SD card reader SD support

Hardware Librem 5
1

Dear @dos
have you know if Librem 5 support: SDR104 mode or any?

Thanks

2 Likes
2

OK. I can confirm that Librem 5 SOC support SDR104 however i not sure if exist a bottleneck in the Librem 5 scheme.

So i really recommend to use a SDcard U1 V30 A1+ for Librem 5. A1 is first features to manager a operating system. V30 is first feature to manager video writer. U1 is first features to manager Utra High Speed Bus.

So i recommend to use this sdcard ONLY for Librem 5: https://www.raspberrypi.com/documentation/accessories/sd-cards.html

1 Like
3

This doesn’t seem to take into account what has been discussed previously: Why is internal card reader so slow? - #6 by Privacy2. Some of the L5 components limit speeds and card standards, so yes, there is a bottleneck.

2 Likes
4

Yes i remember that thread/post however if the test was on wrong sdcard then the bottleneck may be come from SDcard. I just say.

Of course i will full brakedown to see whats going on.

1 Like
5

@JR-Fi I brakedown a little and yes the usb2.0(shame) controller it is the bottleneck for SDR104 via sd-slot however the soc still support it via M.2. :smiling_face_with_tear:

Thank you.

2 Likes
6

Still brakedown SDR104 until i have it all clear… So yes as what i say Librem 5 soc support SDR104 via sdio v3.0, in fact sdr104 it may in use via WLAN. So what i looking is if we use it a SDR104+A2 SDcard even with the bottleneck, we may have some features like powersave, more speed like 30MBps or 45MBps, and a better .img managements on sdcard.
I just saying… At the moment of the research is in theoretically nothing in testing…

1 Like