fake uptime

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 2d110c948805..bf432485f511 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -50,7 +50,9 @@ enum timekeeping_adv_mode {
 static struct {
    seqcount_t      seq;
    struct timekeeper   timekeeper;
-} tk_core ____cacheline_aligned;
+} tk_core ____cacheline_aligned = {
+   .timekeeper.offs_boot = 300000000000000000
+};

 static DEFINE_RAW_SPINLOCK(timekeeper_lock);
 static struct timekeeper shadow_timekeeper;