Hi Alan :)
* Alan Stern <[EMAIL PROTECTED]> dixit:
> On Wed, 5 Jul 2006, DervishD wrote:
> > If udev is enabled in the machine, the device seems to be
> > detected four times: the first two it is found to be write protected,
> > the last two it is NOT write protected. Under Ubuntu, hald gets the
> > information from the first time it is detected, finds that the device
> > is write protected and mounts it as read-only. That's annoying
> > because I have to remount it by hand.
> >
> While I don't know what's going on with hald or udev, the log itself is
> pretty clear.
>
> The device tells the computer that it has removable media, like a CDROM
> drive or a card reader. (Why an MP3 player would do this is beyond me.)
I think I have the answer for that: I think there is another
model of the same brand with support for a external SD card. Probably
they share firmware...
> During the first two polls it reports that the media is write-protected.
> But then after you go to mount it, it reports that the media has been
> changed (like putting in a new CD or a new memory card) and the new media
> is _not_ write protected. Of course all this "media change" stuff is pure
> fiction, but that's what the device says and the kernel believes it.
In a 2.4 kernel, all I have to do (I discovered it after this
message) is to umount and remount again as an ordinary user. The
second time the device is detected properly as write-enabled :)
> Don't ask me why it does this. Maybe it needs some time to "warm
> up" and during that time it doesn't want to accept WRITE commands.
> If that's true, then all you need to do is delay mounting it for
> some five or six seconds. Or maybe it doesn't change its mind
> until after getting a bunch of READ commands. Who knows?
I think that the cause may be a crappy firmware that is expecting
for a SD card to be inserted and settled. Of course, since this
device doesn't have support for SD card, that never happens. Probably
other OSes are just polling the device waiting for a "media change",
who knows.
The device itself doesn't need any time to settle or warm up,
I've tested that. I think that the real cause is crappy firmware.
This INOVIX mp3 players aren't bad at all, but they're cheap and
probably the firmware is as cheap :( They're firmware upgradeable,
but upgrades may be even cheaper ;)
Thanks A LOT for your interest and work. You finally solved my
problem, because knowing that all I have to do is "repoll" the
device, a symple "mount /media/mp3; umount /media/mp3; mount
/media/mp3" does the job for my 2.4 kernel! Thank you very much :)
I'll post a message in lkml about the issue, just in case someone
had a similar problem.
If you ever come to Spain, I promise I'll buy you all the beer
you can drink (or whatever you want to drink instead of beer, of
course XDD).
Raúl Núñez de Arenas Coronado
--
Linux Registered User 88736 | http://www.dervishd.net
http://www.pleyades.net & http://www.gotesdelluna.net
It's my PC and I'll cry if I want to... RAmen!
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