Nano production module: Micro SD card not working at full speed

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Analog to here I discovered that at SD-card added to the slot of a Nano production based carrier board (Auvidea JN30B, Jetpack 32.3.1) is running only at ultra high speed (~85MB/s) after first boot. After a soft reboot the speed falls back to just high speed (~20MB/sec).
Thetegra210-porg-p3448-common.dtsi in the source looks like:

sdhci@700b0400 { /* SDMMC3 for SD card on NANO */
                status = "okay";
                keep-power-in-suspend;
                non-removable;
                mmc-ddr-1_8v;
                mmc-ocr-mask = <3>;
                uhs-mask = <0x0>;
                //max-clk-limit = <400000>;
                tap-delay = <3>;
                nvidia,vmmc-always-on;
        };

This file was compiled and flash to the device as described here.
After first boot:

sudo cat /sys/kernel/debug/mmc1/ios
clock:          204000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    6 (sd uhs SDR104)
signal voltage: 1 (1.80 V)
driver type:    0 (driver type B)

After reboot

sudo cat /sys/kernel/debug/mmc1/ios
clock:          50000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    2 (sd high-speed)
signal voltage: 0 (3.30 V)
driver type:    0 (driver type B)

An upgrade to a newer Jetpack Version is currently not possible (due to dependencies to our rootfs).
What could I try to get the sd card to working at uhs speed after reboot?

3

The 32.3.1 version is too old. Suggest to upgrade version.

Or try this patch.

5

Thank you for your help. After applying the patch, the sd card is detected as a uhs device even after a reboot.
Sadly now while doing some read- and write-tests on the sd-card, the device seems to completely reset itself.

6

Any idea what could be the issue that my device is restarting if a lot of reads and writes happen to the sd-card. (They only occurre after first soft reboot)

7

sorry. Really no idea about it especially you are using a very old software.

8

@WayneWWW
The latest version supported by Auvidea for the used device is NVIDIA L4T 32.6.1. In addition to a working sd card we need to disable the spread spectrum (like here).
How do I disable that on 32.6.1 for a Jetson Nano Production?