Cross compiling mtd-utils for Android and pread errors

Jon Povey Jon.Povey at
Tue Nov 2 06:11:41 EDT 2010

Ketil Froyn wrote:
> On Fri, Oct 29, 2010 at 3:18 PM, Jon Povey
> <Jon.Povey at> wrote:
>> linux-mtd-bounces at wrote:
>>> pread: Not a typewriter / #
>>> I'm grateful for any tips that can nudge me in the right direction.
>> "Not a typewriter" is ENOTTY, i.e. ioctl not supported.
>> Seems your android mtd devices don't support those ioctls.
> Hi Jon,
> Thanks for the response! I only get ENOTTY when dumping to file, but
> not when I try to dump output to a tty using:
> /sdcard/nanddump -a /dev/mtd/mtd0
> so it almost seems that the program is confused and tries to treat the
> output file like a tty when I run with -f.

strace can tell you what ioctl is failing on what file descriptor.

Happy sleuthing.

Jon Povey
jon.povey at

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