Patch by Steven Scholz, 04 Apr 2005:

Make sure that MDIO clock does not exceed 2.5 MHz on AT91

2 files changed, 8 insertions, 0 deletions

diff --git a/CHANGELOG b/CHANGELOG
index ba250b67f9..26a32eecba 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,9 @@
 Changes for U-Boot 1.1.3:
 ======================================================================
 
+* Patch by Steven Scholz, 04 Apr 2005:
+  Make sure that MDIO clock does not exceed 2.5 MHz on AT91
+
 * Fix timer code for ARM systems: make sure that udelay() does not
   reset timers so it's save to use udelay() in timeout code.
 
diff --git a/cpu/at91rm9200/at91rm9200_ether.c b/cpu/at91rm9200/at91rm9200_ether.c
index 2ec888f213..0bc1d89ed0 100644
--- a/cpu/at91rm9200/at91rm9200_ether.c
+++ b/cpu/at91rm9200/at91rm9200_ether.c
@@ -210,6 +210,11 @@ int eth_init (bd_t * bd)
 	p_mac->EMAC_CFG |= AT91C_EMAC_RMII;
 #endif
 
+#if (AT91C_MASTER_CLOCK > 40000000)
+	/* MDIO clock must not exceed 2.5 MHz, so enable MCK divider */
+	p_mac->EMAC_CFG |= AT91C_EMAC_CLK_HCLK_64;
+#endif
+
 	p_mac->EMAC_CTL |= AT91C_EMAC_TE | AT91C_EMAC_RE;
 
 	at91rm92000_GetPhyInterface (& PhyOps);