U-Boot could then read multiple memory pages at a
time when reading the image from the SD card. Because
this modification is internal to U-Boot, it will not degrade
the performance of applications that use the SD card
after fast boot. If RAM pages are stored consecutively
on the SD card, both pages can transfer to RAM without
the need to change the target destination address and
restart a transfer. This flexibility makes it possible to exploit
hardware data prefetching and reduce the overhead
from SD card handshaking.