| Message ID | 20230525164803.17992-4-sunilvl@ventanamicro.com |
|---|---|
| State | New |
| Headers | show |
| Series | hw/riscv/virt: pflash improvements | expand |
On 25/5/23 18:48, Sunil V L wrote: > pflash devices can be used in virt machine for different > purposes like for ROM code or S-mode FW payload. Add a > section in the documentation on how to use pflash devices > for different purposes. > > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> > --- > docs/system/riscv/virt.rst | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > > diff --git a/docs/system/riscv/virt.rst b/docs/system/riscv/virt.rst > index 4b16e41d7f..c3e0b7a9c3 100644 > --- a/docs/system/riscv/virt.rst > +++ b/docs/system/riscv/virt.rst > @@ -53,6 +53,35 @@ with the default OpenSBI firmware image as the -bios. It also supports > the recommended RISC-V bootflow: U-Boot SPL (M-mode) loads OpenSBI fw_dynamic > firmware and U-Boot proper (S-mode), using the standard -bios functionality. > > +Using flash devices > +------------------- > + > +The first flash device (pflash0) can contain either ROM code > +or S-mode payload firmware code. If the pflash0 contains the > +ROM code, -bios should be set to none. If -bios is not set to > +none, pflash0 is assumed to contain S-mode payload code. > + > +Firmware images used for pflash should be of size 32 MiB. > + > +To boot as ROM code: If "ROM" ... > + > +.. code-block:: bash > + > + $ qemu-system-riscv64 -bios none \ > + -blockdev node-name=pflash0,driver=file,filename=<rom_code> \ ... shouldn't we also enforce 'read-only=on,' ... > + -M virt,pflash0=pflash0 \ > + ... other args .... > + > +To boot as read-only S-mode payload: > + > +.. code-block:: bash > + > + $ qemu-system-riscv64 \ > + -blockdev node-name=pflash0,driver=file,read-only=on,filename=<s-mode_fw_code> \ ... like in S-mode? > + -blockdev node-name=pflash1,driver=file,filename=<s-mode_fw_vars> \ > + -M virt,pflash0=pflash0,pflash1=pflash1 \ > + ... other args .... > + > Machine-specific options > ------------------------ >
diff --git a/docs/system/riscv/virt.rst b/docs/system/riscv/virt.rst index 4b16e41d7f..c3e0b7a9c3 100644 --- a/docs/system/riscv/virt.rst +++ b/docs/system/riscv/virt.rst @@ -53,6 +53,35 @@ with the default OpenSBI firmware image as the -bios. It also supports the recommended RISC-V bootflow: U-Boot SPL (M-mode) loads OpenSBI fw_dynamic firmware and U-Boot proper (S-mode), using the standard -bios functionality. +Using flash devices +------------------- + +The first flash device (pflash0) can contain either ROM code +or S-mode payload firmware code. If the pflash0 contains the +ROM code, -bios should be set to none. If -bios is not set to +none, pflash0 is assumed to contain S-mode payload code. + +Firmware images used for pflash should be of size 32 MiB. + +To boot as ROM code: + +.. code-block:: bash + + $ qemu-system-riscv64 -bios none \ + -blockdev node-name=pflash0,driver=file,filename=<rom_code> \ + -M virt,pflash0=pflash0 \ + ... other args .... + +To boot as read-only S-mode payload: + +.. code-block:: bash + + $ qemu-system-riscv64 \ + -blockdev node-name=pflash0,driver=file,read-only=on,filename=<s-mode_fw_code> \ + -blockdev node-name=pflash1,driver=file,filename=<s-mode_fw_vars> \ + -M virt,pflash0=pflash0,pflash1=pflash1 \ + ... other args .... + Machine-specific options ------------------------
pflash devices can be used in virt machine for different purposes like for ROM code or S-mode FW payload. Add a section in the documentation on how to use pflash devices for different purposes. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> --- docs/system/riscv/virt.rst | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+)