A bunch of tiny fixes

README.adoc

@@ -1110,9 +1110,9 @@ wc -l trace-boot.txt
 gem5:
 
 ....
-./run -a arm -g -e 'init=/eval.sh - lkmc_eval="m5 exit"' -n
+./run -a arm -g -e 'init=/eval.sh - lkmc_eval="m5 exit"'
 # Or:
-# ./run -a arm -g -e 'init=/eval.sh - lkmc_eval="m5 exit"' -n -- --cpu-type=HPI --caches
+# ./run -a arm -g -e 'init=/eval.sh - lkmc_eval="m5 exit"' -- --cpu-type=HPI --caches
 grep sim_insts m5out/stats.txt
 ....
 

build

@@ -114,6 +114,9 @@ BR2_ROOTFS_POST_SCRIPT_ARGS=\"$post_script_args\"
     # http://lists.busybox.net/pipermail/buildroot/2017-August/201053.html
     sed -Ei 's/^BR2_PACKAGE_LINUX_TOOLS_GPIO/BR2_PACKAGE_LINUX_TOOLS_GPIO=n/' "${config_file}"
   fi
+  # TODO why is this needed. Otherwise kernel .config does not change, even though Buildroot
+  # .config did due to -K. even if we are running linux-kernel-reconfigure!
+  rm -f "${out_dir}/build/linux-custom/.config"
   if [ -n "$linux_kernel_custom_config_file" ]; then
     printf "BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE=\"../${linux_kernel_custom_config_file}\"\n" >> "${config_file}"
   fi

gem5/build

@@ -1,12 +1,16 @@
 #/usr/bin/env bash
 set -eu
 arch=x86_64
+cross_compile=''
 j=''
-while getopts a:j: OPT; do
+while getopts a:c:j: OPT; do
   case "$OPT" in
     a)
       arch="$OPTARG"
       ;;
+    c)
+      cross_compile="CROSS_COMPILE=$OPTARG"
+      ;;
     j)
       j="$OPTARG"
       ;;
@@ -22,6 +26,9 @@ binaries_dir="${system_dir}/binaries"
 disks_dir="${system_dir}/disks"
 mkdir -p "$binaries_dir" "$disks_dir"
 cd "${top}/gem5"
+
+TARGET_CROSS=
+
 if [ "$arch" = x86_64 ]; then
   CC=gcc-6 CXX=g++-6 scons -j"$j" --ignore-style build/X86/gem5.opt
   f="${disks_dir}/linux-bigswap2.img"
@@ -34,11 +41,12 @@ elif [ "$arch" = arm ] || [ "$arch" = aarch64 ]; then
   # Compilation fails with gcc 7 on that commit.
   # There were some recent portability patches, so it will likely get there soon.
   CC=gcc-6 CXX=g++-6 scons -j"$j" --ignore-style build/ARM/gem5.opt
-  make -C ./system/arm/dt
+  make -C ./system/arm/dt/
   # TODO use the buildroot cross compiler here, and remove the dependencies from configure.
-  make -C ./system/arm/simple_bootloader
-  make -C ./system/arm/aarch64_bootloader/
+  make -C ./system/arm/simple_bootloader/ $cross_compile
   cp ./system/arm/simple_bootloader/boot_emm.arm "$binaries_dir"
+  # TODO cross_compile is ignored because the make does not use CC...
+  make -C ./system/arm/aarch64_bootloader/ $cross_compile
   cp ./system/arm/aarch64_bootloader/boot_emm.arm64 "$binaries_dir"
 fi
 # TODO vs telnet?

gem5/external.mk

@@ -15,7 +15,7 @@ ARCH_MAKE = $(ARCH)
 endif
 
 define GEM5_BUILD_CMDS
-	cd '$(@D)' && ./build -a '$(ARCH)' -j '$(BR2_JLEVEL)'
+	cd '$(@D)' && ./build -a '$(ARCH)' -c '$(TARGET_CROSS)' -j '$(BR2_JLEVEL)'
 	cd '$(@D)/gem5/util/m5' && $(MAKE) -f 'Makefile.$(ARCH_MAKE)' CC='$(TARGET_CC)' LD='$(TARGET_LD)'
 endef
 

run

@@ -8,7 +8,6 @@ cpus=1
 debug_vm=''
 kgdb=false
 kvm=false
-nographic=false
 # norandmaps: Don't use address space randomization. Equivalent to echo 0 > /proc/sys/kernel/randomize_va_space.
 # printk.time=y: log in format: "[time ] msg" for all printk messages.
 # nokaslr: https://unix.stackexchange.com/questions/397939/turning-off-kaslr-to-debug-linux-kernel-using-qemu-and-gdb
@@ -59,7 +58,6 @@ while getopts a:c:Dde:G:giKknt:x OPT; do
     n)
       extra_append="$extra_append console=ttyS0"
       extra_flags_qemu="$extra_flags -nographic"
-      nographic=true
       ;;
   esac
 done
@@ -115,7 +113,7 @@ else
   extra_flags="${extra_flags_qemu} ${extra_flags}"
   images_dir="${out_dir}/images"
   qemu_common="\
-'${debug_vm}' \
+${debug_vm} \
 '${out_dir}/host/usr/bin/qemu-system-${arch}' \
 -m 128M \
 -monitor telnet::45454,server,nowait \