cpu/mpc83xx/cpu_init.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c
index fb184d8..3a9a302 100644
--- a/cpu/mpc83xx/cpu_init.c
+++ b/cpu/mpc83xx/cpu_init.c
@@ -59,6 +59,8 @@ static void config_qe_ioports(void)
  */
 void cpu_init_f (volatile immap_t * im)
 {
+	u32 tmp_sicrh = 0;
+
 	/* Pointer is writable since we allocated a register for it */
 	gd = (gd_t *) (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET);
 
@@ -181,7 +183,11 @@ void cpu_init_f (volatile immap_t * im)
 
 	/* System General Purpose Register */
 #ifdef CFG_SICRH
-	im->sysconf.sicrh = CFG_SICRH;
+#if defined(CONFIG_MPC834X) || defined(CONFIG_MPC8313)
+	/* regarding to MPC34x manual rev.1 bits 28..29 must be preserved */
+	tmp_sicrh = im->sysconf.sicrh & 0x0000000C;
+#endif
+	im->sysconf.sicrh = CFG_SICRH | tmp_sicrh;
 #endif
 #ifdef CFG_SICRL
 	im->sysconf.sicrl = CFG_SICRL;