buildroot: update to 2019.11

qemu: update to v4.2.0

linux: update to v5.4.3

README.adoc

@@ -1,5 +1,5 @@
 = Linux Kernel Module Cheat
-:description: The perfect emulation setup to study and develop the <<linux-kernel>> v5.2.1, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 18.04 host.
+:description: The perfect emulation setup to study and develop the <<linux-kernel>> v5.4.3, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 19.10 host.
 :idprefix:
 :idseparator: -
 :nofooter:

buildroot_config/default

@@ -1,3 +1,7 @@
+## Non-default versions of our submodules.
+#BR2_BINUTILS_VERSION_2_32_X=y
+#BR2_GCC_VERSION_9_X=y
+
 # Toolchain options.
 # Enable as much visibility as possible.
 BR2_CCACHE=y
@@ -41,3 +45,7 @@ BR2_PACKAGE_HOST_DTC=y
 # such as /etc/network/interfaces which we need. So we just
 # remove the init.d file for now.
 #BR2_PACKAGE_IFUPDOWN_SCRIPTS=n
+
+# Buildroot 2019.11 automatically builds QEMU for qemu_x86_64_defconfig.
+# But we build our own.
+BR2_PACKAGE_HOST_QEMU=n