freebsd stable - Jan 2014 - How to make boot wait a few seconds more for device response?

How do I make boot wait a few seconds more if it can't mount the root device
immediately?

Device in question is a USB 3.0 USB stick, 32 GB where I installed FreeBSD
10-prerelease i386.

Booting process can't mount the root device fast enough, and I get
mountroot> prompt.

I have succeeded every time in booting, sometimes after several attempts due to
not knowing the ddevice name/number. Being able to enter

ufs:/dev/gpt/FB10USB3i386-root

helps, especially when more than one USB stick is present, and enables me to get
it correct the first time.

But it still is annoying, and I would like to avoid this extra step, if
possible.  It seems like a matter of a USB stick not responding as fast as a
hard drive, or maybe this USB 3.0 stick is slower for initial response than USB
2.0 sticks..  So how do I tell the system to allow several seconds more?

Relevant kernel messages are:

Dec 29 21:23:09 amelia4 kernel: ugen1.7: <vendor 0x0cf3> at usbus1
Dec 29 21:23:09 amelia4 kernel: Root mount waiting for: usbus1
Dec 29 21:23:09 amelia4 kernel: (probe0:umass-sim0:0:0:0): INQUIRY. CDB: 12 00 0
0 00 24 00
Dec 29 21:23:09 amelia4 kernel: (probe0:umass-sim0:0:0:0): CAM status: CCB reque
st completed with an error
Dec 29 21:23:09 amelia4 kernel: (probe0:umass-sim0:0:0:0): Retrying command
Dec 29 21:23:09 amelia4 kernel: ugen1.8: <ATHEROS> at usbus1
Dec 29 21:23:09 amelia4 kernel: Trying to mount root from ufs:/dev/gpt/FB10USB3i
386-root [rw]...
Dec 29 21:23:09 amelia4 kernel: mountroot: waiting for device /dev/gpt/FB10USB3i
386-root ...
Dec 29 21:23:09 amelia4 kernel: (probe0:umass-sim0:0:0:0): INQUIRY. CDB: 12 00 0
0 00 24 00
Dec 29 21:23:09 amelia4 kernel: (probe0:umass-sim0:0:0:0): CAM status: CCB reque
st completed with an error
Dec 29 21:23:09 amelia4 kernel: (probe0:umass-sim0:0:0:0): Retrying command
Dec 29 21:23:09 amelia4 kernel: Mounting from ufs:/dev/gpt/FB10USB3i386-root fai
led with error 19.


But I am then able to mount this device/partition from mountroot> prompt.

By the way, I also notice some instabilities with USB; this is on FreeBSD
10-prerelease amd64 as well as i386:

 ugen1.4: <Logitech> at usbus1 (disconnected)
ums0: at uhub6, port 2, addr 4 (disconnected)
ugen1.4: <Logitech> at usbus1
ums0: <Logitech USB Optical Mouse, class 0/0, rev 2.00/34.01, addr 4> on
usbus1
ums0: 8 buttons and [XYZT] coordinates ID=0

though this mouse is actually connected and responsive all the time.

I just checked for 9.2-STABLE amd64 and 11-HEAD i386 and amd64: these USB
mouse-related messages don't occur.  Now I'm afraid to upgrade to 10.0
on computer where 9.2-STABLE is installed and re(4) works OK.  11-HEAD is
stabler than 10-prerelease?

FreeBSD version on computer with newer MSI Z77 MPOWER motherboard is
10.0-prelease from about the time of RC3:

FreeBSD amelia4 10.0-PRERELEASE FreeBSD 10.0-PRERELEASE #3: Mon Dec 30 01:38:00
UTC 2013     root at amelia4:/usr/obj/usr/src/sys/SANDY10  amd64

Tom

On 04.01.2014 14:11, Thomas Mueller wrote:
> How do I make boot wait a few seconds more if it can't mount the root
device immediately?
Just add to your /boot/loader.conf:

kern.cam.boot_delay="10000"

The value counts miliseconds.