Patch by Steven Scholz, 04 Apr 2005:

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

diff --git a/CHANGELOG b/CHANGELOG
index ba250b6..26a32ee 100644 (file)
--- 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 2ec888f..0bc1d89 100644 (file)
--- 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);