PROCESSOR-SDK-J722S: J722S EMMC Bootmode Confirmation

Bin Zhou

Tool/software:

I have some doubts about the bootmode of J722S, such as "Reserved BOOTMODE signals must not be left floating" written on TRM. If I choose EMMC bootmode, according to the description in the SDK,

I should choose BOOTMODE [8:15] (SW4) = 0000 0000 BOOTMODE [0:7] (SW3) = 1101 0011,

but the TRM mentions that bootmode pin7, 8, and 9 are reserved.

Can we randomly select the high and low levels of pin7, 8, and 9 without following the above?

For example: BOOTMODE [8:15] (SW4) = 1100 0000 BOOTMODE [0:7] (SW3) = 1101 0010.

We have tried the above boot mode combination. J722S can boot normally from emmc, but we don't know if there is any risk in doing so.

Thinks；

6 months ago

+1 Gokul Praveen 6 months ago

TI__Genius 10920 points

Hi Bin,

Bin Zhou said:
We have tried the above boot mode combination. J722S can boot normally from emmc, but we don't know if there is any risk in doing so.

Since these bootmode pins 7,8,9 are reserved,setting it to high or low would not cause any risk in case of eMMC boot.

What floating means is that those pins must be connected to some voltage level,so that it does not get influenced by any electrical noise.

Also,Bin,can you help by closing this thread if the issue is resolved.

Regards

Gokul

0 Bin Zhou 6 months ago in reply to Gokul Praveen

Prodigy 20 points

Thanks

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PROCESSOR-SDK-J722S: J722S EMMC Bootmode Confirmation