FR

TI__Mastermind 42135 points

Hi,

Apologies for delay in response. Is this issue still open?

If yes, you can refer to Main_PCIe_PowerUp API in ccs<Version>\ccs\ccs_base\emulation\gel\J784S4_TDA4VH\J7AHP_PSC\J7AHP_PSC.gel.

This API should power up all the pcie module from the GEL file. You can export this API as a hotmenue from M core and run it once your U-boot is loaded.

Regards,
Parth