How to program i.mx6 efuse to boot from eMMC(SD3)

[tsaiderek]

Hi All,

We want to boot IMX6 device from eMMC interface  (SD3)

so  we need to configure the boot device type by BOOT_CFG[7:4] eFUSEs as 0110 configuration

i.MX 6Dual/6Quad Applications Processor Reference Manual

From Table 5-4

we should setting 0x450

     imxotp blow --force 5 0x00005060

and if we need WDOG support

we should setting 0x460

    imxotp blow --force 6 0x00200000

Is it correct or not?

[igorpadykov]

Hi tsai

it is unclear which BOOT_CFG you are trying to blow.

Please use Table 5-7 SD/eSD Boot Fusemap IMX6DQRM

and below links

Q&A: How to program i.MX6 eFUSE?

mx6 efuse

Best regards

igor

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[tsaiderek]

Hello igor

thanks for your reply.

I'm sorry I did not describe clearly.

My board is based on eMMC sdhc3

I have already boot from setting  Boot Mode[1:0]= 10 (Boot from Board setting)

and gpio setting BOOT_CFG1[7:4] =0110 , BOOT_CFG[6:3] = 1010

then i want to test setting  Boot Mode[1:0]= 00 (Boot from fuse)

I think setting should be

0x450[31:0] = 0x00005060

and i try to add WDOG for serial download

0x460[31:0] =  0x00200000

or i should setting 0x460[31:0] = 0x00200010 ?

thanks for your help

[igorpadykov]

Hi tsai

could you explain your choice with meaning every fuse bit per bit from this table?

I can understand :

"WDOG for serial download

0x460[31:0] =  0x00200000"

and think that this is right.

~igor

[tsaiderek]

Hello igor,

I have set up 0x450[31:0] = 0x5060, 0x460[31:0]=0x200010

use

echo 0x5060 > /sys/fsl_otp/HW_OCOTP_CFG4

echo 0x200010 > /sys/fsl_otp/HW_OCOTP_CFG5

and all work fine

thanks for your help

[ShawnBai]

Thank you, very helpfullll.