On Friday 18 April 2014 10:01:35 Brian Hesdorfer wrote: > On 4/18/2014 9:05 AM, Joost Roeleveld wrote: > > 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/r > > e58.html > > > > I used this myself in the past when booting from USB-devices. > > > > Kind regards, > > > > Joost > > Tiny Core linux, which is primarily booted over usb, does something > similar. If I'm understanding this right, they have a loop in their > initrd that just waits a maximum of X seconds until it shows up. > > I'm not sure how easy this would be to move into something else. > > Lines 114-128: > http://git.tinycorelinux.net/index.cgi?url=Core-scripts.git/tree/etc/init.d/ > tc-config
" rootdelay " is a standard linux kernel option. No need to use a special script. -- Joost
