+them. It used to have the ability to change the buffer size from the
+default of 4096 bytes to an arbitary value, however for some time the
+Pi Foundation have compiled the SPI device driver into the kernel and
+this has fixed the buffer size. The way to change it now is to edit
+the /boot/cmdline.txt file and add on spdev.bufsiz=8192 to set it to
+e.g. 8192 bytes then reboot.
+
+Note that on a Pi with a recent 3.18 kernel with the device-tree structure
+enable, the load may fail until you add:
+
+.I dtparam=spi=on
+
+into \fB/boot/config.txt\fR to allow user use of the I2C bus.