diff --git a/src/mainboard/google/guybrush/mainboard.c b/src/mainboard/google/guybrush/mainboard.c
index 8deb2ac..a7eab08 100644
--- a/src/mainboard/google/guybrush/mainboard.c
+++ b/src/mainboard/google/guybrush/mainboard.c
@@ -12,7 +12,6 @@
 #include <gpio.h>
 #include <soc/acpi.h>
 #include <variant/ec.h>
-#include <string.h>
 
 #define BACKLIGHT_GPIO			GPIO_129
 #define WWAN_AUX_RST_GPIO		GPIO_18
@@ -23,16 +22,8 @@
 #define METHOD_MAINBOARD_PTS		"\\_SB.MPTS"
 #define METHOD_MAINBOARD_S0X		"\\_SB.MS0X"
 
-/*
- * These arrays set up the FCH PCI_INTR registers 0xC00/0xC01.
- * This table is responsible for physically routing the PIC and
- * IOAPIC IRQs to the different PCI devices on the system.  It
- * is read and written via registers 0xC00/0xC01 as an
- * Index/Data pair.  These values are chipset and mainboard
- * dependent and should be updated accordingly.
- */
-static uint8_t fch_pic_routing[FCH_IRQ_ROUTING_ENTRIES];
-static uint8_t fch_apic_routing[FCH_IRQ_ROUTING_ENTRIES];
+/* The IRQ mapping in fch_irq_map ends up getting written to the indirect address space that is
+   accessed via I/O ports 0xc00/0xc01. */
 
 /*
  * This controls the device -> IRQ routing.
@@ -74,41 +65,12 @@
 	{ PIRQ_HPET_H,	0x00,		0x00 },
 };
 
-static const struct fch_irq_routing *mb_get_fch_irq_mapping(size_t *length)
+const struct fch_irq_routing *mb_get_fch_irq_mapping(size_t *length)
 {
 	*length = ARRAY_SIZE(fch_irq_map);
 	return fch_irq_map;
 }
 
-static void init_tables(void)
-{
-	const struct fch_irq_routing *mb_irq_map;
-	size_t mb_fch_irq_mapping_table_size;
-	size_t i;
-
-	mb_irq_map = mb_get_fch_irq_mapping(&mb_fch_irq_mapping_table_size);
-
-	memset(fch_pic_routing, PIRQ_NC, sizeof(fch_pic_routing));
-	memset(fch_apic_routing, PIRQ_NC, sizeof(fch_apic_routing));
-
-	for (i = 0; i < mb_fch_irq_mapping_table_size; i++) {
-		if (mb_irq_map[i].intr_index >= FCH_IRQ_ROUTING_ENTRIES) {
-			printk(BIOS_WARNING,
-			       "Invalid IRQ index %u in FCH IRQ routing table entry %zu\n",
-			       mb_irq_map[i].intr_index, i);
-			continue;
-		}
-		fch_pic_routing[mb_irq_map[i].intr_index] = mb_irq_map[i].pic_irq_num;
-		fch_apic_routing[mb_irq_map[i].intr_index] = mb_irq_map[i].apic_irq_num;
-	}
-}
-
-static void pirq_setup(void)
-{
-	intr_data_ptr = fch_apic_routing;
-	picr_data_ptr = fch_pic_routing;
-}
-
 static void mainboard_configure_gpios(void)
 {
 	size_t base_num_gpios, override_num_gpios;
@@ -219,10 +181,6 @@
 
 	dev->ops->acpi_fill_ssdt = mainboard_fill_ssdt;
 
-	init_tables();
-	/* Initialize the PIRQ data structures for consumption */
-	pirq_setup();
-
 	/* TODO: b/184678786 - Move into espi_config */
 	/* Unmask eSPI IRQ 1 (Keyboard) */
 	pm_write32(PM_ESPI_INTR_CTRL, PM_ESPI_DEV_INTR_MASK & ~(BIT(1)));