AM6548: SD card Boot issue

Sushruta Shetty

Part Number: AM6548
Other Parts Discussed in Thread: AM4379

Hi Team,

We have designed a board with AM6548 Processor. We are in board bring up stage.

Currently, we are facing an issue with AM6548 SD card boot. We are observing 25Mhz clock for MMC1_CLK and some junk prints in MCU UART0 and Main UART0.

We have configured SD card(MMC1) as primary boot source and have disabled secondary boot source. We have verified all the boot mode pin settings. We have probed clock and found it stable.

Please let us know if we need to check any other conditions to proceed further to debug the issue.

Any other recommendations or suggestions shall be highly appreciated.

Thanks and Regards,

Sushruta

over 6 years ago

0 Mehmet over 6 years ago

Expert 1255 points

Hi Sushruta,

Did you see this page ?
processors.wiki.ti.com/.../AM335x_board_bringup_tips

You can check "Is the device alive" test.
switch from SD card boot to UART boot and verify that you have CCC stream on your console.
This means that the ROM is executing and is attempting to boot.

0 Pavel Botev over 6 years ago

TI__Guru**** 170625 points

Sushruta,

I can also provide below hints:

- try this SD card with AM65x EVM or AM65x IDK board and check if will boot up properly (at least to some stage)
- you can run the MMC/SD diagnostic tests on your custom board and EVM/IDK board, compare the results - mmcsd_TEST, mmcsdStress_TEST

software-dl.ti.com/.../index_board.html

Regards,
Pavel

0 Sushruta Shetty over 6 years ago in reply to Mehmet

Intellectual 655 points

Thank you for your reply.

As suggested by you, we switched to UART boot mode and observed CCC stream on console.

Could you please share the UART boot image for the processor.

Thank you.

Regards,

Sushruta

0 Mehmet over 6 years ago in reply to Sushruta Shetty

Expert 1255 points

Hi Sushruta,

As I said above it is only "Is the device alive" test. If you see stream of 'C' characters output on a terminal, this means that the ROM is executing and is attempting to boot according to this document

We also designed custom design board with AM4379 and I am newbee. I learned many things from Pavel.

In our board, after "Is the device alive" test, we switched back from UART boot to a SD card boot .

And we created boot image with this link. If you want to create boot image at linux host you must follow this link

I would recommend this training series .

Best regards,

Mehmet

0 Pavel Botev over 6 years ago in reply to Sushruta Shetty

TI__Guru**** 170625 points

Sushruta,

What SW do you use (Linux, RTOS, Android)?

www.ti.com/.../processor-sdk-am65x

Regards,
Pavel

0 Sushruta Shetty over 6 years ago in reply to Pavel Botev

Intellectual 655 points

Pavel,

We are using RTOS and below is the file that we are referring to. However, this does not have UART Boot image in it.

ti-processor-sdk-rtos-am65xx-evm-05.03.00.07-Linux-x86-Install.bin

Regards,
Sushruta

0 Pavel Botev over 6 years ago in reply to Sushruta Shetty

TI__Guru**** 170625 points

Sushruta,

UART boot is not supported by default in the AM65x RTOS, only MMCSD and OSPI boot is supported. Refer to the below user guide for details:

software-dl.ti.com/.../index_Foundational_Components.html

Regards,
Pavel

0 Sushruta Shetty over 6 years ago in reply to Pavel Botev

Intellectual 655 points

Hi Pavel,

Thank you for all your inputs. SD card boot is working fine for us.

However, we are facing an issue with USB0 port.

USB0 port is working in host mode. However, it is not getting enumerated in device mode.

Kindly share your thoughts on this.

Regards,

Sushruta

0 Pavel Botev over 6 years ago in reply to Sushruta Shetty

TI__Guru**** 170625 points

Sushruta,

Please open new e2e thread regarding your USB0 device mode issue.

Regards,
Pavel

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AM6548: SD card Boot issue