PROCESSOR-SDK-AM62X: Booting from eMMC

Muthukumar MK

Hello Team,

I was exploring AM62X-EVM

Able to boot from SD card, when tried to boot from eMMC it is not booting up. attached the binaries and steps below.

# echo 0 > /sys/block/mmcblk0boot0/force_ro
# dd if=tiboot3.bin of=/dev/mmcblk0boot0 seek=0
# dd if=tispl.bin of=/dev/mmcblk0boot0 seek=1024
# dd if=u-boot.img of=/dev/mmcblk0boot0 seek=5120

stopped at u-boot prompt
=> mmc partconf 0 1 1 1
=> mmc bootbus 0 2 0 0

Changed the Boot switch to eMMC

BOOTMODE [ 8 : 15 ] (SW2) = 0000 0000

BOOTMODE [ 0 : 7 ] (SW1) = 1101 0011

referred: https://dev.ti.com/tirex/explore/node?node=A__AHRrRyaBVyh3lIzvQ8a6tQ__linux_academy_am62x__XaWts8R__LATEST

over 2 years ago

0 Muthukumar MK over 2 years ago

Intellectual 580 points

0 Prashant Shivhare over 2 years ago in reply to Muthukumar MK

TI__Guru* 77961 points

Hi Muthukumar,

I am not able to access the attached files. Can you please use the below feature to attach the files.

Regards,

Prashant

0 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

Hi Prashant,

Attached the file in a zip format.

0 Prashant Shivhare over 2 years ago in reply to Muthukumar MK

TI__Guru* 77961 points

Hi Muthukumar,

I am still not able to access the attached ZIP file. Could you please try the drag & drop feature.

Regards,

Prashant

0 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

AM62x_EVM_Bin.zip

Hi Prashant,

Please check now.

Also the AM62x EVM is not booting in UART mode as well, no message in UART(followed as per below screen).

in SD boot its working fine.

0 Prashant Shivhare over 2 years ago in reply to Muthukumar MK

TI__Guru* 77961 points

Hi Muthukumar,

Thanks! I can now access the attached ZIP file. Let me test these on my side once & get back to you.

0 Prashant Shivhare over 2 years ago in reply to Prashant Shivhare

TI__Guru* 77961 points

Hi Muthukumar,

Could you please follow the below guide which uses U-Boot for flashing the three binaries to eMMC.

https://software-dl.ti.com/.../Foundational_Components/U-Boot/UG-Memory.html#booting-tiboot3-bin-tispl-bin-and-u-boot-img-from-emmc-boot-partition-for-k3-class-of-socs

I use the same guide to flash the three binaries you shared to eMMC and using the same switch settings as yours, the binaries are booting fine on my board.

Regards,

Prashant

0 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

Hi Prashant,

I followed the steps but its not booting.

any idea why UART boot also not working in our EVM ?

0 Prashant Shivhare over 2 years ago in reply to Muthukumar MK

TI__Guru* 77961 points

Hi Muthukumar,

Could you please run the below commands from U-Boot

=> mw 0x43000030 0x3b 0x1
=> reset

The above commands will write the UART bootmode switch settings into a register which on warm reset makes ROM boot in UART boot mode. A sample run is shown below

Let me know if you are getting the UART string.

Regards,

Prashant

0 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

Yes Prashant,

I am getting the UART output

0 Prashant Shivhare over 2 years ago in reply to Muthukumar MK

TI__Guru* 77961 points

So, this probably looks like a hardware problem. Probably the hardware UART or eMMC bootmode switch settings are not somehow getting latched into the corresponding register.

Can you also try the below commands to boot from eMMC

=> mw 0x43000030 0xcb 0x1
=> reset

A sample run is shown below

Let me know if this is also working. In that case, I will loop in my colleague to comment on the hardware side.

Regards,

Prashant

0 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

Yes Prashant,

It worked !

0 Prashant Shivhare over 2 years ago in reply to Muthukumar MK

TI__Guru* 77961 points

This looks good.

So to debug the hardware issue, could you please share the picture of UART & eMMC bootmode switch settings you are doing on your board. This will help us confirming the switch settings you are using.

Regards,

Prashant

0 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

Hi Prashant,

Please refer below images

I was referring the switch settings in "https://software-dl.ti.com/mcu-plus-sdk/esd/AM62X/latest/exports/docs/api_guide_am62x/EVM_SETUP_PAGE.html#BOOTMODE_EMMC"

0 Prashant Shivhare over 2 years ago in reply to Muthukumar MK

TI__Guru* 77961 points

Hi Muthukumar,

Thanks! If you are following the shared images, then the boards should boot. Also, I believe you are using the same guide for SD card switch settings also & it is set according to the below image

Let me loop in my colleague to debug why the switch settings are not working. Please expect a response by next week. In the meantime, I believe you can use the previously suggested approach to boot from eMMC.

Thanks & Regards,

Prashant

0 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

Thanks Prashant,

Will work on the rest of items..

should I create a separate thread or you will loop in the same thread ?

0 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

Hello Prashant,

can you share me the command to boot from NOR .

Thank you

0 Prashant Shivhare over 2 years ago in reply to Muthukumar MK

TI__Guru* 77961 points

Hi Muthukumar,

The command for OSPI NOR bootmode is

=> mw 0x43000030 0x273 0x1
=> reset

Actually, you can also derive the value to write into the register. It is derived from the actual bootmode switch settings. Just divide the switch settings into groups of 4. Then, derive the hexadecimal value for each group.

For example, the OSPI NOR boot mode switch setting is

If I divide the switch settings into groups of 4, I get: 0000 (B15-B12), 0010 (B11-B8), 0111 (B7-B4), 0011 (B3-B0). Then, using the hexadecimal value for each, we get 0x273.

About the hardware issue, I think creating a new thread is a good idea as you suggest. It will keep the different contexts in different threads.

Regards,

Prashant

+1 Muthukumar MK over 2 years ago in reply to Prashant Shivhare

Intellectual 580 points

OK Thanks Prashant.

Will create a new thread.

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PROCESSOR-SDK-AM62X: Booting from eMMC