[Librem-5-dev] U-Boot support for uSD

Angus Ainslie angus.ainslie at puri.sm
Thu Dec 27 04:40:44 PST 2018

Hi Andy,

On 2018-12-27 12:09 a.m., Andy Green via Librem-5-dev wrote:
> Hi -
> It seems my reasonably midrange for 2018 uSD (Sandisk Ultra U1 32GB)
> cannot be brought up by U-Boot on the dev board.
>  u-boot=> mmc dev 1
>  Card did not respond to voltage select!
>  mmc_init: -95, time 29
> But there's no evident problem using that card on a Linux box via a
> cheapo USB adapter.
> "Just me"?  Known issue not on the list of known issues[1]?  Any
> recommended cards that do work?
> (Please don't send me to some non-scalable "chat"... let's get the
> answer on the ml and in google... maybe even in the docs...)
If you are testing kernel changes you can use the SDP and an initramfs.

Check this page


Using the  "Create the initramfs" instructions you can specify a kernel
path to get the modules from. Then copy the kernel "Image" into the
files sub-directory and then use uuu ( SDP ) to upload and run all of it.

sudo uuu uuu_scripts/test_librem5.lst



> Thanks...
> -Andy
> [1]
> https://developer.puri.sm/Librem5/Development_Environment/Boards/Known_Issues.html
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