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| author | phk <phk@FreeBSD.org> | 2003-01-15 20:15:33 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 2003-01-15 20:15:33 +0000 |
| commit | 8f6000a750e0051af7354333f8f1edc6e46a9405 (patch) | |
| tree | 599afa8b7627da158de097a297ac0b9ded4f6a9b /sys/i386/conf | |
| parent | a7f59810e1b32b1a343c945ea8c1ddd5d10d098f (diff) | |
| download | FreeBSD-src-8f6000a750e0051af7354333f8f1edc6e46a9405.zip FreeBSD-src-8f6000a750e0051af7354333f8f1edc6e46a9405.tar.gz | |
Add machdep.elan_freq sysctl which can be used to set the CPU clock
frequency in Hz. The default is still 33.333 MHz. Please notice
that the number is round to a multiple of four internally so it may
not read back exactly the same as written.
Add compile time ELAN_XTAL option to override the 33.333 MHz default.
Add compile time ELAN_PPS option to enable code for high precision
(250 nanoseconds) timestamping of external signals.
Diffstat (limited to 'sys/i386/conf')
| -rw-r--r-- | sys/i386/conf/NOTES | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES index 07a5e25..9f63519 100644 --- a/sys/i386/conf/NOTES +++ b/sys/i386/conf/NOTES @@ -90,6 +90,8 @@ cpu I686_CPU # aka Pentium Pro(tm) # I/O device(s). # # CPU_ELAN enables support for AMDs ElanSC520 CPU. +# ELAN_XTAL sets the clock crystal frequency in Hz +# ELAN_PPS enables precision timestamp code. # # CPU_ENABLE_SSE enables SSE/MMX2 instructions support. This is default # on I686_CPU and above. @@ -165,6 +167,8 @@ options CPU_BTB_EN options CPU_DIRECT_MAPPED_CACHE options CPU_DISABLE_5X86_LSSER options CPU_ELAN +options ELAN_XTAL=32768000 +options ELAN_PPS options CPU_ENABLE_SSE #options CPU_DISABLE_SSE options CPU_FASTER_5X86_FPU |
