eFuse configuration in iMX7D sabresd reference board

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eFuse configuration in iMX7D sabresd reference board

2,753 Views
sangili
Contributor I

Hi,

I'm using iMX7D sabresd reference board.

When BOOT_MODE is 00b (SW2-00) board booting from SD card because eFuse boot configuration were already written so ROM code fetching boot loader from SD card.

I just want to read the efuse boot configuration from the board, so i tried in following way.

1. ==> fuse read 0x01 0x03 and the result is 0x0 same result for bank2,word0(BOOT_CFG1) and BOOT_CFG2, 3 and 4.

2. Then i tried from linux. 

     cat /sys/fsl_otp/HW_OCOTP_BOOT_CFG0 result is 0x0 and same for BOOT_CFG1,2,3 and 4.

How to read the efuse boot configuration data?

Thanks

Sangili

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b36401
NXP TechSupport
NXP TechSupport

Alternatively you can read eFuse with "imxotp read" u-boot command.

Have a great day,
Victor

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b36401
NXP TechSupport
NXP TechSupport

I'm sorry. Right command for i.MX7 u-boot is "fuse read" not "imxotp read".

Have a great day,
Victor

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sangili
Contributor I

Hi Victor,

So i am using right command to read the efuse configuration.

Why i'm getting data as 0x00, what is the procedure to get those data.

Do you have any idea of default efuse configuration for iMX7D sabresd while shipping?

Thanks

Sangili

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