Cannot mount Sony Ericsson mobile phone, msdosfs too restrictive?

[Dennis Melentyev]

Well, had the same problem.
For me, it looks like SE is using FAT12 (!!!Not 16!!!) on a devive
larger than 32MB. Could have something slipped off my mind, but quite
close. It is a BROKEN msdosfs on a stick.

Just re-formated 1Gb flash with FAT32 using card reader and both K750i
and FreeBSD are happy.

2007/7/1, Raaf <raaf at zen.mooo.com>:
> Hi, i got a Sony Ericsson mobile phone that came with a pre-formatted
> memory stick that i'm unable to mount in FreeBSD (it mounts fine in
> Linux).
>
> After investigating i found out that the FreeBSD msdsofs driver bails
> out on the following code (the pmp->pm_Heads being zero):
>
> ----------------------------------
> if (!pmp->pm_BytesPerSec || !SecPerClust
>                 || !pmp->pm_Heads
> #ifdef PC98
>                 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
> #else
>                 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
> #endif
>                 error = EINVAL;
>                 goto error_exit;
>         }
> ----------------------------------
>
> Removing the check for pmp->pm_Heads fixes it for me.
>
> Is the check for pmp->pm_Heads really necessary?
>
> Grepping through the msdosfs sources i can only see it being used for
> validation and not used in any calculation (the same applies for the
> pmp->pm_SecPerTrack value)
>
>
> --- sys/fs/msdosfs/msdosfs_vfsops.c.orig        Sun Jul  1 20:42:14 2007
> +++ sys/fs/msdosfs/msdosfs_vfsops.c     Sun Jul  1 20:46:57 2007
> @@ -483,7 +483,6 @@
>
>         /* XXX - We should probably check more values here */
>         if (!pmp->pm_BytesPerSec || !SecPerClust
> -               || !pmp->pm_Heads
>  #ifdef PC98
>                 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
>  #else
>
>
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-- 
Dennis Melentyev