Re: [gentoo-user] Allow delay for booting from USB device?

[Joost Roeleveld <joost@antarean.org>]

On Friday 18 April 2014 12:02:01 Thomas Mueller wrote:
> Is there a way to make Gentoo or other Linux allow extra time when root is
> on a USB device?  Any way to say "just a second" or more like 15 seconds
> before aborting with the message that root partition does not exist?
> 
> In this case it's an IDE hard drive in a USB enclosure.
> 
> FreeBSD seems to handle this situation better.  I would get a
> mountroot>
> prompt, to which I would respond
> ufs:/dev/ada0p3
> and be good.
> 
> I could avoid this situation with /boot/loader.conf
> 
> legal.realtek.license_ack=1
> rsu-rtl8712fw_load="YES"
> kern.cam.scsi_delay="13000"     # Delay (in ms) before probing SCSI
> kern.cam.boot_delay="16000"    # Delay (in ms) of root mount for CAM bus
> hint.re.0.disabled="1"
> 
> but don't know if Linux has anything like this.
> 
> Only lines 3 and 4 are relevant to this issue; other lines are for different
> issues.
> 
> Tom

Try adding " rootdelay = 15 "  to the kernel commandline.
This should make the kernel wait 15 seconds before trying to access the root-
device.

See:
http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/re58.html

I used this myself in the past when booting from USB-devices.

Kind regards,

Joost