kumquat-buildroot/board/pc/readme.txt
Thomas Petazzoni 79b8540d62 board/pc: drop unused grub-efi.cfg file
Following commit fee29b05bb
("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 of fee29b05bb:

    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>
2019-05-10 10:30:15 +02:00

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Bare PC sample config
=====================
1. Build
First select the appropriate target you want.
For BIOS-based boot strategy:
$ make pc_x86_64_bios_defconfig
For EFI-based boot strategy on a GPT-partitioned disk:
$ make pc_x86_64_efi_defconfig
Add any additional packages required and build:
$ make
2. Write the pendrive
The build process will create a pendrive image called sdcard.img in
output/images.
Write the image to a pendrive:
$ dd if=output/images/disk.img of=/dev/sdc; sync
Once it's done insert it into the target PC and boot.
Remember that if said PC has another boot device you might need to
select this alternative for it to boot.
In the case of EFI boot you might need to disable Secure Boot from
the setup as well.
3. Enjoy
Emulation in qemu (BIOS)
========================
1. Edit grub-bios.cfg
Since the driver will show up in the virtual machine as /dev/vda,
change board/pc/grub-bios.cfg to use root=/dev/vda2 instead of
root=/dev/sda2. Then rebuild grub2 and the image.
2. Run the emulation with:
qemu-system-x86_64 \
-M pc \
-drive file=output/images/disk.img,if=virtio,format=raw \
-net nic,model=virtio \
-net user
Emulation in qemu (UEFI)
========================
Run the emulation with:
qemu-system-x86_64 \
-M pc \
-bios </path/to/OVMF_CODE.fd> \
-drive file=output/images/disk.img,if=virtio,format=raw \
-net nic,model=virtio \
-net user
Note that </path/to/OVMF.fd> needs to point to a valid x86_64 UEFI
firmware image for qemu. It may be provided by your distribution as a
edk2 or OVMF package, in path such as
/usr/share/edk2/ovmf/OVMF_CODE.fd .