have you tried, for the sake of testing, to bypass the shell at boot and go
to UEFI menu and select boot manager and see devices that are available?
make sure that a formatted sd card is in the slot at power on. also, this
is a good reference site, if you had not found it yet,
https://minnowboard.org/tutorials/installing-ubuntu-16.04-on-minnowboardmax

On Wed, Jul 19, 2017 at 11:42 PM, Asharaf Perinchikkal <
asharaf.perinchik...@quest-global.com> wrote:

> I am using Class 10 SanDisk SD card with 32GB.
> After Installation Its not possible to detect SD card from UEFI shell even
> when i  tried with another SD card.
>
> For Testing purpose I have tried to inserted another SD card(Strontium
> 16GB) with Ubuntu 16.04 bootable disk After that UEFI shell not available,
> display is blank.
> Even after removing SD card display remains blank. UEFI shell not seen.
> Could you please suggest a recovery method.
>
> *From:* elinux-MinnowBoard [elinux-minnowboard-boun...@lists.elinux.org]
> on behalf of Jesus Velazquez [jjv...@gmail.com]
> *Sent:* Wednesday, July 19, 2017 7:30 PM
> *To:* MinnowBoard Community Email List
> *Subject:* Re: [MinnowBoard] SD card booting issue in MinnowBoard Turbot
> Quad-Core
>
> Did you try with another SD card?
> What size your SD card have?
>
> El 19/07/2017, a las 07:32, Asharaf Perinchikkal <
> asharaf.perinchik...@quest-global.com> escribió:
>
> Hi All,
>
> This is regarding SD card booting issue in MinnowBoard Turbot Quad-Core,
> Dual Ethernet board.
>
> We have installed Ubuntu 16.04 from USB drive to SD card as per steps in
> the link https://minnowboard.org/tutorials/installing-ubuntu-
> 16.04-on-minnowboardmax/after-the-automated-installation-completes.But we
> are not possible to boot from SD card. It seems SD card is not detected.
>
> When we tried to accesses sd card using command
>     fs0: It shows an error "FS0 is not a valid mapping"
>
> Expecting your support to resolve the sdcard booting issue.
>
> Regards
> Asharaf P
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