Both 486 and Pentium processors have an internal on-chip cache and an
optional external cache. boot can control the cache behaviour
with the cache bootstring. The following options are
available:
/d
Disable flushing the cache. Booting will take less time if flushing
is disabled. However, this may cause some machines to incorrectly
size memory or fail to boot.
/e
Enable flushing the cache (default).
/n
Switch off the cache before loading the kernel. This may be necessary
for some machines which have problems with cache coherence
(this occurs when DMA does not notify the internal cache
that memory has been written to directly).
/y
Switch on the cache after the kernel is loaded (default). Machine
performance is enhanced if caching is enabled.