diff options
Diffstat (limited to 'qemu-options.hx')
| -rw-r--r-- | qemu-options.hx | 98 |
1 files changed, 79 insertions, 19 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index 79e00916a1..3f23a42fa8 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -1585,13 +1585,6 @@ SRST Use file as SecureDigital card image. ERST -DEF("pflash", HAS_ARG, QEMU_OPTION_pflash, - "-pflash file use 'file' as a parallel flash image\n", QEMU_ARCH_ALL) -SRST -``-pflash file`` - Use file as a parallel flash image. -ERST - DEF("snapshot", 0, QEMU_OPTION_snapshot, "-snapshot write to temporary files instead of disk image files\n", QEMU_ARCH_ALL) @@ -3684,12 +3677,67 @@ DEFHEADING() #endif -DEFHEADING(Linux/Multiboot boot specific:) +DEFHEADING(Boot Image or Kernel specific:) +SRST +There are broadly 4 ways you can boot a system with QEMU. + + - specify a firmware and let it control finding a kernel + - specify a firmware and pass a hint to the kernel to boot + - direct kernel image boot + - manually load files into the guest's address space + +The third method is useful for quickly testing kernels but as there is +no firmware to pass configuration information to the kernel the +hardware must either be probeable, the kernel built for the exact +configuration or passed some configuration data (e.g. a DTB blob) +which tells the kernel what drivers it needs. This exact details are +often hardware specific. + +The final method is the most generic way of loading images into the +guest address space and used mostly for ``bare metal`` type +development where the reset vectors of the processor are taken into +account. + +ERST + SRST -When using these options, you can use a given Linux or Multiboot kernel -without installing it in the disk image. It can be useful for easier -testing of various kernels. +For x86 machines and some other architectures ``-bios`` will generally +do the right thing with whatever it is given. For other machines the +more strict ``-pflash`` option needs an image that is sized for the +flash device for the given machine type. + +Please see the :ref:`system-targets-ref` section of the manual for +more detailed documentation. + +ERST + +DEF("bios", HAS_ARG, QEMU_OPTION_bios, \ + "-bios file set the filename for the BIOS\n", QEMU_ARCH_ALL) +SRST +``-bios file`` + Set the filename for the BIOS. +ERST + +DEF("pflash", HAS_ARG, QEMU_OPTION_pflash, + "-pflash file use 'file' as a parallel flash image\n", QEMU_ARCH_ALL) +SRST +``-pflash file`` + Use file as a parallel flash image. +ERST + +SRST + +The kernel options were designed to work with Linux kernels although +other things (like hypervisors) can be packaged up as a kernel +executable image. The exact format of a executable image is usually +architecture specific. + +The way in which the kernel is started (what address it is loaded at, +what if any information is passed to it via CPU registers, the state +of the hardware when it is started, and so on) is also architecture +specific. Typically it follows the specification laid down by the +Linux kernel for how kernels for that architecture must be started. ERST @@ -3729,6 +3777,25 @@ SRST kernel on boot. ERST +SRST + +Finally you can also manually load images directly into the address +space of the guest. This is most useful for developers who already +know the layout of their guest and take care to ensure something sane +will happen when the reset vector executes. + +The generic loader can be invoked by using the loader device: + +``-device loader,addr=<addr>,data=<data>,data-len=<data-len>[,data-be=<data-be>][,cpu-num=<cpu-num>]`` + +there is also the guest loader which operates in a similar way but +tweaks the DTB so a hypervisor loaded via ``-kernel`` can find where +the guest image is: + +``-device guest-loader,addr=<addr>[,kernel=<path>,[bootargs=<arguments>]][,initrd=<path>]`` + +ERST + DEFHEADING() DEFHEADING(Debug/Expert options:) @@ -4179,13 +4246,6 @@ SRST To list all the data directories, use ``-L help``. ERST -DEF("bios", HAS_ARG, QEMU_OPTION_bios, \ - "-bios file set the filename for the BIOS\n", QEMU_ARCH_ALL) -SRST -``-bios file`` - Set the filename for the BIOS. -ERST - DEF("enable-kvm", 0, QEMU_OPTION_enable_kvm, \ "-enable-kvm enable KVM full virtualization support\n", QEMU_ARCH_ARM | QEMU_ARCH_I386 | QEMU_ARCH_MIPS | QEMU_ARCH_PPC | @@ -4239,7 +4299,7 @@ DEF("action", HAS_ARG, QEMU_OPTION_action, " action when guest reboots [default=reset]\n" "-action shutdown=poweroff|pause\n" " action when guest shuts down [default=poweroff]\n" - "-action panic=pause|shutdown|none\n" + "-action panic=pause|shutdown|exit-failure|none\n" " action when guest panics [default=shutdown]\n" "-action watchdog=reset|shutdown|poweroff|inject-nmi|pause|debug|none\n" " action when watchdog fires [default=reset]\n", |