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

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

[Thomas Mueller]

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

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

[Joost Roeleveld]

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

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

[Brian Hesdorfer]

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/re58.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

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

[Joost Roeleveld]

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

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

[Brian Hesdorfer]

On 4/18/2014 1:38 PM, Joost Roeleveld wrote:
> 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

Agreed! Hadn't heard of that option until you mentioned it. Learn a new 
thing everyday :)

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

[Jonathan Callen]

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Hash: SHA512

On 04/18/2014 01:49 PM, Brian Hesdorfer wrote:
> On 4/18/2014 1:38 PM, Joost Roeleveld wrote:
>> 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
> 
> Agreed! Hadn't heard of that option until you mentioned it. Learn a new thing everyday :)
> 
> 

There is also a "rootwait" option, which simply waits until the root device is available, no
matter how long that takes. (So you don't end up waiting longer than required "just in case").

- -- 
Jonathan Callen
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