diff --git a/README b/README
index a0f54645fc26..11273726d323 100644
--- a/README
+++ b/README
@@ -559,19 +559,6 @@ The following options need to be configured:
 		such as ARM architectural timer initialization.
 
 - Linux Kernel Interface:
-		CONFIG_CLOCKS_IN_MHZ
-
-		U-Boot stores all clock information in Hz
-		internally. For binary compatibility with older Linux
-		kernels (which expect the clocks passed in the
-		bd_info data to be in MHz) the environment variable
-		"clocks_in_mhz" can be defined so that U-Boot
-		converts clock data to MHZ before passing it to the
-		Linux kernel.
-		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
-		"clocks_in_mhz=1" is automatically included in the
-		default environment.
-
 		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
 
 		When transferring memsize parameter to Linux, some versions
diff --git a/include/configs/MPC8536DS.h b/include/configs/MPC8536DS.h
index 340574a98526..3956bdd2512c 100644
--- a/include/configs/MPC8536DS.h
+++ b/include/configs/MPC8536DS.h
@@ -124,8 +124,6 @@
 #error ("CONFIG_SPD_EEPROM is required")
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Memory map -- xxx -this is wrong, needs updating
  *
diff --git a/include/configs/MPC8540ADS.h b/include/configs/MPC8540ADS.h
index f78782a1c140..f15af931483c 100644
--- a/include/configs/MPC8540ADS.h
+++ b/include/configs/MPC8540ADS.h
@@ -112,8 +112,6 @@
 
 #define CONFIG_SYS_FLASH_EMPTY_INFO
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Local Bus Definitions
  */
diff --git a/include/configs/MPC8541CDS.h b/include/configs/MPC8541CDS.h
index b2a320107203..9c77dcecd99a 100644
--- a/include/configs/MPC8541CDS.h
+++ b/include/configs/MPC8541CDS.h
@@ -57,8 +57,6 @@ extern unsigned long get_clock_freq(void);
 #error ("CONFIG_SPD_EEPROM is required by MPC85555CDS")
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Local Bus Definitions
  */
diff --git a/include/configs/MPC8544DS.h b/include/configs/MPC8544DS.h
index c9f193fc4672..49c2a4acca27 100644
--- a/include/configs/MPC8544DS.h
+++ b/include/configs/MPC8544DS.h
@@ -63,8 +63,6 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
 #error ("CONFIG_SPD_EEPROM is required")
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Memory map
  *
diff --git a/include/configs/MPC8548CDS.h b/include/configs/MPC8548CDS.h
index de2bfd8f2f4a..933417483483 100644
--- a/include/configs/MPC8548CDS.h
+++ b/include/configs/MPC8548CDS.h
@@ -73,7 +73,6 @@ extern unsigned long get_clock_freq(void);
 #error ("CONFIG_SPD_EEPROM is required")
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
 /*
  * Physical Address Map
  *
diff --git a/include/configs/MPC8555CDS.h b/include/configs/MPC8555CDS.h
index d964b4e12173..9a14323b52ef 100644
--- a/include/configs/MPC8555CDS.h
+++ b/include/configs/MPC8555CDS.h
@@ -55,8 +55,6 @@ extern unsigned long get_clock_freq(void);
 #error ("CONFIG_SPD_EEPROM is required by MPC85555CDS")
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Local Bus Definitions
  */
diff --git a/include/configs/MPC8560ADS.h b/include/configs/MPC8560ADS.h
index 97d8cc48edf7..250f2de86060 100644
--- a/include/configs/MPC8560ADS.h
+++ b/include/configs/MPC8560ADS.h
@@ -113,8 +113,6 @@
 
