diff -Nru nvidia-graphics-drivers-390-390.144/debian/changelog nvidia-graphics-drivers-390-390.144/debian/changelog
--- nvidia-graphics-drivers-390-390.144/debian/changelog	2021-09-06 13:45:47.000000000 +0100
+++ nvidia-graphics-drivers-390-390.144/debian/changelog	2021-10-11 12:27:19.000000000 +0100
@@ -1,3 +1,11 @@
+nvidia-graphics-drivers-390 (390.144-0ubuntu3) impish; urgency=medium
+
+  * debian/dkms_nvidia/patches/buildfix_kernel_5.13_armhf.patch,
+    debian/templates/dkms_nvidia.conf.in:
+    - Fix armhf builds. LP: #1946642
+
+ -- Dimitri John Ledkov <dimitri.ledkov@canonical.com>  Mon, 11 Oct 2021 12:27:19 +0100
+
 nvidia-graphics-drivers-390 (390.144-0ubuntu2) impish; urgency=medium
 
   * debian/dkms_nvidia/patches/buildfix_kernel_5.14.patch,
diff -Nru nvidia-graphics-drivers-390-390.144/debian/dkms_nvidia/patches/buildfix_kernel_5.13_armhf.patch nvidia-graphics-drivers-390-390.144/debian/dkms_nvidia/patches/buildfix_kernel_5.13_armhf.patch
--- nvidia-graphics-drivers-390-390.144/debian/dkms_nvidia/patches/buildfix_kernel_5.13_armhf.patch	1970-01-01 01:00:00.000000000 +0100
+++ nvidia-graphics-drivers-390-390.144/debian/dkms_nvidia/patches/buildfix_kernel_5.13_armhf.patch	2021-10-11 12:27:19.000000000 +0100
@@ -0,0 +1,41 @@
+From 875a0a7294cd179c061f0a3104a1386d824bff21 Mon Sep 17 00:00:00 2001
+From: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
+Date: Mon, 11 Oct 2021 12:22:21 +0100
+Subject: [PATCH] Fix ftbfs on armhf, due to outer_sync -> arm_heay_mb change.
+
+BugLink: https://bugs.launchpad.net/bugs/1946642
+Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
+---
+ common/inc/nv-linux.h         | 2 +-
+ nvidia-drm/nvidia-drm-linux.c | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/common/inc/nv-linux.h b/common/inc/nv-linux.h
+index 9a656bfbe6..9ad9d0b1d1 100644
+--- a/common/inc/nv-linux.h
++++ b/common/inc/nv-linux.h
+@@ -464,7 +464,7 @@ extern int nv_pat_mode;
+ #if defined(CONFIG_OUTER_CACHE)
+ #define OUTER_FLUSH_RANGE(start, end)   outer_flush_range((start),(end))
+ #endif
+-#define WRITE_COMBINE_FLUSH()    { dsb(); outer_sync(); }
++#define WRITE_COMBINE_FLUSH()    { dsb(); arm_heavy_mb(); }
+ #elif defined(NVCPU_AARCH64)
+     static inline void nv_flush_cache_cpu(void *info)
+     {
+diff --git a/nvidia-drm/nvidia-drm-linux.c b/nvidia-drm/nvidia-drm-linux.c
+index d9e4ecff40..0962e8a62c 100644
+--- a/nvidia-drm/nvidia-drm-linux.c
++++ b/nvidia-drm/nvidia-drm-linux.c
+@@ -75,7 +75,7 @@ char *nv_drm_asprintf(const char *fmt, ...)
+   #define WRITE_COMBINE_FLUSH()    asm volatile("sfence":::"memory")
+ #elif defined(NVCPU_FAMILY_ARM)
+   #if defined(NVCPU_ARM)
+-    #define WRITE_COMBINE_FLUSH()  { dsb(); outer_sync(); }
++    #define WRITE_COMBINE_FLUSH()  { dsb(); arm_heavy_mb(); }
+   #elif defined(NVCPU_AARCH64)
+     #define WRITE_COMBINE_FLUSH()  mb()
+   #endif
+-- 
+2.30.2
+
diff -Nru nvidia-graphics-drivers-390-390.144/debian/dkms_nvidia.conf nvidia-graphics-drivers-390-390.144/debian/dkms_nvidia.conf
--- nvidia-graphics-drivers-390-390.144/debian/dkms_nvidia.conf	2021-09-06 13:45:47.000000000 +0100
+++ nvidia-graphics-drivers-390-390.144/debian/dkms_nvidia.conf	2021-10-11 12:26:54.000000000 +0100
@@ -26,5 +26,6 @@
 AUTOINSTALL="yes"
 PATCH[0]="disable_fstack-clash-protection_fcf-protection.patch"
 PATCH[1]="buildfix_kernel_5.14.patch"
+PATCH[2]="buildfix_kernel_5.13_armhf.patch"
 #PATCH[1]="do-not-call-pci_save_state.patch"
 #PATCH_MATCH[0]="^4.[6-7]"
diff -Nru nvidia-graphics-drivers-390-390.144/debian/templates/dkms_nvidia.conf.in nvidia-graphics-drivers-390-390.144/debian/templates/dkms_nvidia.conf.in
--- nvidia-graphics-drivers-390-390.144/debian/templates/dkms_nvidia.conf.in	2021-09-06 13:45:02.000000000 +0100
+++ nvidia-graphics-drivers-390-390.144/debian/templates/dkms_nvidia.conf.in	2021-10-11 12:27:06.000000000 +0100
@@ -26,5 +26,6 @@
 AUTOINSTALL="yes"
 PATCH[0]="disable_fstack-clash-protection_fcf-protection.patch"
 PATCH[1]="buildfix_kernel_5.14.patch"
+PATCH[2]="buildfix_kernel_5.13_armhf.patch"
 #PATCH[1]="do-not-call-pci_save_state.patch"
 #PATCH_MATCH[0]="^4.[6-7]"