configs/qemu_hppa_b160l: new defconfig

Add a defconfig to run Linux on a HP Visualize B160L PA-RISC
Workstation, emulated with Qemu.

While at it, add this defconfig to myself in DEVELOPERS.

Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net>
Cc: Romain Naour <romain.naour@gmail.com>
[Julien: update kernel to 6.18.7 to align with other qemu defconfigs]
Signed-off-by: Julien Olivain <ju.o@free.fr>

DEVELOPERS

@@ -3372,8 +3372,10 @@ F:	arch/Config.in.hppa
 F:	arch/arch.mk.hppa
 F:	board/arm/foundation-v8/
 F:	board/bananapi/bananapi-m2-zero/
+F:	board/qemu/hppa-b160l/
 F:	configs/arm_foundationv8_defconfig
 F:	configs/bananapi_m2_zero_defconfig
+F:	configs/qemu_hppa_b160l_defconfig
 F:	configs/uevm5432_defconfig
 F:	package/i7z/
 F:	package/msr-tools/

board/qemu/hppa-b160l/readme.txt

@@ -0,0 +1,33 @@
+Introduction
+============
+
+The qemu_hppa_b160l_defconfig is meant to run Linux on a HP Visualize B160L
+PA-RISC Workstation[1], emulated with Qemu.
+
+Building
+========
+
+  $ make qemu_hppa_b160l_defconfig
+  $ make
+
+Generated files under output/images:
+
+* rootfs.ext4: the root filesystem.
+* vmlinux: the Linux kernel.
+
+Running under Qemu
+==================
+
+Run the emulation with:
+
+  qemu-system-hppa \
+      -machine B160L \
+      -append "rootwait root=/dev/sda" \
+      -hda output/images/rootfs.ext4 \
+      -kernel output/images/vmlinux \
+      -nographic \
+      -smp 2 # qemu_hppa_b160l_defconfig
+
+The login prompt will appear in the terminal that started Qemu.
+
+[1] https://www.openpa.net/systems/hp-visualize_b132l_b160l_b180l.html

configs/qemu_hppa_b160l_defconfig

@@ -0,0 +1,18 @@
+BR2_hppa=y
+BR2_parisc11=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_18=y
+BR2_GLOBAL_PATCH_DIR="board/qemu/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/qemu/post-image.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_DEFCONFIG)"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.18.7"
+BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_PACKAGE_HOST_QEMU=y
+BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y