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- .. SPDX-License-Identifier: GPL-2.0+
- qfw command
- ===========
- Synopsis
- --------
- ::
- qfw list
- qfw cpus
- qfw load [kernel_addr [initrd_addr]]
- Description
- -----------
- The *qfw* command is used to retrieve information form the QEMU firmware.
- The *qfw list* sub-command displays the QEMU firmware files.
- The *qfw cpus* sub-command displays the available CPUs.
- The *qfw load* command is used to load a kernel and an initial RAM disk.
- kernel_addr
- address to which the file specified by the -kernel parameter of QEMU shall
- be loaded. Defaults to environment variable *loadaddr* and further to
- the value of *CONFIG_SYS_LOAD_ADDR*.
- initrd_addr
- address to which the file specified by the -initrd parameter of QEMU shall
- be loaded. Defaults to environment variable *ramdiskaddr* and further to
- the value of *CFG_RAMDISK_ADDR*.
- Examples
- --------
- QEMU firmware files are listed via the *qfw list* command:
- ::
- => qfw list
- 00000000 bios-geometry
- 00000000 bootorder
- 000f0060 etc/acpi/rsdp
- bed14040 etc/acpi/tables
- 00000000 etc/boot-fail-wait
- 00000000 etc/e820
- 00000000 etc/smbios/smbios-anchor
- 00000000 etc/smbios/smbios-tables
- 00000000 etc/system-states
- 00000000 etc/table-loader
- 00000000 etc/tpm/log
- 00000000 genroms/kvmvapic.bin
- Where an address is shown, it indicates where the data is available for
- inspection, e.g. using the :doc:`md`.
- The available CPUs can be shown via the *qfw cpus* command:
- ::
- => qfw cpu
- 2 cpu(s) online
- The *-kernel* and *-initrd* parameters allow to specify a kernel and an
- initial RAM disk for QEMU:
- .. code-block:: bash
- $ qemu-system-x86_64 -machine pc-i440fx-2.5 -bios u-boot.rom -m 1G \
- -nographic -kernel vmlinuz -initrd initrd
- Now the kernel and the initial RAM disk can be loaded to the U-Boot memory via
- the *qfw load* command and booted thereafter.
- ::
- => qfw load ${kernel_addr_r} ${ramdisk_addr_r}
- loading kernel to address 0000000001000000 size 5048f0 initrd 0000000004000000 size 3c94891
- => zboot 1000000 5048f0 4000000 3c94891
- Valid Boot Flag
- Magic signature found
- Linux kernel version 4.19.0-14-amd64 (debian-kernel@lists.debian.org) #1 SMP Debian 4.19.171-2 (2021-01-30)
- Building boot_params at 0x00090000
- Loading bzImage at address 100000 (5260160 bytes)
- Configuration
- -------------
- The qfw command is only available if CONFIG_CMD_QFW=y.
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