Re: keyboard problem with 2.6.6

[Sau Dan Lee]

>>>>> "Valdis" == Valdis Kletnieks <Valdis.Kletnieks@xxxxxx> writes:

    Valdis> On Fri, 04 Jun 2004 22:33:41 +0300, Denis Vlasenko said:
    >> Using shell scripts instead of 'standard' init etc is way more
    >> configurable. As an example, my current setup at home:
    >> 
    >> My kernel params are:

    Valdis> Yes. Those are *YOUR* config setup parameters, that happen
    Valdis> to work with *your* specific configuration when everything
    Valdis> is operational. Some problems:

    Valdis> 1) Not all the world uses initrd....

Does ever /etc/rcS.d/* require initrd?

Moreover, not all the world uses a keyboard, either.



    Valdis> 2) I hope your /script/mount_root will Do The Right Thing
    Valdis> if the mount fails because it needs an fsck, for example.
    Valdis> Answering those 'y' and 'n' prompts can be a problem if
    Valdis> your keyboard isn't working yet..

Things even worse  can happen, too, such as  harddisk dying.  In those
problematic situations,  you'd rather boot a failsafe  partition, or a
rescue floppy, or Knoppix CD.


    Valdis> 3) Bonus points if you can explain how to, *without* a
    Valdis> working keyboard, modify that /linuxrc on your initrd to
    Valdis> deal with the situation where your keyboard setup is wrong
    Valdis> (think "booting with borrowed keyboard because your usual
    Valdis> one just suffered a carbonated caffeine overdose")...

How  do you  do the  same if  you had  only SCSI  disks, but  the SCSI
modules are not loaded or compiled in?


    Valdis> There's a *BASIC* bootstrapping problem here - if you move
    Valdis> "initialize and handle the keyboard" into userspace, you
    Valdis> then *require* that a significantly larger chunk of
    Valdis> userspace be operational in order to be able to even type
    Valdis> at the machine.  If you're trying to recover a *broken*
    Valdis> userspace, it gets a lot harder.


    Valdis> And the embedded people who use
    Valdis> "init=/onlyprogramthateverruns" are going to have a
    Valdis> significant collective cow about this....

Does embedded systems always have a keyboard?




-- 
Sau Dan LEE                     ???(Big5)                    ~{@nJX6X~}(HZ) 

E-mail: danlee@xxxxxxxxxxxxxxxxxxxxxxxxxx
Home page: http://www.informatik.uni-freiburg.de/~danlee

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