diff --git a/coreboot b/coreboot
index 28dab93..3b4db8f 160000
--- a/coreboot
+++ b/coreboot
@@ -1 +1 @@
-Subproject commit 28dab93390612ccd0ae4d758223e664ba57e554b
+Subproject commit 3b4db8f4a7c08c6e5a2c08ab126799a20e1724fb
diff --git a/models/darp6/coreboot.config b/models/darp6/coreboot.config
index aac3a28..4c0dc9c 100644
--- a/models/darp6/coreboot.config
+++ b/models/darp6/coreboot.config
@@ -114,7 +114,7 @@ CONFIG_MAX_REBOOT_CNT=3
 CONFIG_OVERRIDE_DEVICETREE=""
 CONFIG_BOOT_DEVICE_SPI_FLASH_BUS=0
 CONFIG_FMDFILE=""
-CONFIG_DCACHE_BSP_STACK_SIZE=0x20000
+CONFIG_DCACHE_BSP_STACK_SIZE=0x20400
 CONFIG_MMCONF_BASE_ADDRESS=0xe0000000
 CONFIG_HAVE_INTEL_FIRMWARE=y
 # CONFIG_POST_DEVICE is not set
@@ -153,6 +153,7 @@ CONFIG_BOARD_SYSTEM76_DARP6=y
 # CONFIG_BOARD_SYSTEM76_GALP2 is not set
 # CONFIG_BOARD_SYSTEM76_GALP3 is not set
 # CONFIG_BOARD_SYSTEM76_GALP3_B is not set
+# CONFIG_BOARD_SYSTEM76_LEMP9 is not set
 # CONFIG_BOARD_SYSTEM76_THELIO_B1 is not set
 # CONFIG_BOARD_SYSTEM76_GALP3_C is not set
 # CONFIG_BOARD_SYSTEM76_DARP5 is not set
@@ -527,6 +528,10 @@ CONFIG_CARDBUS_PLUGIN_SUPPORT=y
 # CONFIG_AZALIA_PLUGIN_SUPPORT is not set
 CONFIG_PCIEXP_PLUGIN_SUPPORT=y
 CONFIG_PCIEXP_HOTPLUG=y
+CONFIG_PCIEXP_HOTPLUG_BUSES=32
+CONFIG_PCIEXP_HOTPLUG_MEM=0x800000
+CONFIG_PCIEXP_HOTPLUG_PREFETCH_MEM=0x10000000
+CONFIG_PCIEXP_HOTPLUG_IO=0x2000
 # CONFIG_EARLY_PCI_BRIDGE is not set
 CONFIG_INTEL_GMA_HAVE_VBT=y
 CONFIG_INTEL_GMA_ADD_VBT=y