qfw list qfw cpus qfw load [kernel_addr [initrd_addr]]
The qfw command is used to retrieve information from 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.
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:
$ 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)
The qfw command is only available if CONFIG_CMD_QFW=y.