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Should result in native speed for plain read and erase.
Should result in a measurable speedup for writes due to a fast verify.
Packet size is 512 bytes. Depending on your USB hardware and the
Dediprog firmware version, this may not work at all. That said, it
worked on the hardware we tested.

Add lots of error checking where it was missing before.

Thanks to Richard A. Smith, Mathias Krause and David Hendricks for
testing multiple iterations of this patch.

Corresponding to flashrom svn r1234.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Richard A. Smith <richard@laptop.org>
Acked-by: Mathias Krause <mathias.krause@secunet.com>