Date: Tue, 10 Nov 2009 10:16:20 -0800 From: Xin LI <delphij@delphij.net> To: Hans Petter Selasky <hselasky@c2i.net> Cc: Marcel Moolenaar <xcllnt@mac.com>, re@FreeBSD.org, Chao Shin <quakelee@geekcn.org>, freebsd-current@freebsd.org Subject: Re: [PATCH] Fix for USB media not found at boot Message-ID: <4AF9ADF4.5040601@delphij.net> In-Reply-To: <200911050922.10205.hselasky@c2i.net> References: <20091002150931.K35591@pooker.samsco.org> <30F3E66A-4A69-46CE-96F4-44B4049722E2@samsco.org> <op.u2wj7poohnq548@qld630> <200911050922.10205.hselasky@c2i.net>
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Hans Petter Selasky wrote:
> Hi,
>
> There is a newer patch in USB P4.
>
> The problem is when the /usr partition for example is not residing on the root
> disk, which is the only disk the code is waiting for. Then the patch will make
> the bootup fail.
What if we teach rc.d scripts to do something like this:
do {
mount -a && break;
sleep 1; counter++;
} while counter < 30?
Will this make sense? Or is there any other concerns?
> --HPS
>
> On Thursday 05 November 2009 04:34:33 Chao Shin wrote:
>> 在 Sun, 04 Oct 2009 07:52:45 +0800，Scott Long <scottl@samsco.org> 写道:
>>
>> Hi all
>>
>> Is there any newer patch/workarounds available?
>>
>>> On Oct 3, 2009, at 12:51 PM, Marcel Moolenaar wrote:
>>>> On Oct 3, 2009, at 9:00 AM, Hans Petter Selasky wrote:
>>>>> On Saturday 03 October 2009 17:05:35 Scott Long wrote:
>>>>>> On Oct 3, 2009, at 4:30 AM, Hans Petter Selasky wrote:
>>>>>>> On Saturday 03 October 2009 10:19:57 Scott Long wrote:
>>>>>>>> config_intrhook system will sleep after all
>>>>>>> Then why do you need the intr hook callback?
>>>>>> The config_intrhook lets you know that interrupts are enabled, the
>>>>>> scheduler is running, and mountroot hasn't run yet. It provides a
>>>>>> very convenient and standard way to do exactly what we want with USB
>>>>>> enumeration.
>>>>> Hi,
>>>>>
>>>>> The root HUB attach and explore code is already running from a separate
>>>>> thread, so won't that be superfluous? I mean, the HUB explore code for
>>>>> any USB
>>>>> HUB will not run until the scheduler is running anyway.
>>>>>
>>>>> In my opinion delaying the system until the boot disk is present is
>>>>> just not
>>>>> good. We should rather be event driven, so that every time a new disk
>>>>> becomes
>>>>> present it checks it for mountroot.
>>>>>
>>>>> while (1) {
>>>>> if (mountroot is successful)
>>>>> break;
>>>>> if (ctrl+c is pressed)
>>>>> manual_mountroot();
>>>>> printf("Waiting 1 second for root-disk to appear. Press CTRL+C to
>>>>> abort.\n");
>>>>> sleep(1);
>>>>> }
>>>> Yes.
>>>>
>>>> The mount root code should keep a list of potential root devices to try
>>>> and
>>>> it should try a device as soon as it appears. The current approach to
>>>> block
>>>> the root mount simply because we want everything to be discovered
>>>> before we
>>>> try to mount the root is preventing fast boots -- such as when the root
>>>> is
>>>> a memory disk and you don't need to wait for anything...
>>>>
>>>> Put differently: it's rather odd to hold off the root mount when the
>>>> root
>>>> device is already present...
>>>>
>>>> An approach like this also allows one to indefinitely wait for the root
>>>> device, which is a good feature to have...
>>> When /etc/rc tries to mount everything in the fstab, it'll fail the boot
>>> if some of the devices haven't arrived in time. An argument can be made
>>> for fixing that as well, but we're starting to get beyond on the scope
>>> of fixing what is needed for 8.0-RELEASE.
>>>
>>> Scott
>>>
>>>
>>> _______________________________________________
>>> freebsd-current@freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-current
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>>> "freebsd-current-unsubscribe@freebsd.org"
>
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- --
Xin LI <delphij@delphij.net> http://www.delphij.net/
FreeBSD - The Power to Serve! Live free or die
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