diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index c320a35..ba62394 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -318,7 +318,7 @@
 	gd->ram_size -= CONFIG_SYS_MEM_TOP_HIDE;
 #endif
 
-	addr = CONFIG_SYS_SDRAM_BASE + gd->ram_size;
+	addr = CONFIG_SYS_SDRAM_BASE + get_effective_memsize();
 
 #ifdef CONFIG_LOGBUFFER
 #ifndef CONFIG_ALT_LB_ADDR
diff --git a/arch/powerpc/cpu/mpc512x/traps.c b/arch/powerpc/cpu/mpc512x/traps.c
index 1016991..9f5bcd7 100644
--- a/arch/powerpc/cpu/mpc512x/traps.c
+++ b/arch/powerpc/cpu/mpc512x/traps.c
@@ -27,7 +27,6 @@
  * amount of memory on the system if we're unable to keep all
  * the memory mapped in.
  */
-extern ulong get_effective_memsize(void);
 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
 
 /*
diff --git a/arch/powerpc/cpu/mpc85xx/traps.c b/arch/powerpc/cpu/mpc85xx/traps.c
index 3ef6e4a..24adbc3 100644
--- a/arch/powerpc/cpu/mpc85xx/traps.c
+++ b/arch/powerpc/cpu/mpc85xx/traps.c
@@ -35,7 +35,6 @@
  * amount of memory on the system if we're unable to keep all
  * the memory mapped in.
  */
-extern ulong get_effective_memsize(void);
 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
 
 static __inline__ void set_tsr(unsigned long val)
diff --git a/arch/powerpc/cpu/mpc86xx/traps.c b/arch/powerpc/cpu/mpc86xx/traps.c
index 0b7ea3b..92fb537 100644
--- a/arch/powerpc/cpu/mpc86xx/traps.c
+++ b/arch/powerpc/cpu/mpc86xx/traps.c
@@ -29,7 +29,6 @@
  * amount of memory on the system if we're unable to keep all
  * the memory mapped in.
  */
-extern ulong get_effective_memsize(void);
 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
 
 /*
diff --git a/arch/powerpc/lib/board.c b/arch/powerpc/lib/board.c
index 34bbfca..13d761c 100644
--- a/arch/powerpc/lib/board.c
+++ b/arch/powerpc/lib/board.c
@@ -312,17 +312,6 @@
 	NULL,	/* Terminate this list */
 };
 
-ulong get_effective_memsize(void)
-{
-#ifndef	CONFIG_VERY_BIG_RAM
-	return gd->ram_size;
-#else
-	/* limit stack to what we can reasonable map */
-	return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
-		CONFIG_MAX_MEM_MAPPED : gd->ram_size);
-#endif
-}
-
 static int __fixup_cpu(void)
 {
 	return 0;
@@ -343,13 +332,6 @@
  * initialized, and stack space is limited to a few kB.
  */
 
-#ifdef CONFIG_LOGBUFFER
-unsigned long logbuffer_base(void)
-{
-	return CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - LOGBUFF_LEN;
-}
-#endif
-
 void board_init_f(ulong bootflag)
 {
 	bd_t *bd;
diff --git a/arch/powerpc/lib/bootm.c b/arch/powerpc/lib/bootm.c
index 41fc8f7..c08b62c 100644
--- a/arch/powerpc/lib/bootm.c
+++ b/arch/powerpc/lib/bootm.c
@@ -30,7 +30,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-extern ulong get_effective_memsize(void);
 static ulong get_sp (void);
 extern void ft_fixup_num_cores(void *blob);
 static void set_clocks_in_mhz (bd_t *kbd);
diff --git a/board/freescale/c29xpcie/spl.c b/board/freescale/c29xpcie/spl.c
index 3cfdb72..2111711 100644
--- a/board/freescale/c29xpcie/spl.c
+++ b/board/freescale/c29xpcie/spl.c
@@ -12,7 +12,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-ulong get_effective_memsize(void)
+phys_size_t get_effective_memsize(void)
 {
 	return CONFIG_SYS_L2_SIZE;
 }
diff --git a/board/freescale/p1022ds/spl.c b/board/freescale/p1022ds/spl.c
index 7f151e3..7bd9d29 100644
--- a/board/freescale/p1022ds/spl.c
+++ b/board/freescale/p1022ds/spl.c
@@ -21,7 +21,7 @@
 	99999000, 11111000, 12499800, 13333200
 };
 
-ulong get_effective_memsize(void)
+phys_size_t get_effective_memsize(void)
 {
 	return CONFIG_SYS_L2_SIZE;
 }
diff --git a/board/freescale/p1_p2_rdb_pc/spl.c b/board/freescale/p1_p2_rdb_pc/spl.c
index 9bb0716..8d0d850 100644
--- a/board/freescale/p1_p2_rdb_pc/spl.c
+++ b/board/freescale/p1_p2_rdb_pc/spl.c
@@ -20,7 +20,7 @@
 	99999000, 11111000, 12499800, 13333200
 };
 
-ulong get_effective_memsize(void)
+phys_size_t get_effective_memsize(void)
 {
 	return CONFIG_SYS_L2_SIZE;
 }
diff --git a/common/board_f.c b/common/board_f.c
index 02965b0..a973b95 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -223,17 +223,6 @@
 	return 0;
 }
 
-ulong get_effective_memsize(void)
-{
-#ifndef	CONFIG_VERY_BIG_RAM
-	return gd->ram_size;
-#else
-	/* limit stack to what we can reasonable map */
-	return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
-		CONFIG_MAX_MEM_MAPPED : gd->ram_size);
-#endif
-}
-
 void __dram_init_banksize(void)
 {
 #if defined(CONFIG_NR_DRAM_BANKS) && defined(CONFIG_SYS_SDRAM_BASE)
diff --git a/common/cmd_log.c b/common/cmd_log.c
index 8164bdf..38d0f5e 100644
--- a/common/cmd_log.c
+++ b/common/cmd_log.c
@@ -52,7 +52,7 @@
 
 unsigned long __logbuffer_base(void)
 {
-	return CONFIG_SYS_SDRAM_BASE + gd->ram_size - LOGBUFF_LEN;
+	return CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - LOGBUFF_LEN;
 }
 unsigned long logbuffer_base(void)
 __attribute__((weak, alias("__logbuffer_base")));
diff --git a/common/memsize.c b/common/memsize.c
index 73b92c8..589400d 100644
--- a/common/memsize.c
+++ b/common/memsize.c
@@ -5,7 +5,10 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-#include <config.h>
+#include <common.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
 #ifdef __PPC__
 /*
  * At least on G2 PowerPC cores, sequential accesses to non-existent
@@ -76,3 +79,14 @@
 
 	return (maxsize);
 }
+
+phys_size_t __weak get_effective_memsize(void)
+{
+#ifndef CONFIG_VERY_BIG_RAM
+	return gd->ram_size;
+#else
+	/* limit stack to what we can reasonable map */
+	return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
+		CONFIG_MAX_MEM_MAPPED : gd->ram_size);
+#endif
+}
diff --git a/include/common.h b/include/common.h
index 033b5d9..96a45a6 100644
--- a/include/common.h
+++ b/include/common.h
@@ -461,6 +461,7 @@
 
 /* common/memsize.c */
 long	get_ram_size  (long *, long);
+phys_size_t get_effective_memsize(void);
 
 /* $(BOARD)/$(BOARD).c */
 void	reset_phy     (void);