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

Le 19/04/2017 à 00:27, Brian a écrit :
On Wed 19 Apr 2017 at 00:12:15 +0200, Pascal Hambourg wrote:

Le 18/04/2017 à 21:14, Brian a écrit :

However, my main point was that the kernel
identifying a card as a /dev/sdX disk does not imply it will necessarily
be visible to GRUB and bootable by it.

If the card reader is idendified as /dev/sdX, then it probably behaves as a
generic USB mass storage device and most BIOS can see it.

A card in one of the slots of my card reader is identified as /dev/sdc1.
The reader itself is seen by lsusb. The BIOS doesn't see it and does not
have an option to boot from it. So I suppose my reader is not "most
BIOS". What is it behaving as?

How does lsusb identify the card reader ? What driver/module does it use ? "lsusb -t" will tell both.

If it uses usb-storage and the BIOS can boot from a USB device, then it surprises me that the BIOS cannot see and boot it when it contains a card with proper contents.