Documentation updates.

git-svn-id: http://svn.digium.com/svn/zaptel/branches/1.4@3626 5390a7c7-147a-4af0-8ec9-7488f05a26cb

1 files changed, 8 insertions, 4 deletions

diff --git a/README b/README
index 0641d73..a62302b 100644
--- a/README
+++ b/README
@@ -96,16 +96,20 @@ If you build a custom kernel, note the following configuration items:
 - CONFIG_CRC_CCITT must be enabled ('y' or 'm'). On 2.6 kernels this can 
   be selected These can be selected from the "Library Routines" submenu 
   during kernel configuration via "make menuconfig".
-- If you don't have any zaptel hardware, you need ztdummy.
+- If you don't have any zaptel hardware, you need ztdummy. ztdummy takes
+  its timing from the kernel. It can use either of the following:
   * ztdummy on i386/x86_64 with kernels >= 2.6.22 can (and should) use 
     high resolution times (CONFIG_HIGH_RES_TIMERS), and (if available, 
-    the system HPET.
+    the system HPET. This shows as "source: HRTimer". This is
+    recommended.
   * ztdummy on i386/x86_64 and later kernels (>= 2.6.15) can use the 
-    system's RTC (Real Time Clock).
+    system's RTC (Real Time Clock). This shows as "source: RTC".
+  * Failing that, on Linux 2.6 kernels with HZ=1000 (was the default
+    before 2.6.13). This shows as "source: Linux26".
   * Alternatives to that for ztdummy are a UHCI USB controller (USB
     controllers made by Intel or VIA) or a kernel that has HZ=1000
     (default on kernels 2.6.0-2.6.12, optional on newer kernels. Not
-    possible on 2.4).
+    possible on 2.4). This shows as: "source: UHCI".
 
 
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