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docs/system: Move the RISC-V -bios information to removed

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QEMU 5.1 changed the behaviour of the default boot for the RISC-V virt
and sifive_u machines. This patch moves that change from the
deprecated.rst file to the removed-features.rst file and the
target-riscv.rst.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Message-id: 4f1c261e7f69045ab8bb8926d85fe1d35e48ea5b.1620081256.git.alistair.francis@wdc.com
This commit is contained in:
Alistair Francis 2021-05-04 08:34:32 +10:00
parent 719f0f603c
commit 6debd840c8
3 changed files with 17 additions and 20 deletions
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19
docs/system/deprecated.rst
View file

@ -52,25 +52,6 @@ pcspk-audiodev=<name>``.
``tty`` and ``parport`` are aliases that will be removed. Instead, the ``tty`` and ``parport`` are aliases that will be removed. Instead, the
actual backend names ``serial`` and ``parallel`` should be used. actual backend names ``serial`` and ``parallel`` should be used.
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. QEMU 4.1 had no changes to the
default behaviour to avoid breakages.
QEMU 5.1 changes the default behaviour from ``-bios none`` to ``-bios default``.
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.
3. ``-bios <file>`` - Tells QEMU to load the specified file as the firmwrae.
Short-form boolean options (since 6.0) Short-form boolean options (since 6.0)
'''''''''''''''''''''''''''''''''''''' ''''''''''''''''''''''''''''''''''''''

5
docs/system/removed-features.rst
View file

@ -126,6 +126,11 @@ devices. Drives the board doesn't pick up can no longer be used with
This option was undocumented and not used in the field. This option was undocumented and not used in the field.
Use `-device usb-ccid`` instead. Use `-device usb-ccid`` instead.
RISC-V firmware not booted by default (removed in 5.1)
''''''''''''''''''''''''''''''''''''''''''''''''''''''
QEMU 5.1 changes the default behaviour from ``-bios none`` to ``-bios default``
for the RISC-V ``virt`` machine and ``sifive_u`` machine.
QEMU Machine Protocol (QMP) commands QEMU Machine Protocol (QMP) commands
------------------------------------ ------------------------------------

13
docs/system/target-riscv.rst
View file

@ -70,5 +70,16 @@ undocumented; you can get a complete list by running
riscv/shakti-c riscv/shakti-c
riscv/sifive_u riscv/sifive_u
RISC-V CPU features RISC-V CPU firmware
------------------- -------------------
When using the ``sifive_u`` or ``virt`` machine there are three different
firmware boot options:
1. ``-bios default`` - This is the default behaviour 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.
3. ``-bios <file>`` - Tells QEMU to load the specified file as the firmware.