diff --git a/src/soc/amd/cezanne/fsp_m_params.c b/src/soc/amd/cezanne/fsp_m_params.c
index 8da38ff..4aff7e0 100644
--- a/src/soc/amd/cezanne/fsp_m_params.c
+++ b/src/soc/amd/cezanne/fsp_m_params.c
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <amdblocks/apob_cache.h>
+#include <amdblocks/ioapic.h>
 #include <amdblocks/memmap.h>
 #include <assert.h>
 #include <console/uart.h>
@@ -50,6 +51,13 @@
 	fill_ddi_descriptors(mcfg, fsp_ddi, num_ddi);
 }
 
+static void fsp_assign_ioapic_upds(FSP_M_CONFIG *mcfg)
+{
+	mcfg->gnb_ioapic_base = GNB_IO_APIC_ADDR;
+	mcfg->gnb_ioapic_id = GNB_IOAPIC_ID;
+	mcfg->fch_ioapic_id = FCH_IOAPIC_ID;
+}
+
 void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd, uint32_t version)
 {
 	FSP_M_CONFIG *mcfg = &mupd->FspmConfig;
@@ -129,4 +137,5 @@
 		config->telemetry_vddcrsocoffset;
 
 	fsp_fill_pcie_ddi_descriptors(mcfg);
+	fsp_assign_ioapic_upds(mcfg);
 }