Blackfin: bf548-ezkit: bump SPI flash size up

The current size used (256KiB) is smaller than the LDR created for
the bf548-ezkit, so 'run update' doesn't work correctly.  So bump
up the size a bit by making this flexible per-board config.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

include/configs/bf548-ezkit.h

@@ -182,6 +182,7 @@
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_RTC_BFIN
 #define CONFIG_UART_CONSOLE	1
+#define CONFIG_BFIN_SPI_IMG_SIZE 0x50000
 
 #ifndef __ADSPBF542__
 /* Don't waste time transferring a logo over the UART */

include/configs/bfin_adi_common.h

@@ -172,9 +172,12 @@
 #   define UBOOT_ENV_UPDATE \
 		"eeprom write $(loadaddr) 0x0 $(filesize)"
 #  else
+#   ifndef CONFIG_BFIN_SPI_IMG_SIZE
+#    define CONFIG_BFIN_SPI_IMG_SIZE 0x40000
+#   endif
 #   define UBOOT_ENV_UPDATE \
 		"sf probe " MK_STR(BFIN_BOOT_SPI_SSEL) ";" \
-		"sf erase 0 0x40000;" \
+		"sf erase 0 " MK_STR(CONFIG_BFIN_SPI_IMG_SIZE) ";" \
 		"sf write $(loadaddr) 0 $(filesize)"
 #  endif
 # elif (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_NAND)