Re: How to install grub onto an added drive?

[Pascal Hambourg]

Le 18/11/2019 à 20:33, Chris Green a écrit :
> On Mon, Nov 18, 2019 at 08:20:44PM +0100, Pascal Hambourg wrote:
> > You cannot mark a whole drive as bootable. You can mark a primary partition
> > as bootable, but this is needed only with broken firmwares which require it.
> > A compliant BIOS does not require a bootable partition.
> Ah, OK, I hadn't realised that (that marking bootable isn't
> necessary). 

IF the BIOS is compliant.

> How does the BIOS decide what disk to boot from then,
> does it search for the MBR signature?

Yes, but any disk with a DOS or GPT partition table has the MBR 
signature, and not all MBR contain a boot code. Usually, the boot 
preference order is defined in the BIOS setup.

> > Update fstab and the initramfs.
> OK, fstab is easy enough.  Do I just run update-initramfs for the
> initramfs?

Yes, if the initramfs generator is initramfs-tools, with -u (update). 
With default options (MODULES=most in /etc/initramfs-tools/), the 
existing initramfs should already include NVMe support.