sb/intel/i82371eb/fadt: Fix compilation on x86_64

Change-Id: I8997910ff003a4d0c97656cb1e9a4342230ac51a
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/31471
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/southbridge/intel/i82371eb/fadt.c b/src/southbridge/intel/i82371eb/fadt.c
index 41ad31c..2a3a18a 100644
--- a/src/southbridge/intel/i82371eb/fadt.c
+++ b/src/southbridge/intel/i82371eb/fadt.c
@@ -46,8 +46,8 @@
 	memcpy(header->asl_compiler_id, ASLC, 4);
 	header->asl_compiler_revision = 42;
 
-	fadt->firmware_ctrl = (u32)facs;
-	fadt->dsdt = (u32)dsdt;
+	fadt->firmware_ctrl = (uintptr_t)facs;
+	fadt->dsdt = (uintptr_t)dsdt;
 	fadt->preferred_pm_profile = 0; /* unspecified */
 	fadt->sci_int = 9;
 	fadt->smi_cmd = 0; /* smi command port */
@@ -153,9 +153,9 @@
 	fadt->reset_reg.addrh = 0x0;
 	fadt->reset_value = 0;
 
-	fadt->x_firmware_ctl_l = (u32)facs;
+	fadt->x_firmware_ctl_l = (uintptr_t)facs;
 	fadt->x_firmware_ctl_h = 0;
-	fadt->x_dsdt_l = (u32)dsdt;
+	fadt->x_dsdt_l = (uintptr_t)dsdt;
 	fadt->x_dsdt_h = 0;
 
 	fadt->x_pm1a_evt_blk.space_id = 1;