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docs: deprecated: Update the -bios documentation

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Update the -bios deprecation documentation to describe the new
behaviour.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
This commit is contained in:
Alistair Francis 2020-05-28 10:55:13 -07:00
parent 1a9540d1f1
commit f33559a427
1 changed files with 11 additions and 13 deletions
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docs/system/deprecated.rst
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@ -138,25 +138,23 @@ the backing storage specified with ``-mem-path`` can actually provide
the guest RAM configured with ``-m`` and QEMU will fail to start up if
RAM allocation is unsuccessful.
RISC-V ``-bios`` (since 4.1)
RISC-V ``-bios`` (since 5.1)
''''''''''''''''''''''''''''
QEMU 4.1 introduced support for the -bios option in QEMU for RISC-V for the
RISC-V virt machine and sifive_u machine.
RISC-V virt machine and sifive_u machine. QEMU 4.1 had no changes to the
default behaviour to avoid breakages.
QEMU 4.1 has no changes to the default behaviour to avoid breakages. This
default will change in a future QEMU release, so please prepare now. All users
of the virt or sifive_u machine must change their command line usage.
QEMU 5.1 changes the default behaviour from ``-bios none`` to ``-bios default``.
QEMU 4.1 has three options, please migrate to one of these three:
1. ``-bios none`` - This is the current default behavior if no -bios option
is included. QEMU will not automatically load any firmware. It is up
QEMU 5.1 has three options:
1. ``-bios default`` - This is the current default behavior if no -bios option
is included. This option will load the default OpenSBI firmware automatically.
The firmware is included with the QEMU release and no user interaction is
required. All a user needs to do is specify the kernel they want to boot
with the -kernel option
2. ``-bios none`` - QEMU will not automatically load any firmware. It is up
to the user to load all the images they need.
2. ``-bios default`` - In a future QEMU release this will become the default
behaviour if no -bios option is specified. This option will load the
default OpenSBI firmware automatically. The firmware is included with
the QEMU release and no user interaction is required. All a user needs
to do is specify the kernel they want to boot with the -kernel option
3. ``-bios <file>`` - Tells QEMU to load the specified file as the firmwrae.
``-tb-size`` option (since 5.0)