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

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
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@ -52,25 +52,6 @@ pcspk-audiodev=<name>``.
``tty`` and ``parport`` are aliases that will be removed. Instead, the
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)
''''''''''''''''''''''''''''''''''''''

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.
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
------------------------------------

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/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.