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

[Angus Ainslie]

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

https://source.puri.sm/Librem5/librem5-devkit-tools

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

Cheers

Angus



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