How to configure the Xavier to SDIO DDR50 Mode

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
#1

Hello,
What are the changes we need to make in order to configure my xavier to SDIO in DDR50 mode.

I have made the uhs-mask value to 0x08 in dts file which is working in SDR104
I want configure to DDR50 what should be the uhs-mask value and is there any other changes required to make in work in DDR50 mode.

Thanks.

#3

Hi,
Please refer to

kernel/nvidia/Documentation/devicetree/bindings/mmc/sdhci-tegra.txt

- uhs-mask: Specify modes that are masked for the device
22 	Mask HS200 mode: 0x20
23 	Mask HS400 mode: 0x40
24 	Mask SDR104 mode: 0x10
25 	Mask SDR50 mode: 0x4
26 	Mask DDR50 mode: 0x8
#4

I cheeked it already but current in my dts uhs-mask value in dts file is 0x08 still it is detected as the SDR104 ?? and when i put the 0x8 device itself is not booting ?? what should be the value for the DDR50 ??

Also do we need to any other changes required??
as i can see the sd-uhs-sdr104/sdr50/sdr25 are defined in the dts(I converted the dtb to dts) file but sd-uhs-ddr50 is not defined there do we need to make any other changes?

#5

Hi,
Please check
TX2 NX cannot access SD card via SDR104 - #2 by WayneWWW
And try to mask other modes and leave DDR50 unmasked. See if it works.

#6

Hi,
Sorry that above comment is not correct. We don’t support DDR50 on Xavier. Please check Table 10.4 in technical reference manual of Xavier:
https://developer.nvidia.com/embedded/downloads#?search=trm

#7

Thanks,But is it also mentioned we can software can enable DDR50 can you please help in this how enable ?? like uhs-mask value and if any other changes required ??

#8

Hi,
Will check with our teams and see if this can be supported. Do you use Jetpack 4 or 5?