xtensa: make PLATFORM_DEFAULT_MEM parameters configurable

This allows using xtfpga platform with both MMU and noMMU cores.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

2 files changed, 38 insertions, 2 deletions

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index cb44f6f95968..f860dbe28b5e 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -319,6 +319,7 @@ config XTENSA_PLATFORM_S6105
 config XTENSA_PLATFORM_XTFPGA
         bool "XTFPGA"
         select ETHOC if ETHERNET
+        select PLATFORM_WANT_DEFAULT_MEM
         select SERIAL_CONSOLE
         select XTENSA_CALIBRATE_CCOUNT
         help
@@ -405,6 +406,41 @@ source "drivers/pcmcia/Kconfig"
 
 source "drivers/pci/hotplug/Kconfig"
 
+config PLATFORM_WANT_DEFAULT_MEM
+        def_bool n
+
+config DEFAULT_MEM_START
+        hex "Physical address of the default memory area start"
+        depends on PLATFORM_WANT_DEFAULT_MEM
+        default 0x00000000 if MMU
+        default 0x40000000 if !MMU
+        help
+          This is a fallback start address of the default memory area, it is
+          used when no physical memory size is passed through DTB or through
+          boot parameter from bootloader.
+
+          In noMMU configuration the following parameters are derived from it:
+          - kernel load address;
+          - kernel entry point address;
+          - relocatable vectors base address;
+          - uBoot load address;
+          - TASK_SIZE.
+
+          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 a fallback size of the default memory area, it is used when
+          no physical memory size is passed through DTB or through boot
+          parameter from bootloader.
+
+          It's also used for TASK_SIZE calculation in noMMU configuration.
+
+          If unsure, leave the default value here.
+
 endmenu
 
 menu "Executable file formats"
diff --git a/arch/xtensa/platforms/xtfpga/include/platform/hardware.h b/arch/xtensa/platforms/xtfpga/include/platform/hardware.h
index aeb316b7ff88..6edd20bb4565 100644
--- a/arch/xtensa/platforms/xtfpga/include/platform/hardware.h
+++ b/arch/xtensa/platforms/xtfpga/include/platform/hardware.h
@@ -17,8 +17,8 @@
 
 /* Memory configuration. */
 
-#define PLATFORM_DEFAULT_MEM_START 0x00000000
-#define PLATFORM_DEFAULT_MEM_SIZE  0x04000000
+#define PLATFORM_DEFAULT_MEM_START CONFIG_DEFAULT_MEM_START
+#define PLATFORM_DEFAULT_MEM_SIZE  CONFIG_DEFAULT_MEM_SIZE
 
 /* Interrupt configuration. */