R3840 i2c0 上挂载的设备咨询

mingming · May 26, 2026, 9:35am

hi：

我发现这个上面有个EEPROM，请问怎么去掉这个设备呢，我们自己设计这个总线上没有使用，然后看log 有i2c的报错

[  204.451263] tegra-i2c 810c630000.i2c: I2C transfer timed out
[  204.559259] tegra-i2c 810c630000.i2c: I2C transfer timed out
[  226.137881] [schedu][0xd7a8a7a][22:56:11.020355] wlan: [2795:I:OSIF] scan start scan id 40973

nagesh_accord · May 26, 2026, 10:13am

you might need to do device tree change and do reflash.

KevinFFF · May 27, 2026, 6:27am

Hi mingming,

Could you share the result of the following commands on your boar?

$ sudo i2cdetect -y 1
$ sudo i2cdump -f -y 1 0x50
$ sudo i2cdump -f -y 1 0x56

Please also provide the full dmesg and device tree for further check.

mingming · May 28, 2026, 2:23am

hi：

agi@tegra-ubuntu:~$ sudo i2cdetect -y 1
[sudo] password for agi: 
Warning: Can't use SMBus Quick Write command, will skip some addresses
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                                                 
10:                                                 
20:                                                 
30: -- -- -- -- -- -- -- --                         
40:                                                 
50: UU -- -- -- -- -- -- -- 58 -- -- -- -- -- -- -- 
60:                                                 
70:                                                 
agi@tegra-ubuntu:~$ sudo i2cdump -f -y 1 0x56
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
40: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
80: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
90: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
a0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
b0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
c0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
d0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
e0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
f0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
agi@tegra-ubuntu:~$ sudo i2cdump -f -y 1 0x56
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
20: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
30: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
40: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
80: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
90: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
a0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
b0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
c0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
d0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
e0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
f0: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX    XXXXXXXXXXXXXXXX
agi@tegra-ubuntu:~$

正常开机.log (239.5 KB)

1.dts.txt (331.3 KB)

agi@tegra-ubuntu:~$ sudo i2cdump -f -y 1 0x58
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 20 e0 08 22 33 a2 47 22 56 80 08 42 34 18 13 01     ??"3?G"V??B4???
10: 44 24 ff ff ff ff ff ff ff ff ff ff ff ff ff ff    D$..............
20: 20 e0 08 22 33 a2 47 22 56 80 08 42 34 18 13 01     ??"3?G"V??B4???
30: 44 24 ff ff ff ff ff ff ff ff ff ff ff ff ff ff    D$..............
40: 20 e0 08 22 33 a2 47 22 56 80 08 42 34 18 13 01     ??"3?G"V??B4???
50: 44 24 ff ff ff ff ff ff ff ff ff ff ff ff ff ff    D$..............
60: 20 e0 08 22 33 a2 47 22 56 80 08 42 34 18 13 01     ??"3?G"V??B4???
70: 44 24 ff ff ff ff ff ff ff ff ff ff ff ff ff ff    D$..............
80: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
90: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
a0: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
b0: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
c0: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
d0: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
e0: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
f0: 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                    
agi@tegra-ubuntu:~$ 
agi@tegra-ubuntu:~$ sudo i2cdump -f -y 1 0x50
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 02 00 fe 00 00 00 00 00 00 00 00 00 00 00 00 00    ?.?.............
10: 00 00 00 0c 36 39 39 2d 31 33 38 33 34 2d 30 30    ...?699-13834-00
20: 30 38 2d 34 30 31 20 41 2e 32 00 00 00 00 00 00    08-401 A.2......
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
40: 00 00 00 00 9b a4 dc 47 bb 4c 31 34 32 35 30 32    ....???G?L142502
50: 35 30 36 38 36 35 31 00 00 00 00 00 00 00 00 00    5068651.........
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
90: 00 00 00 00 00 00 4e 56 43 42 00 00 4d 31 00 00    ......NVCB..M1..
a0: 00 00 00 00 00 00 00 00 00 00 00 00 9b a4 dc 47    ............???G
b0: bb 4c 0c 00 00 00 00 00 00 00 00 00 00 00 00 00    ?L?.............
c0: 00 00 00 00 00 00 00 00 36 39 39 2d 31 33 38 33    ........699-1383
d0: 34 2d 30 30 30 38 2d 34 30 31 00 00 00 31 34 32    4-0008-401...142
e0: 35 30 32 35 30 36 38 36 35 31 00 00 00 00 00 00    5025068651......
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0a    ...............?
agi@tegra-ubuntu:~$

KevinFFF · May 28, 2026, 8:06am

I do not see these errors in the latest " 正常开机.log (239.5 KB)" shared from you.

If you do not have the EEPROM on custom carrier board, you may remove the following nodes in device tree.

		i2c@810c640000 {
			..
-			eeprom@56 {
-				compatible = "atmel,24c02";
-				reg = <0x56>;
-				label = "system";
-				vcc-supply = <0x145>;
-				address-width = <0x08>;
-				pagesize = <0x08>;
-				size = <0x100>;
-				read-only;
-			};

Please also remember to do the following modification before flash.
Jetson Thor Adaptation and Bring-Up — Modifying for EEPROM

mingming · May 28, 2026, 8:26am

hi：

810c630000.i2c: I2C transfer timed out

根据打印看是这个810c630000总线报错，你提供的eeprom@56在这个i2c@810c640000 上面，是不是搞混了，

KevinFFF · May 28, 2026, 8:37am

Why there’s no 810c630000.i2c: I2C transfer timed out error in this log you shared?

Do you have EEPROM from this interface so that you want to keep it?

mingming · May 28, 2026, 8:44am

那个日志我随后遇到了再提供下，现在没有了

KevinFFF · May 28, 2026, 8:49am

There’re no I2C devices under i2c@810c630000 node, and it seems you have disabled it.

		i2c@810c630000 {
			compatible = "nvidia,tegra264-i2c";
			status = "disabled";
			..

mingming · May 28, 2026, 8:52am

hi：

是不是要在pinmux的设备树也修改成别的功能？

KevinFFF · May 28, 2026, 8:56am

It depends on your use case and the requirement.
If you want to use them as GPIO, you can simply configure them in pinmux spreadsheet as following.

I found that they are configured as GPIO by defualt.

mingming · May 28, 2026, 9:14am

hi:

正如你所说，我们配置的这个，那看着没啥异常啊，不理解i2c总线上有设备访问报错

KevinFFF · May 29, 2026, 1:42am

If you want to use them as Input, then Drive 0 for the Pin Direction is invalid. Please configure Int PU instead.

If you have disabled i2c@810c630000 in device tree, then there should be no such error like 810c630000.i2c: I2C transfer timed out. Please help to monitor if there’s still the issue.

mingming · June 4, 2026, 1:58pm

hi：

我们在压测中

mingming · June 8, 2026, 7:36am

hi：

我抓了一份log，可以看看

i2c-time-out.log (131.7 KB)

KevinFFF · June 9, 2026, 6:53am

Could you run the following command on your board(when you hit the issue) and share extracted_proc.dts for further check?

$ sudo dtc -I fs -O dts -o extracted_proc.dts /proc/device-tree

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R3840 i2c0 上挂载的设备咨询

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