2021-02-20 09:00:19 +00:00
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.. SPDX-License-Identifier: GPL-2.0+
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qfw command
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===========
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Synopsis
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--------
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::
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qfw list
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qfw cpus
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qfw load [kernel_addr [initrd_addr]]
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Description
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-----------
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The *qfw* command is used to retrieve information form the QEMU firmware.
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The *qfw list* sub-command displays the QEMU firmware files.
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The *qfw cpus* sub-command displays the available CPUs.
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The *qfw load* command is used to load a kernel and an initial RAM disk.
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kernel_addr
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address to which the file specified by the -kernel parameter of QEMU shall
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be loaded. Defaults to environment variable *loadaddr* and further to
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2021-08-23 14:25:29 +00:00
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the value of *CONFIG_SYS_LOAD_ADDR*.
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2021-02-20 09:00:19 +00:00
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initrd_addr
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address to which the file specified by the -initrd parameter of QEMU shall
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be loaded. Defaults to environment variable *ramdiskaddr* and further to
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2022-12-04 15:13:39 +00:00
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the value of *CFG_RAMDISK_ADDR*.
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2021-02-20 09:00:19 +00:00
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Examples
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--------
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QEMU firmware files are listed via the *qfw list* command:
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::
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=> qfw list
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etc/boot-fail-wait
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etc/smbios/smbios-tables
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etc/smbios/smbios-anchor
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etc/e820
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genroms/kvmvapic.bin
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genroms/linuxboot.bin
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etc/system-states
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etc/acpi/tables
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etc/table-loader
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etc/tpm/log
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etc/acpi/rsdp
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bootorder
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The available CPUs can be shown via the *qfw cpus* command:
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::
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=> qfw cpu
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2 cpu(s) online
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The *-kernel* and *-initrd* parameters allow to specify a kernel and an
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initial RAM disk for QEMU:
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.. code-block:: bash
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$ qemu-system-x86_64 -machine pc-i440fx-2.5 -bios u-boot.rom -m 1G \
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-nographic -kernel vmlinuz -initrd initrd
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Now the kernel and the initial RAM disk can be loaded to the U-Boot memory via
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the *qfw load* command and booted thereafter.
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::
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=> qfw load ${kernel_addr_r} ${ramdisk_addr_r}
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loading kernel to address 0000000001000000 size 5048f0 initrd 0000000004000000 size 3c94891
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=> zboot 1000000 5048f0 4000000 3c94891
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Valid Boot Flag
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Magic signature found
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Linux kernel version 4.19.0-14-amd64 (debian-kernel@lists.debian.org) #1 SMP Debian 4.19.171-2 (2021-01-30)
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Building boot_params at 0x00090000
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Loading bzImage at address 100000 (5260160 bytes)
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Configuration
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-------------
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The qfw command is only available if CONFIG_CMD_QFW=y.
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