AM625: Display splash screen in U-boot on RGB display of our custom AM625 SOM

Aditya Tandulwadkar

Part Number: AM625

Tool/software:

Hi Ti experts,

I'm having issue in displaying splash screen on my RGB display connected to our custom AM625 SOM while in u-boot itself.
Their is an existing thread regarding to same issue and link for old post: Link
Please let me know if anything extra needed.

Thanks & Regards,
Aditya T

8 months ago

0 Krunal Bhargav34 8 months ago

TI__Mastermind 43735 points

Hi,

As I mentioned in previous thread, we do not support RGB splash in Uboot. Our SDK has only been tested with LVDS panel.

Regards,
Krunal

0 Aditya Tandulwadkar 8 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Hello,

Is their any chance of support for RGB display in U-Boot for any of the future sdk's?

Kind Regards,

Aditya T

0 Krunal Bhargav34 8 months ago in reply to Aditya Tandulwadkar

TI__Mastermind 43735 points

Hi,

On our SK EVM, we pinout the DPI signal to HDMI but in Uboot, there is not HDMI driver available for the bridge we use. Even if we enable DPI, we have no way of testing or upstreaming the code. Hence, we used LVDS for our testing and the code is also upstreamed. Additionally, another customer enabled DPI and added support on the E2E thread. I believe it was linked in the previous thread for your reference.

Regards,
Krunal

0 Aditya Tandulwadkar 8 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Hello,

Krunal Bhargav34 said:
On our SK EVM, we pinout the DPI signal to HDMI but in Uboot, there is not HDMI driver available for the bridge we use. Even if we enable DPI, we have no way of testing or upstreaming the code. Hence, we used LVDS for our testing and the code is also upstreamed.

Okay, then can you guide or provide an starting point for me?

Krunal Bhargav34 said:
Additionally, another customer enabled DPI and added support on the E2E thread. I believe it was linked in the previous thread for your reference.

No, I don't have any link of E2E thread in which your customer has already enabled DPI display in U-Boot of AM625.

Can you share the link again?

Thanks & Regards,

Aditya T

0 Krunal Bhargav34 8 months ago in reply to Aditya Tandulwadkar

TI__Mastermind 43735 points

Hi,

Our reference implementation is here: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_02_01_10/exports/docs/linux/Foundational_Components/U-Boot/UG-Splash-Screen.html?highlight=splash.

Customer enabling DPI reference is here: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1347685/am625-how-to-develop-dpi-display-driver-in-uboot/5186107#5186107

Regards,
Krunal

0 Aditya Tandulwadkar 7 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Hello,

Krunal Bhargav34 said:
Customer enabling DPI reference is here: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1347685/am625-how-to-develop-dpi-display-driver-in-uboot/5186107#5186107

I've tried this solution, but still unable to get display in u-boot.

Kind Regards,
Aditya T

0 Krunal Bhargav34 7 months ago in reply to Aditya Tandulwadkar

TI__Mastermind 43735 points

Hi,

As i mentioned earlier, we have not tested the above customer solution and our SDK testing was only done using LVDS panel.

Regards,
Krunal

0 Aditya Tandulwadkar 7 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Hello,

Krunal Bhargav34 said:
Customer enabling DPI reference is here: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1347685/am625-how-to-develop-dpi-display-driver-in-uboot/5186107#5186107

Is this the only solution your customer has got?
Or is there any other way to get splash in U-boot on RGB display?

Thanks & Regards,
Aditya T

0 Krunal Bhargav34 7 months ago in reply to Aditya Tandulwadkar

TI__Mastermind 43735 points

Hi,

It's the only solution that I am aware of that a customer posted on the public forum.

Regards,
Krunal

0 Aditya Tandulwadkar 7 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Hello,

Krunal Bhargav34 said:
It's the only solution that I am aware of that a customer posted on the public forum.

Okay, thanks.

Best Regards,

Aditya T

0 Zhang Hang 7 months ago in reply to Krunal Bhargav34

Prodigy 115 points

Hi,

I encountered the same problem as him, and we referenced the same link. Can TI provide some assistance for the display of RGB panels during the uboot phase? I have seen many people posting for help on e2e regarding this issue.

Best Regards,

Zhang

+1 Krunal Bhargav34 7 months ago in reply to Zhang Hang

TI__Mastermind 43735 points

Hi,

I understand the need for DPI based splash support but as of now we only support LVDS. The driver should support DPI as well but with our EVM we can't test that since we need to add support for HDMI. Besides adding panel configuration, I don't think there is PWM support in Uboot and it makes the implementation a little more tricky. Anyways, an internal request has been filed and our team is reviewing the feasibility.

Regards,
Krunal

0 Aditya Tandulwadkar 7 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Hello,

I've some questions

1. Is DPI and RGB display the same? Or they are totally different?

2. Can I print any .ppm file to display in u-boot/kernel?

3. Is there any chance for splash support for HDMI in U-boot in future SDK's?

Thanks & Regards,

Aditya T

+1 Krunal Bhargav34 7 months ago in reply to Aditya Tandulwadkar

TI__Mastermind 43735 points

Hi,

1) Yes, they are same.

2) Not sure I understand the question with regards to ppm file.

3) The main issue we run into is lack of SII9022A driver and I don't think there is an upstream driver in Uboot. Any work that our dev team does will not have an upstream path and it will quickly depreciate in future SDK.

Regards,
Krunal

0 Aditya Tandulwadkar 7 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Hello,

Krunal Bhargav34 said:
2) Not sure I understand the question with regards to ppm file.

This is not regarding ppm file, I've the prebuilt ppm files at this location: link, and generated from it a built in module in kernel.

But still the logo isn't displayed while kernel booting, can you give a look at this?

Best Regards,

Aditya T

0 Krunal Bhargav34 7 months ago in reply to Aditya Tandulwadkar

TI__Mastermind 43735 points

Hi,

Can you please create another thread for Kernel splash? I want to mix Uboot splash and Kernel splash into same thread.

Regards,
Krunal

0 Aditya Tandulwadkar 7 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Hello,

Okay. But can you tell me till when you and other Ti experts can provide support for RGB display in U-Boot?

Thanks & Regards,

Aditya T

+1 Krunal Bhargav34 7 months ago in reply to Aditya Tandulwadkar

TI__Mastermind 43735 points

Hi,

As of now, we are not offering support for RGB/HDMI splash in uboot. As I previously stated, an internal request has been filed and it's on our radar. However, I cannot give any timelines as of now.

Regards,
Krunal

0 Aditya Tandulwadkar 7 months ago in reply to Krunal Bhargav34

Intellectual 510 points

Okay, Thank you
Kind Regards,
Aditya T

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AM625: Display splash screen in U-boot on RGB display of our custom AM625 SOM