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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 *CONFIG_RAMDISK_ADDR*.
Examples
--------
QEMU firmware files are listed via the *qfw list* command:
::
=> qfw list
etc/boot-fail-wait
etc/smbios/smbios-tables
etc/smbios/smbios-anchor
etc/e820
genroms/kvmvapic.bin
genroms/linuxboot.bin
etc/system-states
etc/acpi/tables
etc/table-loader
etc/tpm/log
etc/acpi/rsdp
bootorder
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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