79b8540d62
Following commitfee29b05bb("configs/pc_x86_64_efi: use a GPT partition table"), board/pc/grub-efi.cfg is no longer used anywhere: the post-image-efi-gpt.sh script generates the grub configuration. Also, since post-image-efi-gpt.sh generates a grub configuration file that uses the root filesystem partition UUID as the root= kernel argument, the instructions in the readme.txt file to tweak root= from /dev/sda2 to /dev/vda2 is no longer relevant. This was noted in the commit log offee29b05bb: The root filesystem location is passed to the kernel by a partition UUID, so it is possible to boot on QEMU, directly from the disk image, or dump the image to a physical device. Fixes: #11841 Cc: Pete Morici <pmorici@dev295.com> Cc: Carlos A. M. dos Santos <unixmania@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
73 lines
1.6 KiB
Plaintext
73 lines
1.6 KiB
Plaintext
Bare PC sample config
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=====================
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1. Build
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First select the appropriate target you want.
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For BIOS-based boot strategy:
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$ make pc_x86_64_bios_defconfig
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For EFI-based boot strategy on a GPT-partitioned disk:
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$ make pc_x86_64_efi_defconfig
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Add any additional packages required and build:
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$ make
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2. Write the pendrive
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The build process will create a pendrive image called sdcard.img in
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output/images.
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Write the image to a pendrive:
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$ dd if=output/images/disk.img of=/dev/sdc; sync
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Once it's done insert it into the target PC and boot.
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Remember that if said PC has another boot device you might need to
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select this alternative for it to boot.
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In the case of EFI boot you might need to disable Secure Boot from
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the setup as well.
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3. Enjoy
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Emulation in qemu (BIOS)
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========================
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1. Edit grub-bios.cfg
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Since the driver will show up in the virtual machine as /dev/vda,
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change board/pc/grub-bios.cfg to use root=/dev/vda2 instead of
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root=/dev/sda2. Then rebuild grub2 and the image.
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2. Run the emulation with:
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qemu-system-x86_64 \
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-M pc \
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-drive file=output/images/disk.img,if=virtio,format=raw \
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-net nic,model=virtio \
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-net user
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Emulation in qemu (UEFI)
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========================
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Run the emulation with:
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qemu-system-x86_64 \
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-M pc \
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-bios </path/to/OVMF_CODE.fd> \
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-drive file=output/images/disk.img,if=virtio,format=raw \
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-net nic,model=virtio \
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-net user
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Note that </path/to/OVMF.fd> needs to point to a valid x86_64 UEFI
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firmware image for qemu. It may be provided by your distribution as a
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edk2 or OVMF package, in path such as
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/usr/share/edk2/ovmf/OVMF_CODE.fd .
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