[Xen-devel] [PATCH] fix the time issue on x86_64

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

For x86_64, we must have a RTC driver compiled in kernel.
I compiled a native x86_64 Linux kernel without any RTC driver support,
and the native Linux kernel also has the same time issue.
If we run hwclock, we get
        Cannot access the Hardware Clock via any known method.
        Use the --debug option to see the details of our search for an
access method.
If this command fails, /etc/rc.d/rc.sysinit can not set kernel time (by
calling syscall settimeofday()) correctly.

And after adding CONFIG_RTC to xeno64 default config file, the time
issue is gone.
But for i386, this is not a must, for it has some other way to get the
RTC time.

Following is the patch:

# This is a BitKeeper generated diff -Nru style patch.
#
# ChangeSet
#   2005/06/08 23:59:01-07:00 xin@xxxxxxxxxxxxxxxxxxxxxx
#   fix time issue bug on x86_64
#   Signed-off-by: Li B Xin <li.b.xin@xxxxxxxxx>
#   Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
#
# linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
#   2005/06/08 23:59:00-07:00 xin@xxxxxxxxxxxxxxxxxxxxxx +1 -1
#   fix time issue bug by adding RTC driver support.
#   x86_64 must have a RTC driver support, or we can not run hwclock
successfully, so we can not set a correct time to kernel.
#   Signed-off-by: Li B Xin <li.b.xin@xxxxxxxxx>
#   Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
#
diff -Nru
a/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
b/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
--- a/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
2005-06-09 00:02:32 -07:00
+++ b/linux-2.6.11-xen-sparse/arch/xen/configs/xen0_defconfig_x86_64
2005-06-09 00:02:32 -07:00
@@ -701,7 +701,7 @@
 # CONFIG_WATCHDOG is not set
 # CONFIG_HW_RANDOM is not set
 # CONFIG_NVRAM is not set
-# CONFIG_RTC is not set
+CONFIG_RTC=y
 # CONFIG_GEN_RTC is not set
 # CONFIG_DTLK is not set
 # CONFIG_R3964 is not set


thanks
-Xin

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