AM69A: Custom board bringup.

Minsoo Sun

Part Number: AM69A
Other Parts Discussed in Thread: SK-AM69

Tool/software:

We are developing a custom board using the SoC.

The main differences from the EVK are as follows:
1. Changed the MAIN debugging terminal: main_uart8 -> main_uart0
2. Decrease the number of DDR memory: 8GB x4 -> 8GB x2

We applied the hardware changes to the Linux and u-boot device trees.
Also, we've set TFA_K3_USART=0x0 and OPTEE_K3_USART=0x0 when compiling TFA&OPTEE. (Due to debugging terminal changed)

But, nothing comes out on debugging terminal.
( we also control LED to light up when the boot starts, but it does not. )

My question: To run A72 u-boot properly, does DDR settings that run on R5 u-boot need to be configured properly? ( currently using default settings from SK-AM69 )

Thanks.

17 days ago

0 Kevin S 17 days ago

TI__Mastermind 39020 points

Hi,

Minsoo Sun said:
But, nothing comes out on debugging terminal.

If you are not observing anything on the UART console, then you are likely failing before DDR initialization.

Minsoo Sun said:
My question: To run A72 u-boot properly, does DDR settings that run on R5 u-boot need to be configured properly?

Yes, A72 executes out of DDR so DDR needs to be configured properly by the R5 bootloader.

Minsoo Sun said:
2. Decrease the number of DDR memory: 8GB x4 -> 8GB x2

You will need to adjust the DDR configuration in your R5 bootloader.

Please use the DDR configuration tool to generate a new DDR DTSI file: https://dev.ti.com/sysconfig/?product=TDA4x_DRA8x_AM67x-AM69x_DDR_Config&device=J784S4_TDA4AP_TDA4VP_TDA4AH_TDA4VH_AM69x

Please also see this FAQ for customizing software for custom board: [FAQ] TDA4VM: TDA4x, DRA8x, AM68x, AM69x LPDDR4 Topics

Regards,
Kevin

0 Minsoo Sun 17 days ago in reply to Kevin S

Prodigy 150 points

Hi,

Kevin S said:
Please also see this FAQ for customizing software for custom board: [FAQ] TDA4VM: TDA4x, DRA8x, AM68x, AM69x LPDDR4 Topics

This is what I've been looking for. thanks.
I got a related question to this: What is SBL? I'm not sure where to place the header file.

Also, can I get a .syscfg file of SK-AM69 for DDR configuration tool?

Thanks,
Minsoo

+1 Keerthy J 17 days ago in reply to Minsoo Sun

TI__Guru**** 164480 points

Hello Minsoo,

Can you please answer the below questions:

Which exact SDK version are you using?
What is the boot flow? Are you using SPL/U-Boot basically Linux based boot or SBL?

You will have to make changes in SPL/SBL based on what you are using to boot the MCU R5F to accommodate the change in UART instance.

- Keerthy

0 Minsoo Sun 17 days ago in reply to Keerthy J

Prodigy 150 points

Hello Keerthy,

Keerthy J said:
Which exact SDK version are you using?

I'm currently using SDK11.

Keerthy J said:
What is the boot flow? Are you using SPL/U-Boot basically Linux based boot or SBL?

I'm using u-boot(SPL) to boot Linux.

Keerthy J said:
You will have to make changes in SPL/SBL based on what you are using to boot the MCU R5F to accommodate the change in UART instance.

With the provided information, I've managed to boot A72 u-boot.
It seems like proper .dtsi config and adjustment to code in this topic was very crucial.

Thanks.

0 Keerthy J 17 days ago in reply to Minsoo Sun

TI__Guru**** 164480 points

Awesome. Yes this is important. Let us know if anything else is needed.

- Keerthy

Processors

Processors forum

AM69A: Custom board bringup.