.. 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_LOADADDR*. 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.