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Re: Possibly erroneous "device not present" message during boot




On 04/12/2017 02:03 PM, Pascal Hambourg wrote:
Le 12/04/2017 à 20:33, Richard Owlett a écrit :
On 04/12/2017 12:13 PM, Pascal Hambourg wrote:

[snip]
- while the SD card is inserted, in the GRUB menu press "c" to enter a
GRUB shell and report the result of the "ls" command.

(hd0) (hd0, msdos9) (hd0, msdos8) (hd0, msdos7) (hd0, msdos6)
(hd0, msdos5) (hd0, msdos1) (hd1) (hd1, msdos1)

Some BIOS expose a removable media only when booting from it, so my
theory was that your BIOS did not expose the SD card and GRUB could
not see it. The result of ls proves me wrong.

Can you also report the output of "ls (hd1,msdos1)" to check what GRUB
sees of the partition on the card ?

It gives the partitioning description, UUID, and label of the USB flash drive that was plugged in. It is FAT formatted and used to exchange information with my Windows machine.


Any suggested reading on the "BASH like shell" I just used?

The GRUB manual at <https://www.gnu.org/software/grub/manual/grub.html>

It was what prompted me to ask ;/

describes some of the commands, but not all. The shell can display the
command list with "help" and information about a specific command with
"help <command>".