Hi , We have developed a custom base board based on nano SOM . In which we haveSD card as a peripheral , normal class 4 high speed sd card is detected properly .But when we connect an UHS 1 SD card , we are getting and error stated below and the card is not even detected. mmc1: error -110 whilst i…

Hi, We don’t know whether Sandisk UHS-I card has problem or not. But still suggest you to find other UHS-I cards and do the test.

Hi, Which release are you using? Could you try rel-32.4.3?

@WayneWWW , No I am using L4T 32.2.1 , should I upgrade it , Is there any issues in SD with the version I am using?

Hi wayne, The board doesnt have a SDMMC_VDD_EN .But the same base board detects UHS card with the folloing spec with xavier nx SOM, clock: 208000000 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 …

2)I have wired for SDMMC_VDD_EN.What change should I do in dtb for that.Where should I mention the gpio that I have wired. I think you could refer to this topic. Actually this one almost resolved every sdcard image we’ve met. [image] SD card write error on NX Jetson Xavie…

will definitely try the patch that you have mentioned.But it looks like the patch is for NX. As you have asked to summarize the issues, 1)UHS1 SD not detected in Nano. 2)UHS1 SD detected with SD104 in NX, but the speeds are low ,as I have mentioned earlier.(nearly 25 MBps) Both the SOMs are test…

Hi, the WAR to bypass CMD11 in kernel image ( Jetson Nano SD card enters back to high speed mode instead of uhs mode after soft reboot ) has “nvidia,vmmc-always-on” in the dt? These two patches are for both Nano and NX. This should resolve the low speed issue. As for the “1)UHS1 SD not detected …

Hi , I currently dont have access to xavier Nx SOM , will check that on monday. Regd., the card not detected issue on UHS Nano, I have tried with different cards and could you please show a sample of dtb with vmmc-supply added one.I am asking this because I tried this and didn’t work. This is how…

Should I add a similar entry in nano too ? Yes, you have to. You have to write a similar regulator and assign this regulator to the vmmc-supply. If this is still not clear to you, try to search keyword “p3448_vdd_3v3_sd” in the device tree folder and write similar one.

Hi , I have tried the kernel and dtb patch in nano and xavier nx and there were no improvements. I have added the code snippet of the dtb in nano, sdhci@700b0400 { status = “okay”; /delete-property/ keep-power-in-suspend; /delete-property/ non-removable; cd-gpios = <&gpio TEGRA_GPIO(Z, 2) 0>; …

UHS 1 SD card not detected on nano

Robotics & Edge Computing Jetson Systems Jetson Nano

WayneWWW July 30, 2020, 2:39am 5

Hi,

Or you could reply the question and try below patch

Does the custom carrier board support power cycling for SD slot supply on warm boot? I mean is there an extra gpio working a sdmmc_vdd_en here?

If not, are you sure your build has

the WAR to bypass CMD11 in kernel image (Jetson Nano SD card enters back to high speed mode instead of uhs mode after soft reboot)
has “nvidia,vmmc-always-on” in the dt?

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UHS 1 SD card not detected on nano

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