ADLINK ReadyBoard 740 - Manual (Page 37)

BIOS Setup 25
RB-740
Max CPUID Value Limit
When enabled, allows legacy operating systems to support
processers with extended CPUID functions.
Execute-Disable Bit Capability
Intel¡¦s Execute Disable Bit functionality can help prevent cer-
tain classes of malicious buffer overflow attacks when com-
bined with a supporting operating system. Execute Disable Bit
allows the processor to classify areas in memory where appli-
cation code can execute and where it cannot. When a mali-
cious worm attempts to insert code in the buffer, the processor
disables code execution, preventing damage and worm propa-
gation.
Set this value to disabled to force the XD feature flag to always
return 0. Default is enabled.