i.MX ProcessorsのトピックRe: Fusing MAC addresses in IMX8

Fusing MAC addresses in IMX8

a_thomas — Wed, 12 Jun 2019 16:49:55 GMT

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?

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

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

Re: Fusing MAC addresses in IMX8

Yuri — Thu, 13 Jun 2019 08:36:58 GMT

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

-------------------------------------------------------------------------------

Note:

- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored

Please open a new thread and refer to the closed one, if you have a related question at a later point in time.

Re: Fusing MAC addresses in IMX8

a_thomas — Mon, 17 Jun 2019 06:10:45 GMT

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

fsl_otp‍

under /sys folder nor this file

HW_OCOTP_MAC0‍

Re: Fusing MAC addresses in IMX8

Yuri — Fri, 28 Jun 2019 07:04:29 GMT

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.

Re: Fusing MAC addresses in IMX8

rohitdubey — Tue, 26 May 2020 18:45:28 GMT

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

Re: Fusing MAC addresses in IMX8

kikote — Tue, 29 Dec 2020 16:05:15 GMT

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)

Re: Fusing MAC addresses in IMX8

pgentili — Fri, 23 Jul 2021 07:41:55 GMT

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