This option controls the buffer size used for transfers to and from the
FET. Increasing it will improve transfer times, but may cause problems
with some chips.
Also, the default request size used for several commands has been
increased to take advantage of this.
The FET silently drops flash memory write requests which are not
address or length aligned to a word boundary.
Based on a patch by Sören Höckner <soeren.hoeckner@gmx.de>.