diff --git a/_constraints b/_constraints
new file mode 100644
index 0000000..4496146
--- /dev/null
+++ b/_constraints
@@ -0,0 +1,7 @@
+<constraints>
+  <hardware>
+    <disk>
+      <size unit="G">5</size>
+    </disk>
+  </hardware>
+</constraints>
diff --git a/go1.19.changes b/go1.19.changes
index ecaf6ca..00f2d1d 100644
--- a/go1.19.changes
+++ b/go1.19.changes
@@ -1,3 +1,22 @@
+-------------------------------------------------------------------
+Mon Aug 22 20:44:19 UTC 2022 - Jeff Kowalczyk <jkowalczyk@suse.com>
+
+- Define go_bootstrap_version go1.16 without suse_version checks
+- Simplify conditional gcc_go_version 12 on Tumbleweed, 11 elsewhere
+- Add _constraints for worker disk space 5G needed by SLE-15 x86_64
+- SLE-12 s390x use bcond_without gccgo to bootstrap using gcc11go
+  * Workaround for SLE-12 s390x build error while writing linker data:
+    bad carrier sym for symbol crypto/internal/nistec.p256OrdMul.args_stackmap
+    created by cmd/link/internal/ld.writeBlocks
+	/usr/lib64/go/1.19/src/cmd/link/internal/ld/data.go:958
+
+-------------------------------------------------------------------
+Fri Aug 19 17:53:40 UTC 2022 - Dirk Müller <dmueller@suse.com>
+
+- Bootstrap using go1.16 on SLE-15 and newer. go1.16 is
+  bootstrapped using gcc-go 11 or 12. This allows dropping older
+  versions of Go from Factory.
+
 -------------------------------------------------------------------
 Tue Aug  9 05:56:23 UTC 2022 - Jeff Kowalczyk <jkowalczyk@suse.com>
 
diff --git a/go1.19.spec b/go1.19.spec
index cc0f73c..3be5d98 100644
--- a/go1.19.spec
+++ b/go1.19.spec
@@ -24,36 +24,25 @@
 %undefine _build_create_debug
 %define __arch_install_post export NO_BRP_STRIP_DEBUG=true NO_BRP_AR=true
 
+# Used to bootstrap go toolchain with specific existing package
+%define go_bootstrap_version go1.16
+
+# Used to bootstrap go toolchain using specific version of gcc-go
+%if 0%{?suse_version} > 1500
+# openSUSE Tumbleweed
+%define gcc_go_version 12
+%else
+%define gcc_go_version 11
+%endif
+
+# Bootstrap go toolchain using existing go package go_bootstrap_version
+# To bootstrap using gccgo use '--with gccgo'
+%bcond_with gccgo
+
+# Boostrapping using existing go package can fail on certain SLE-12 architectures
+# Override here as needed
 %if 0%{?suse_version} == 1315
-%define gcc_go_version 8
-%define go_bootstrap_version go1.4
-%else
-%ifarch riscv64
-%define go_bootstrap_version go1.14
-%else
-%define go_bootstrap_version go1.9
-%endif
-%if 0%{?sle_version} == 150000
-# SLE15 or Leap 15.x
-%define gcc_go_version 7
-%else
-%define gcc_go_version 9
-%endif
-%endif
-
-# By default use go and not gccgo
-%bcond_with    gccgo
-
-# The fallback boostrap method via %%{go_bootstrap_version} would work for Leap
-# but we don't have %%{go_bootstrap_version} in there. Same for SLE15+
-#if ( 0%{?suse_version} < 1550 && 0%{?is_opensuse} ) || ( 0%{?suse_version} >= 1500 && ! 0%{?is_opensuse} )
-#bcond_without gccgo
-#endif
-
-# The fallback bootstrap method via go1.4 doesn't work
-# for aarch64 nor ppc64le because go 1.4 did not support that architecture.
-%if 0%{?suse_version} == 1315
-%ifarch aarch64 ppc64le ppc64 s390x
+%ifarch aarch64 ppc64le ppc64
 %bcond_without gccgo
 %endif
 %endif
@@ -422,7 +411,6 @@ fi
 %endif
 
 %files doc
-%defattr(-,root,root,-)
 %doc %{_docdir}/go/%{go_label}/*.html
 
 %ifarch %{tsan_arch}