AM625: Am6254 Based Custom Board Debug UART

Murali Chikkanna

Part Number: AM625
Other Parts Discussed in Thread: SYSCONFIG

Hi TI,

We are trying to bring up the debug UART Interface(MAIN_UART0) on our Custom Board. We don't have SD Card Slot to load the Images. We try to Load the Images

using UART/USB DFU Method. The steps we followed to test UART Boot mode is listed below:

1. Boot Mode Pins are configured to UART Boot.

2. Connected a TTL Converter to connect the UART (RX,TX) to the Host System.

3. After turning ON the Board, I can able to see some Data on the Debug Terminal(/dev/ttyUSB0), but when i try to transfer

tiboot3.bin image using x-modem, I receive an NACK and Transfer Incomplete as response.

I have tried this on the Am62x-SK Board(E2 Version), it was successfully Booted.

I have also attached the Image for your reference. Kindly let us know how to proceed on this.

Regards,

Murali Chikkanna

over 2 years ago

0 Judith Mendez over 2 years ago

TI__Expert 8480 points

Hi Murali,

Which bootloaders are you using the boot the custom board? If you built the bootloaders yourself, have you verified that the binaries work/boot?

Here is some documentation on UART: https://software-dl.ti.com/processor-sdk-linux-rt/esd/AM62X/08_06_00_42/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/UART.html?highlight=uart.

Also, on the custom device, it seems like the SoC is alive and UART boot mode is working, can you copy and paste the string of characters between the CCCC.. as per this doc: https://software-dl.ti.com/processor-sdk-linux-rt/esd/AM62X/08_06_00_42/exports/docs/linux/Foundational_Components_Migration_Guide.html#device-types to see what device type you have.

~ Judith

0 Judith Mendez over 2 years ago in reply to Judith Mendez

TI__Expert 8480 points

One thing to look out for is to remove 'hardware flow control' in minicom configuration.

~ Judith

0 Murali Chikkanna over 2 years ago in reply to Judith Mendez

Prodigy 145 points

Hi Mendez,

Thanks for the response,

Yes, we had some reset issues which is causing the RESETSTATz Pin to toggle. After doing some hardware changes, we got the debug uart working as expected.

Now We can load tiboot3.bin file and get the related logs on the Debug UART, but afer that we are not receiving any response from uart to transfer tispl.bin file.

We are using using the SDK Version ti-processor-sdk-linux-am62xx-evm-08.05.00.21-Linux-x86-Install.bin.

We built the images by following the below mentioned link..

https://dev.ti.com/tirex/explore/node?node=A__AE9QJS6sYz1lbERsguPCIg__linux_academy_am62x__XaWts8R__8.3.0.0%20v1&search=am62x

The only change we made is changed the ddr config file which is created through sysconfig(lpddr4) and added the header file inside k3-am625-r5-sk.dts file.

The built the images tiboot3.bin, tispl.bin, u-boot.img.

Kindly let us know do we need to chage any other parameters while building the files.

Regards,

Murali Chikkanna

0 Judith Mendez over 2 years ago in reply to Murali Chikkanna

TI__Expert 8480 points

Hi Murai,

Let me verify UART boot mode works on 08.05 and I will get back to you.

--> Now We can load tiboot3.bin file and get the related logs on the Debug UART, but afer that we are not receiving any response from uart to transfer tispl.bin file.
What steps are you using to boot with UART boot mode?

~ Judith

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AM625: Am6254 Based Custom Board Debug UART