mpc83xx: sbc8349 - make enabling PCI more user friendly

[oweals/u-boot.git] / include / configs / sbc8349.h

diff --git a/include/configs/sbc8349.h b/include/configs/sbc8349.h
index 868bd54a6a3defaeea627d726178353d755d7b0e..088b28356c09ab81c91dd2fb0458586675ee075d 100644 (file)
--- a/include/configs/sbc8349.h
+++ b/include/configs/sbc8349.h
@@ -40,24 +40,28 @@
 #define CONFIG_MPC8349         1       /* MPC8349 specific */
 #define CONFIG_SBC8349         1       /* WRS SBC8349 board specific */
 
-#undef CONFIG_PCI
 /* Don't enable PCI2 on sbc834x - it doesn't exist physically. */
 #undef CONFIG_MPC83XX_PCI2             /* support for 2nd PCI controller */
 
-#define PCI_66M
-#ifdef PCI_66M
-#define CONFIG_83XX_CLKIN      66000000        /* in Hz */
-#else
+/*
+ * The default if PCI isn't enabled, or if no PCI clk setting is given
+ * is 66MHz; this is what the board defaults to when the PCI slot is
+ * physically empty.  The board will automatically (i.e w/o jumpers)
+ * clock down to 33MHz if you insert a 33MHz PCI card.
+ */
+#ifdef PCI_33M
 #define CONFIG_83XX_CLKIN      33000000        /* in Hz */
+#else  /* 66M */
+#define CONFIG_83XX_CLKIN      66000000        /* in Hz */
 #endif
 
 #ifndef CONFIG_SYS_CLK_FREQ
-#ifdef PCI_66M
-#define CONFIG_SYS_CLK_FREQ    66000000
-#define HRCWL_CSB_TO_CLKIN     HRCWL_CSB_TO_CLKIN_4X1
-#else
+#ifdef PCI_33M
 #define CONFIG_SYS_CLK_FREQ    33000000
 #define HRCWL_CSB_TO_CLKIN     HRCWL_CSB_TO_CLKIN_8X1
+#else  /* 66M */
+#define CONFIG_SYS_CLK_FREQ    66000000
+#define HRCWL_CSB_TO_CLKIN     HRCWL_CSB_TO_CLKIN_4X1
 #endif
 #endif