 #define CONFIG_SYS_FLASH_EMPTY_INFO
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Local Bus Definitions
  */
diff --git a/include/configs/MPC8568MDS.h b/include/configs/MPC8568MDS.h
index a0bd5f4d40f6..46d6b16d34d2 100644
--- a/include/configs/MPC8568MDS.h
+++ b/include/configs/MPC8568MDS.h
@@ -59,8 +59,6 @@ extern unsigned long get_clock_freq(void);
 #error ("CONFIG_SPD_EEPROM is required")
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Local Bus Definitions
  */
diff --git a/include/configs/MPC8569MDS.h b/include/configs/MPC8569MDS.h
index beba848214e7..bbc75e35a7f8 100644
--- a/include/configs/MPC8569MDS.h
+++ b/include/configs/MPC8569MDS.h
@@ -109,8 +109,6 @@ extern unsigned long get_clock_freq(void);
 #define CONFIG_SYS_DDR_ERR_DIS          0x00000000
 #define CONFIG_SYS_DDR_SBE              0x00010000
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Local Bus Definitions
  */
diff --git a/include/configs/MPC8572DS.h b/include/configs/MPC8572DS.h
index 3243f39df4b5..d924b2ba6117 100644
--- a/include/configs/MPC8572DS.h
+++ b/include/configs/MPC8572DS.h
@@ -118,8 +118,6 @@
 #error ("CONFIG_SPD_EEPROM is required")
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Memory map
  *
diff --git a/include/configs/MPC8610HPCD.h b/include/configs/MPC8610HPCD.h
index b2acc7297361..c0407bbc16b2 100644
--- a/include/configs/MPC8610HPCD.h
+++ b/include/configs/MPC8610HPCD.h
@@ -176,8 +176,6 @@
 #define CONFIG_SYS_SDRAM_SIZE	256
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 #define CONFIG_SYS_INIT_RAM_LOCK	1
 #ifndef CONFIG_SYS_INIT_RAM_LOCK
 #define CONFIG_SYS_INIT_RAM_ADDR	0xe4010000	/* Initial RAM address */
diff --git a/include/configs/MPC8641HPCN.h b/include/configs/MPC8641HPCN.h
index edbeeefdd4a9..ad8d261b3b4b 100644
--- a/include/configs/MPC8641HPCN.h
+++ b/include/configs/MPC8641HPCN.h
@@ -221,8 +221,6 @@ extern unsigned long get_board_sys_clk(unsigned long dummy);
 #define CONFIG_SYS_SDRAM_SIZE	256
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 #define CONFIG_SYS_INIT_RAM_LOCK	1
 #ifndef CONFIG_SYS_INIT_RAM_LOCK
 #define CONFIG_SYS_INIT_RAM_ADDR	0x0fd00000	/* Initial RAM address */
diff --git a/include/configs/UCP1020.h b/include/configs/UCP1020.h
index cfc9567332e9..2590a28867d3 100644
--- a/include/configs/UCP1020.h
+++ b/include/configs/UCP1020.h
@@ -227,8 +227,6 @@
 #define CONFIG_SYS_DDR_MODE_2		0x8000c000
 #define CONFIG_SYS_DDR_INTERVAL		0x0C300000
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Memory map
  *
diff --git a/include/configs/p1_p2_rdb_pc.h b/include/configs/p1_p2_rdb_pc.h
index 219e5d216bbc..6b57be912ac5 100644
--- a/include/configs/p1_p2_rdb_pc.h
+++ b/include/configs/p1_p2_rdb_pc.h
@@ -300,8 +300,6 @@
 #define CONFIG_SYS_DDR_INTERVAL		0x0C300000
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * Memory map
  *
diff --git a/include/configs/sbc8548.h b/include/configs/sbc8548.h
index 55c4bff28ae4..4cdfd1b099e7 100644
--- a/include/configs/sbc8548.h
+++ b/include/configs/sbc8548.h
@@ -118,8 +118,6 @@
 	#define CONFIG_SYS_DDR_CONTROL	0xc300c000
 #endif
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 /*
  * FLASH on the Local Bus
  * Two banks, one 8MB the other 64MB, using the CFI driver.
diff --git a/include/configs/sbc8641d.h b/include/configs/sbc8641d.h
index 4ab364ae9a2f..662160701440 100644
--- a/include/configs/sbc8641d.h
+++ b/include/configs/sbc8641d.h
@@ -206,8 +206,6 @@
 #define CONFIG_SYS_WRITE_SWAPPED_DATA
 #define CONFIG_SYS_FLASH_EMPTY_INFO
 
-#undef CONFIG_CLOCKS_IN_MHZ
-
 #define CONFIG_SYS_INIT_RAM_LOCK	1
 #ifndef CONFIG_SYS_INIT_RAM_LOCK
 #define CONFIG_SYS_INIT_RAM_ADDR	0x0fd00000	/* Initial RAM address */
diff --git a/include/env_default.h b/include/env_default.h
index a657927e06f5..8a0c3057f0aa 100644
--- a/include/env_default.h
+++ b/include/env_default.h
@@ -83,9 +83,6 @@ const uchar default_environment[] = {
 #ifdef	CONFIG_LOADADDR
 	"loadaddr="	__stringify(CONFIG_LOADADDR)	"\0"
 #endif
-#ifdef	CONFIG_CLOCKS_IN_MHZ
-	"clocks_in_mhz=1\0"
-#endif
 #if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0)
 	"pcidelay="	__stringify(CONFIG_PCI_BOOTDELAY)"\0"
 #endif
