TDA4VE-Q1: How to boot from emmcboot0

add one question.

because emmc has two boot partition. i want to use boot0 and boot1 to save SBL, and the offset is the same.

sometimes i want to boot from boot0, sometimes i want to boot from boot1. i hope i can contorl it with some conditon.

Is this idea feasible？if it is ok. How to make it boot from boot1 not boot0?

Hi Xie 

xie jc said:

We want to boot from emmc boot0 partition.

but i find it not work.

When you say it did not worked does that mean you are not getting the SBL logs ?

What are the steps you followed?

xie jc said:

want to use boot0 and boot1 to save SBL, and the offset is the same.

sometimes i want to boot from boot0, sometimes i want to boot from boot1. i hope i can contorl it with some conditon.

If you want ROM to take the SBL from the other boot partition (boot 1) then you need to modify the EXCSD PARTITION_CONFIG register . If you see the PDK documentation 

below we are using mmc utility provided by the UBOOT to modify the boot partition.

https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-j784s4/08_06_00_14/exports/docs/pdk_j784s4_08_06_00_31/docs/userguide/j784s4/boot/boot_k3.html?highlight=emmc

If you want to do the same inside the SBL you can use MMCSD_CMD_ENABLEBOOTPARTITION MMCSD control command 

Regards
Diwakar

Hi Diwakar,

Thanks for your reply.

When you say it did not worked does that mean you are not getting the SBL logs ?

Yes. i can not see any logs in SBL. 

What are the steps you followed?

when the SBL work fine, i will check it as your advise.

How can i check the bootmode in my board? maybe it is not right in HW setting. Is there any register to check this thing?

Thanks

Hi Xie 

xie jc said:

How can i check the bootmode in my board? maybe it is not right in HW setting. Is there any register to check this thing?

You can have a look at the CTRL_MMR_WKUP_DEVSTAT and CTRL_MMR_MAIN_DEVSTAT register 

Regards
Diwakar