SB800 RAID: add kconfig option RAID_MISC_ROM_POSITION

SB800 RAID ROM require to put the misc ROM to specific position,
this patch enable user to put the RAID misc ROM to the right place
in the coreboot image.

Change-Id: I4fc64df8e091fb0cccd063826ab31a4f198942d1
Signed-off-by: Kerry She <kerry.she@amd.com>
Signed-off-by: Kerry She <shekairui@gmail.com>
Reviewed-on: http://review.coreboot.org/249
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>
diff --git a/src/southbridge/amd/cimx/sb800/Kconfig b/src/southbridge/amd/cimx/sb800/Kconfig
index 17ff3f9..79624e0 100644
--- a/src/southbridge/amd/cimx/sb800/Kconfig
+++ b/src/southbridge/amd/cimx/sb800/Kconfig
@@ -111,6 +111,15 @@
         default "site-local/sb800/misc.bin"
 	depends on SB800_SATA_RAID
 
+config RAID_MISC_ROM_POSITION
+	hex "RAID Misc ROM Position"
+	default 0xFFF00000
+	depends on SB800_SATA_RAID
+	help
+	  The RAID ROM requires that the MISC ROM is located between the range
+	  0xFFF0_0000 to 0xFFF0_FFFF. Also, it must 1K bytes aligned.
+	  The CONFIG_ROM_SIZE must larger than 0x100000.
+
 endif
 
 endif #SOUTHBRIDGE_AMD_CIMX_SB800