[PATCH] Fix for USB media not found at boot

[Hans Petter Selasky]

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.

--HPS

On Thursday 05 November 2009 04:34:33 Chao Shin wrote:
> 在 Sun, 04 Oct 2009 07:52:45 +0800，Scott Long <scottl at 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
> >
> >
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