configs/qemu_loongarch64_virt_efi: new defconfig

Add qemu_loongarch64_virt_efi_defconfig, which builds EDK2
and host QEMU to test LoongArch64 buildroot.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Romain Naour <romain.naour@smile.fr>
Tested-by: Romain Naour <romain.naour@smile.fr>
Reviewed-by: Julien Olivain <ju.o@free.fr>
Tested-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>

DEVELOPERS

@@ -1645,7 +1645,9 @@ F:	package/rtty/
 N:	Jiaxun Yang <jiaxun.yang@flygoat.com>
 F:	arch/Config.in.loongarch
 F:	board/loongarch64-efi
+F:	board/qemu/loongarch64-virt-efi
 F:	configs/loongarch64_efi_defconfig
+F:	configs/qemu_loongarch64_virt_efi_defconfig
 
 N:	Joachim Wiberg <troglobit@gmail.com>
 F:	configs/globalscale_espressobin_defconfig

board/qemu/loongarch64-virt-efi/genimage.cfg

@@ -0,0 +1,30 @@
+image efi-part.vfat {
+	vfat {
+		file EFI {
+			image = "efi-part/EFI"
+		}
+		file vmlinux.efi {
+			image = "vmlinux.efi"
+		}
+	}
+
+	size = 64M
+}
+
+image disk.img {
+	hdimage {
+		partition-table-type = "gpt"
+	}
+
+	partition boot {
+		image = "efi-part.vfat"
+		partition-type-uuid = U
+		offset = 32K
+		bootable = true
+	}
+
+	partition root {
+		partition-type-uuid = root-loongarch64
+		image = "rootfs.ext2"
+	}
+}

board/qemu/loongarch64-virt-efi/grub.cfg

@@ -0,0 +1,6 @@
+set default="0"
+set timeout="5"
+
+menuentry "Buildroot" {
+	linux /vmlinux.efi root=PARTLABEL=root rootwait console=ttyS0
+}

board/qemu/loongarch64-virt-efi/post-image.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+BOARD_DIR="$(dirname "$0")"
+
+cp -f "${BOARD_DIR}/grub.cfg" "${BINARIES_DIR}/efi-part/EFI/BOOT/grub.cfg"

board/qemu/loongarch64-virt-efi/readme.txt

@@ -0,0 +1,31 @@
+Intro
+=====
+
+This is a LoongArch 64bit UEFI Linux boot demo in QEMU virt machine.
+
+Build
+=====
+
+    make qemu_loongarch64_virt-efi_defconfig
+    make
+
+Emulation
+=========
+
+Run the emulation with:
+
+    qemu-system-loongarch64 \
+        -M virt \
+        -smp 2 \
+        -m 1024 \
+        -nographic \
+        -bios output/images/QEMU_EFI.fd \
+        -drive file=output/images/disk.img,format=raw \
+        -netdev user,id=net0 \
+        -device virtio-net-pci,netdev=net0 # qemu_loongarch64_virt_efi_defconfig
+
+Note: for information, qemu version >= 9.0.0 is needed for this UEFI
+Linux demo. The host-qemu package in Buildroot (enabled in this
+defconfig) is sufficient to run this demo. In case another qemu is
+used (for example, from the host OS), make sure to check the version
+requirement.

configs/qemu_loongarch64_virt_efi_defconfig

@@ -0,0 +1,25 @@
+BR2_loongarch64=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_12=y
+BR2_GLOBAL_PATCH_DIR="board/qemu/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/qemu/loongarch64-virt-efi/post-image.sh board/qemu/post-image.sh support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_DEFCONFIG) -c board/qemu/loongarch64-virt-efi/genimage.cfg"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.12.27"
+BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="200M"
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_EDK2=y
+BR2_TARGET_GRUB2=y
+BR2_TARGET_GRUB2_LOONGARCH64_EFI=y
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
+BR2_PACKAGE_HOST_QEMU=y
+BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y