diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 524b80722fd0134e24a61e2b67edc62166cce255..787515c6770e559195adafdd6de7732d0d66175e 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -541,17 +541,6 @@ config DEFAULT_MEM_START
 
 	  If unsure, leave the default value here.
 
-config DEFAULT_MEM_SIZE
-	hex "Maximal size of the default memory area"
-	depends on PLATFORM_WANT_DEFAULT_MEM
-	default 0x04000000
-	help
-	  This is the size of the default memory area.
-	  Default memory area has platform-specific meaning, it may be used
-	  for e.g. early cache initialization.
-
-	  If unsure, leave the default value here.
-
 config XTFPGA_LCD
 	bool "Enable XTFPGA LCD driver"
 	depends on XTENSA_PLATFORM_XTFPGA
diff --git a/arch/xtensa/configs/nommu_kc705_defconfig b/arch/xtensa/configs/nommu_kc705_defconfig
index 610f622d3c84910401a3378b702a2aea007b40dc..f3fc4f970ca8e22b0f7c271bced6235640e787af 100644
--- a/arch/xtensa/configs/nommu_kc705_defconfig
+++ b/arch/xtensa/configs/nommu_kc705_defconfig
@@ -40,7 +40,6 @@ CONFIG_CMDLINE_BOOL=y
 CONFIG_CMDLINE="earlycon=uart8250,mmio32native,0x9d050020,115200n8 console=ttyS0,115200n8 ip=dhcp root=/dev/nfs rw debug memmap=256M@0x60000000"
 CONFIG_USE_OF=y
 CONFIG_BUILTIN_DTB="kc705_nommu"
-CONFIG_DEFAULT_MEM_SIZE=0x10000000
 CONFIG_BINFMT_FLAT=y
 CONFIG_NET=y
 CONFIG_PACKET=y
diff --git a/arch/xtensa/platforms/iss/include/platform/hardware.h b/arch/xtensa/platforms/iss/include/platform/hardware.h
index 6930c12adc1678344dd90541538eb90cb883ca97..9acea2508c05884b1a2042a36da0abf02f8ab464 100644
--- a/arch/xtensa/platforms/iss/include/platform/hardware.h
+++ b/arch/xtensa/platforms/iss/include/platform/hardware.h
@@ -20,7 +20,6 @@
  */
 
 #define PLATFORM_DEFAULT_MEM_START	0x00000000
-#define PLATFORM_DEFAULT_MEM_SIZE	0x08000000
 
 /*
  * Interrupt configuration.
diff --git a/arch/xtensa/platforms/xt2000/include/platform/hardware.h b/arch/xtensa/platforms/xt2000/include/platform/hardware.h
index 886ef156ded3693ea49d00cf073d5121d17d18cd..4ad16bfc63b83f3cbf5a93c8e765ee2030fe4ad0 100644
--- a/arch/xtensa/platforms/xt2000/include/platform/hardware.h
+++ b/arch/xtensa/platforms/xt2000/include/platform/hardware.h
@@ -22,7 +22,6 @@
  */
 
 #define PLATFORM_DEFAULT_MEM_START 0x00000000
-#define PLATFORM_DEFAULT_MEM_SIZE 0x08000000
 
 /*
  * Number of platform IRQs
diff --git a/arch/xtensa/platforms/xtfpga/include/platform/hardware.h b/arch/xtensa/platforms/xtfpga/include/platform/hardware.h
index 1fda7e20dfcbff79849e5aae29ac8a6529c43e39..cbf3cddafeafbbb21048af533493e79ec8a5972d 100644
--- a/arch/xtensa/platforms/xtfpga/include/platform/hardware.h
+++ b/arch/xtensa/platforms/xtfpga/include/platform/hardware.h
@@ -20,7 +20,6 @@
 /* Memory configuration. */
 
 #define PLATFORM_DEFAULT_MEM_START __XTENSA_UL(CONFIG_DEFAULT_MEM_START)
-#define PLATFORM_DEFAULT_MEM_SIZE  __XTENSA_UL(CONFIG_DEFAULT_MEM_SIZE)
 
 /* Interrupt configuration. */