diff --git a/src/drivers/intel/fsp1_0/cache_as_ram.inc b/src/drivers/intel/fsp1_0/cache_as_ram.inc
index cdbda54a8b..91cfb88791 100644
--- a/src/drivers/intel/fsp1_0/cache_as_ram.inc
+++ b/src/drivers/intel/fsp1_0/cache_as_ram.inc
@@ -29,24 +29,14 @@
 # error "CONFIG_FSP_LOC must be set."
 #endif
 
-#ifndef CONFIG_POST_IO
-# error "CONFIG_POST_IO must be set."
-#endif
-
-#if CONFIG_POST_IO
-# ifndef CONFIG_POST_IO_PORT
-#  error "CONFIG_POST_IO_PORT must be set."
-# endif
-#endif
-
 #ifndef CONFIG_CPU_MICROCODE_CBFS_LOC
 # error "CONFIG_CPU_MICROCODE_CBFS_LOC must be set."
 #endif
 
-#define LHLT_DELAY	0x50000		/* I/O delay between post codes on failure */
-
 	cmp   $0, %eax
-	jne   bisthalt
+	je    cache_as_ram
+	mov   $0xa0, %eax
+	jmp   .Lhlt
 
 cache_as_ram:
 	post_code(0x20)
@@ -61,8 +51,11 @@ find_fsp_ret:
 	/* Save the FSP location */
 	mov   %eax,   %ebp
 	cmp   $CONFIG_FSP_LOC, %eax
-	jb    halt1
+	je    find_fsp_ok
+	add   $0xb0, %eax
+	jmp   .Lhlt
 
+find_fsp_ok:
 	post_code(0x22)
 
 	/* Calculate entry into FSP */
@@ -81,7 +74,11 @@ find_fsp_ret:
 CAR_init_done:
 	addl  $4, %esp
 	cmp   $0, %eax
-	jne   halt2
+	je    car_init_ok
+	add   $0xc0, %eax
+	jmp   .Lhlt
+
+car_init_ok:
 
 	/* Save FSP_INFO_HEADER location in ebx */
 	mov    %ebp, %ebx
@@ -111,50 +108,11 @@ before_romstage:
 	movb  $0xB8, %ah
 	jmp   .Lhlt
 
-bisthalt:
-	movb  $0xB9, %ah
-	jmp   .Lhlt
-
-halt1:
-	/*
-	 * Failures for postcode 0xBA - failed in find_fsp()
-	 *
-	 * Values are:
-	 * 0x01 - FV signature, "_FVH" not present
-	 * 0x02 - FFS GUID not present
-	 * 0x03 - FSP INFO Header not found
-	 * 0x04 - ImageBase does not equal CONFIG_FSP_LOC - Is the FSP rebased to
-	 *        a different location, or does it need to be?
-	 * 0x05 - FSP INFO Header signature "FSPH" not found
-	 * 0x06 - FSP Image ID is not the expected ID.
-	 */
-	movb  $0xBA, %ah
-	jmp   .Lhlt
-
-halt2:
-	/*
-	 * Failures for postcode 0xBB - failed in the FSP:
-	 *
-	 * 0x00 - FSP_SUCCESS: Temp RAM was initialized successfully.
-	 * 0x02 - FSP_INVALID_PARAMETER: Input parameters are invalid.
-	 * 0x0E - FSP_NOT_FOUND: No valid microcode was found in the microcode region.
-	 * 0x03 - FSP_UNSUPPORTED: The FSP calling conditions were not met.
-	 * 0x07 - FSP_DEVICE_ERROR: Temp RAM initialization failed
-	 * 0x14 - FSP_ALREADY_STARTED: Temp RAM initialization has been invoked
-	 */
-	movb  $0xBB, %ah
-
 .Lhlt:
-	xchg  %al, %ah
-#if CONFIG_POST_IO
+#if IS_ENABLED(CONFIG_POST_IO)
 	outb  %al, $CONFIG_POST_IO_PORT
-#else
-	post_code(POST_DEAD_CODE)
 #endif
-	movl  $LHLT_DELAY, %ecx
-.Lhlt_Delay:
-	outb  %al, $0xED
-	loop  .Lhlt_Delay
+	hlt
 	jmp   .Lhlt
 
 /*
diff --git a/src/mainboard/intel/bakersport_fsp/Kconfig b/src/mainboard/intel/bakersport_fsp/Kconfig
index 3575ab30e0..0e18423f4b 100644
--- a/src/mainboard/intel/bakersport_fsp/Kconfig
+++ b/src/mainboard/intel/bakersport_fsp/Kconfig
@@ -25,7 +25,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select BOARD_ROMSIZE_KB_2048
 	select HAVE_ACPI_TABLES
 	select HAVE_OPTION_TABLE
-	select POST_IO
 	select ENABLE_BUILTIN_COM1 if FSP_PACKAGE_DEFAULT
 	select HAVE_FSP_BIN if FSP_PACKAGE_DEFAULT
 	select TSC_MONOTONIC_TIMER
diff --git a/src/mainboard/intel/bayleybay_fsp/Kconfig b/src/mainboard/intel/bayleybay_fsp/Kconfig
index 9897cfccc4..8bf79b2ca4 100644
--- a/src/mainboard/intel/bayleybay_fsp/Kconfig
+++ b/src/mainboard/intel/bayleybay_fsp/Kconfig
@@ -25,7 +25,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select BOARD_ROMSIZE_KB_2048
 	select HAVE_ACPI_TABLES
 	select HAVE_OPTION_TABLE
-	select POST_IO
 	select ENABLE_BUILTIN_COM1 if FSP_PACKAGE_DEFAULT
 	select HAVE_FSP_BIN if FSP_PACKAGE_DEFAULT
 	select TSC_MONOTONIC_TIMER
diff --git a/src/mainboard/intel/minnowmax/Kconfig b/src/mainboard/intel/minnowmax/Kconfig
index 39f84f125f..e09efc9582 100644
--- a/src/mainboard/intel/minnowmax/Kconfig
+++ b/src/mainboard/intel/minnowmax/Kconfig
@@ -63,10 +63,6 @@ config VIRTUAL_ROM_SIZE
 	depends on ENABLE_FSP_FAST_BOOT
 	default 0x800000
 
-config POST_IO
-	bool
-	default n
-
 config POST_DEVICE
 	bool
 	default n