pcm052: allow specifying onboard DDR size in configs

PCM052 SoMs may be equipped with various sizes of DDR.
Keep default of 256MB; new PCM052-based targets will
specify their actual DDR size.

Linux command line is auto-adjusted to DDR size.

Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>

board/phytec/pcm052/Kconfig

@@ -12,4 +12,8 @@ config SYS_SOC
 config SYS_CONFIG_NAME
 	default "pcm052"
 
+config PCM052_DDR_SIZE
+	int
+	default 256
+
 endif

include/configs/pcm052.h

@@ -134,7 +134,8 @@
 	"tftptimeout=1000\0" \
 	"tftptimeoutcountmax=1000000\0" \
 	"mtdparts=" MTDPARTS_DEFAULT "\0" \
-	"bootargs_base=setenv bootargs rw mem=256M " \
+	"bootargs_base=setenv bootargs rw " \
+		" mem=" __stringify(CONFIG_PCM052_DDR_SIZE) "M " \
 		"console=ttyLP1,115200n8\0" \
 	"bootargs_sd=setenv bootargs ${bootargs} " \
 		"root=/dev/mmcblk0p2 rootwait\0" \
@@ -218,7 +219,7 @@
 /* Physical memory map */
 #define CONFIG_NR_DRAM_BANKS		1
 #define PHYS_SDRAM			(0x80000000)
-#define PHYS_SDRAM_SIZE			(256 * 1024 * 1024)
+#define PHYS_SDRAM_SIZE			(CONFIG_PCM052_DDR_SIZE * 1024 * 1024)
 
 #define CONFIG_SYS_SDRAM_BASE		PHYS_SDRAM
 #define CONFIG_SYS_INIT_RAM_ADDR	IRAM_BASE_ADDR