November 19, 2022
Dear All, Execute me. I need your help. I am interested in qemu x86_64 and I have a problem that I want to input u-boot into a sdcard file and start Linux with the sdcard file, like grub-install(grub2) way. The grub2 method (Method 1) is right, I want to use u-boot method (Method 2) to bootloader Linux kernel in x86. I guess that it needs write a program like grub-install to reach this aim. Please help me to give a clear way like grub-install way. Thanks! My steps: cd ~/Code/kernel_sources git clone https://github.com/qemu/u-boot.git git checkout v2022.10-rc4 git reset --hard cd ~/Code/kernel_sources/u-boot export ARCH=arm export CROSS_COMPILE=arm-linux-gnueabi- make distclean make vexpress_ca9x4_defconfig make -j4 all # Busybox and rootfs is ready ... # Kernel cd ~/Code/kernel_sources/linux-4.19.256 export ARCH=arm export CROSS_COMPILE=arm-linux-gnueabi- make clean make bzImage -j2 ARCH=arm CROSS_COMPLIE=arm-linux-gnueabi- make dtbs cd ~/Code/kernel_sources/linux-4.19.256 # Create rootfs.img sudo sh -c 'find . | cpio -o --format=newc > ../initrd.img' # Common disk method cd ~/Code/kernel_sources/linux-4.19.256 rm -rf busybox_u-boot_64M_4.19.256.img dd if=/dev/zero of=busybox_u-boot_64M_4.19.256.img bs=1 seek=63MiB count=1024 cd ~/Code/kernel_sources/linux-4.19.256 sudo parted busybox_u-boot_64M_4.19.256.img mklabel msdos mkpart primary ext4 2MiB 98% toggle 1 boot print quit sudo kpartx -a busybox_u-boot_64M_4.19.256.img echo y | sudo mkfs.ext4 /dev/mapper/loop0p1 cd ~/Code/kernel_sources/linux-4.19.256 sudo rm -rf /mnt/rootfs/* sudo mkdir -p /mnt/rootfs/boot/ sudo cp arch/arm/boot/zImage /mnt/rootfs/boot/zImage sudo cp initrd.img /mnt/rootfs/boot/initrd.img # Method 1(Grub2): # Common disk method + Grub method cd ~/Code/kernel_sources/linux-4.19.256/ sudo losetup /dev/loop0 busybox_grub_2G_4.19.256.img sudo kpartx -a /dev/loop0 sudo grub-install --target=i386-pc --recheck --no-floppy --boot-directory=/mnt/rootfs/boot/ /dev/loop0 cd /mnt/rootfs/boot/grub/ sudo sh -c "cat > grub.cfg << EOF set timeout=5 set default=0 menuentry 'Linux 4.19.256, busybox, root=/dev/sda2' { linux /boot/zImage root=/dev/sda2 initrd /boot/initrd.img } menuentry 'Reboot' { reboot } menuentry 'Shutdown' { halt } EOF" cd ~/Code/kernel_sources/linux-4.19.256 qemu-system-x86_64 -m 1024M -drive format=raw,file=busybox_grub_2G_4.19.256.img -curses It can run successfully. # Method 2(U-boot): # Common disk method + U-boot method cd ~/Code/kernel_sources/linux-4.19.256 dd if=~/Code/kernel_sources/u-boot/u-boot.bin of=busybox_u-boot_64M_4.19.256_usb.img conv=notrunc bs=1 cd ~/Code/kernel_sources/linux-4.19.256 qemu-system-arm -M vexpress-a9 \ -nographic \ -m 1024M \ -sd ./busybox_u-boot_64M_4.19.256.img ... It's can't start u-boot. How use u-boot in sdcard file like grub-install? Thanks! Sincerely, Ronggang Huang 2022.11.19
