Fusing MAC addresses in IMX8

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Fusing MAC addresses in IMX8

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a_thomas
Contributor II

Hello everyone,

I want to fuse the correct fuses using UBoot. However, I'm slightly confused about the fusing of MAC addresses for IMX8. According to reference manual, on Page 876.

Fuse address (offset ) for MAC is 0x640. I interpreted the following: This fuse is 32 bits long,  reseved for higher 16 bits. How would i program the Lower 32 bits?

Page876.png

This is stated on Page 885. Offsets at 0x640, 0x650, 0x660 are reserved for writing MAC addresses from software.

Page885.png

I'm really confused as to how to interpret this ambiguous information regarding MAC_ADDR fuses.

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6 Replies

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rohitdubey
Contributor III

Hi,

In case anyone is still looking for a solution for this, the below commands worked for me from the u-boot prompt (AA:BB:CC:DD:EE:FF):

fuse prog 9 0 0xDDCCBBAA

fuse prog 9 1 0xFFEE

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pgentili
Contributor III

Hi, on iMX8M Mini the order is a little bit different:

if MAC Address is Aa:Bb:Cc:Dd:Ee:Ff the uboot commands would be:
fuse prog 9 0 Cc:Dd:Ee:Ff
fuse prog 9 1 Aa:Bb

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kikote
Contributor II

WARNING WARNING

The address sequence is not OK for u-boot imx8mq AVNET MaaX board

rohitdubey wrote: "u-boot prompt (AA:BB:CC:DD:EE:FF)" ....

But for imx8mq u-boot should be FF:EE:DD:CC:BB:AA !

p.p I screwed a chip, but luckily the highest byte is 0x7A ( bit 0 is not 1, multicast etc)


 

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Yuri
NXP TechSupport
NXP TechSupport

Hello,

 

  I hope the following helps:

"Burn exact MAC address to eFuse in imx6"

https://community.nxp.com/message/387036 >

 

Have a great day,

Yuri

 

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a_thomas
Contributor II

Thanks for the quick reply,  i neither have this folder on my system

fsl_otp

under /sys folder nor this file

HW_OCOTP_MAC0
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Yuri
NXP TechSupport
NXP TechSupport

Hello,

  fuse burning under Linux now is not supported. Use U-boot fuse command.

  

OCOTP_HW_OCOTP_MAC_ADDR1 = (((mac_data[0] & 0xFF) << 8) | (mac_data[1] & 0xFF));

OCOTP_HW_OCOTP_MAC_ADDR0  = (((mac_data[2] & 0xFF) << 24) | ((mac_data[3] & 0xFF) << 16) | ((mac_data[4] & 0xFF) << 8) | (mac_data[5] & 0xFF));

OCOTP_HW_OCOTP_MAC_ADDR0  is Bank 9, word 0.

OCOTP_HW_OCOTP_MAC_ADDR1 is Bank 9, word 1.

Regards,

Yuri.

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