|  | menu "Library routines" | 
|  |  | 
|  | config CC_OPTIMIZE_LIBS_FOR_SPEED | 
|  | bool "Optimize libraries for speed" | 
|  | help | 
|  | Enabling this option will pass "-O2" to gcc when compiling | 
|  | under "lib" directory. | 
|  |  | 
|  | If unsure, say N. | 
|  |  | 
|  | config HAVE_PRIVATE_LIBGCC | 
|  | bool | 
|  |  | 
|  | config USE_PRIVATE_LIBGCC | 
|  | bool "Use private libgcc" | 
|  | depends on HAVE_PRIVATE_LIBGCC | 
|  | help | 
|  | This option allows you to use the built-in libgcc implementation | 
|  | of U-boot instead of the one privided by the compiler. | 
|  | If unsure, say N. | 
|  |  | 
|  | config OF_LIBFDT_OVERLAY | 
|  | bool "Enable the FDT library overlay support" | 
|  | help | 
|  | This enables the FDT library (libfdt) overlay support. | 
|  |  | 
|  | config SYS_HZ | 
|  | int | 
|  | default 1000 | 
|  | help | 
|  | The frequency of the timer returned by get_timer(). | 
|  | get_timer() must operate in milliseconds and this option must be | 
|  | set to 1000. | 
|  |  | 
|  | endmenu |