I2C-8 bus missing in Xavier NX devkit board

[854053437]

Hi, everyone, I used Xavier NX devkit with R35.3.1. But I met a boot kernel ops while using, it looks like the same situation in

R35.2.1 Xavier NX tegra194_cbb_err_isr

We upgraded the L4T version to R35.3.1, however it still occasionally starts Oops, can you tell us what might be the cause? [ 6.651130] CPU:0, Error: cbb-noc@2300000, irq=15 [ 6.651322] ************************************** [ 6.651506] CPU:0, Error:cbb-noc [ 6.651633] Error Logger : 0 [ 6.651786] ErrLog0 : 0x80030000 [ 6.651906] Transaction Type : RD - Read, Incrementing [ 6.652068] Error Code : SLV [ 6.652222] Erro…

So I did the same change in dtb file and the problem didn’t show again. But there is another question is that the disabled node dpaux@155F0000 seems controls I2C-8(i2c@31e0000) pinmux. After disable it, I can detect I2C-8 using i2cdetect. But I want to use it to test my i2c device.
In this topic, it shows that i2c-8 pin can not be controlled by pinmux.cfg

Is I2C5_CLK/DATA, (i2c9 i2c@31e0000) usable?

Hi, I double checked by changing the pinmux of I2C5_CLK/DATA (pin A53/C53) to DP_AUX_CH3_P/N function, and changing them back to I2C5_CLK/DATA function. And I can 100% confirm that the generated dtsi files are the same. And the converted pinmux .cfg files are the same as well. From pinmux perspective, how come I2C and DP_AUX function gives the same dtsi and pinmux .cfg file? How can I use devmem2 command to verify the pinmux settings for I2C5_CLK/DATA are really set to i2c? I did some invest…

Do you konw how to fix it? Can I modify the dtb file to make i2c enable but not enable node dpaux@155F0000?

nvidia@nvidia:~/test$ sudo i2cdetect -l
i2c-3   i2c             3190000.i2c                             I2C adapter
i2c-10  i2c             i2c-2-mux (chan_id 1)                   I2C adapter
i2c-1   i2c             c240000.i2c                             I2C adapter
i2c-101 i2c             15210000.display                        I2C adapter
i2c-6   i2c             31c0000.i2c                             I2C adapter
i2c-4   i2c             Tegra BPMP I2C adapter                  I2C adapter
i2c-2   i2c             3180000.i2c                             I2C adapter
i2c-0   i2c             3160000.i2c                             I2C adapter
i2c-9   i2c             i2c-2-mux (chan_id 0)                   I2C adapter
i2c-7   i2c             c250000.i2c                             I2C adapter
i2c-5   i2c             31b0000.i2c                             I2C adapter

[ShaneCCC]

What did you do?

@854053437

So I did the same change in dtb file

[854053437]

remove this node from device tree

dpaux@155F0000 {
            status = "disabled";
        };

R35.2.1 Xavier NX tegra194_cbb_err_isr

可以嘗試把這個關掉再測試看看嗎 dpaux@155F0000 { status = "okay";

[ShaneCCC]

Doesn’t looks like remove that was the solution for that.
Please using the J5.0.2 UEFI for the kernel oops.

Cbb causing a kernel panic

Then I think the issue here is from the UEFI. Please use the UEFI from jp5.0.2 version and test.

[WayneWWW]

please refer to this patch.

Xavier NX can not boot with L4T35.4.1

please apply this patch. diff --git a/drivers/soc/tegra/powergate-bpmp.c b/drivers/soc/tegra/powergate-bpmp.c index 06c792b..5e17731 100644 --- a/drivers/soc/tegra/powergate-bpmp.c +++ b/drivers/soc/tegra/powergate-bpmp.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0-only /* - * Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved + * Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved */ #include <linux/of.h> @@ -9,6 +9,7 @@ #include <linux/slab.h> #incl…

[854053437]

Thank you for help, I apply this patch and use the original device tree. There is no such kernel ops in 10 times reboot flow. I think this patch can solve the kernel ops problem and I can use the I2C-8 as well.

And do you know why this problem happens using the original kernel source? Is it due to the powergate from your patch?

[WayneWWW]

Yes, it is a known issue from xavier display driver.

[854053437]

So when we use the Jetson_Linux_R35.3.1_aarch64.tbz2 downloaded from NVIDIA and don’t change anything, this issue will come out in some time?
Because I flash the R35.3.1 to Xavier NX devkit and use for about two days before the issue occur。

[WayneWWW]

Yes, this is intermittent issue.

[854053437]

ok, and thank you again for explanation.