topic Re: imx8m plus fuse in i.MX Processors

imx8m plus fuse

james_wu1 — Thu, 29 Apr 2021 07:56:05 GMT

hi support team

I try to burn MAC address in boot Fusemap (address 0x640 MAC_0_ADDR) on i.MX8m plus

suppose my mac address is aabbccddeeff

my setting command is:

u-boot=> fuse prog -y 9 0 0xeeff

u-boot=> fuse prog -y 9 1 0xaabbccdd

but I read back incorrect value. as below.

Word 0x00000000: ffdfbfaf
u-boot=> fuse read 9 1
Reading bank 9:

Word 0x00000001: 072fffff

Then system use random MAC address.

thank you for help.

James

Re: imx8m plus fuse

igorpadykov — Fri, 30 Apr 2021 00:19:49 GMT

Hi James

what uboot version used in the case, one can try latest

https://source.codeaurora.org/external/imx/uboot-imx/tree/?h=imx_v2020.04_5.4.70_2.3.0

or Demo Image i.MX 8M Plus EVK

Best regards
igor

Re: imx8m plus fuse

james_wu1 — Tue, 04 May 2021 07:05:52 GMT

hi Igor

Thank you for your answer

my u-boot version

U-Boot 2020.04-gb2c7f94-dirty (May 04 2021 - 13:33:09 +0800)
aarch64-linux-gnu-gcc (GNU Toolchain for the A-profile Architecture 8.3-2019.03(arm-rel-8.36)) 8.3.0
GNU ld (GNU Toolchain for the A-profile Architecture 8.3-2019.03 (arm-rel-8.36)) 2.32.0.20190321

if "fuse prog" command success is it possible refuse again? or only one time can "fuse prog" ?

for example: If we program incorrect MAC address, how to fuse prog again. (erase the mac area (address 0x640 MAC_0_ADDR) ...) the fuse prog a correct MAC address.

Another question: How to register a LVDS panel brightnessSupport to imx8mp android10 system?

Our LVDS panel able to display but SurfaceControl.getDisplayBrightnessSupport return false

in frameworks\base\services\core\java\com\android\server\lights\LightsService.java

so can not control the panel brightness.

Best regards

James

Re: imx8m plus fuse

igorpadykov — Tue, 04 May 2021 10:53:30 GMT

>if "fuse prog" command success is it possible refuse again? or only one time can "fuse prog" ?

it is one time programmable, so can not be changed after programming. Also may be useful

https://community.nxp.com/t5/i-MX-Processors/OCOTP-write-support-on-i-mx8m/m-p/825028

Best regards
igor

Re: imx8m plus fuse

khang_letruong — Fri, 11 Jun 2021 04:26:15 GMT

Dear @james_wu1 ,

I have similar attention to fuse the MAC address of my MX8MP based custom board using u-Boot. Could you please let me know where to find the bank number as well as the words' order, please.

Thanks very much,
Khang