TUSB8044A:In the initial state of this device, I want to enable the USB signals to allow the CPU to boot from USB.

What is the difference between USB0 port and USB1 port of CPU?

Best

brian

Hello, Brian-san,

The image transfer is performed using the USB 0 port. I also mentioned the USB 1 port to indicate that no other USB ports can be used.

In other words, it is necessary to connect HUB ICs to all the CPU's USB ports. And I want to transfer the ROM image via the HUB IC in its initial state.

BR

YUKIOOYAMA

Hi Yukio:

    Can you draw a block diagram? Hub upstream port can only connected to one host.

Best

brian

Hello Brian-san,

Here is the block diagram related to USB. I hope it provides the information you need.

BR,

YUKIOOYAMA

Hi YUKIOOYAMA:

   Let me check with our system and get back to you by tomorrow.

Regards

brian

Hi Brian-san,

Thank you for informing me of the confirmation results.

I understood that the HUB requires a driver to operate.

In my opinion, the driver is loaded by U-boot (although I am not sure if the U-boot provided by TI includes the HUB_IC driver at the beginning). Since the bootloader operates before loading U-boot, the HUB probably cannot function at that stage.

I will consider reviewing the my system configuration or using a different boot sequence.

Thank you for your response.

BR

YUKIOOYAMA