[PATCH 2/3] doc: usage: Update vxworks doc to mention RISC-V support

[Heinrich Schuchardt]

On 3/28/22 04:43, Bin Meng wrote:
> At present the doc only mentions Arm, PowerPC and x86. RISC-V support
> has been added since VxWorks SR0650 support for a while, and U-Boot
> supports loading a RISC-V VxWorks kernel too. Let's document it.
> 
> Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
> ---
> 
>   doc/usage/os/vxworks.rst | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/doc/usage/os/vxworks.rst b/doc/usage/os/vxworks.rst
> index e696c639b2..e732f711fb 100644
> --- a/doc/usage/os/vxworks.rst
> +++ b/doc/usage/os/vxworks.rst
> @@ -13,13 +13,13 @@ Status
>   U-Boot supports loading VxWorks kernels via 'bootvx' and 'bootm' commands.
>   For booting old kernels (6.9.x) on PowerPC and ARM, and all kernel versions
>   on other architectures, 'bootvx' shall be used. For booting VxWorks 7 kernels

A man-page for bootvx might be useful.

> -on PowerPC and ARM, 'bootm' shall be used.
> +on PowerPC/ARM/RISC-V, 'bootm' shall be used.
>   
>   With CONFIG_EFI_LOADER option, it's possible to chain load a VxWorks x86 kernel
>   via the UEFI boot loader application for VxWorks loaded by 'bootefi' command.
>   
> -VxWorks 7 on PowerPC and ARM
> -----------------------------
> +VxWorks 7 on PowerPC/ARM/RISC-V
> +-------------------------------
>   From VxWorks 7, VxWorks starts adopting device tree as its hardware description
>   mechanism (for PowerPC and ARM), thus requiring boot interface changes.
>   This section will describe the new interface.
> @@ -45,6 +45,11 @@ For ARM, the calling convention is shown below::
>   When using the Linux compatible standard DTB, the calling convention of VxWorks
>   entry point is exactly the same as the Linux kernel.
>   
> +For RISC-V, there is no legacy bootm flow as VxWorks always uses the same boot
> +interface as the Linux kernel, with the calling convention below::
> +

Nits: .. code-block:: C

Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

> +    void (*kernel_entry)(unsigned long hartid, void *fdt_addr)
> +
>   When booting a VxWorks 7 kernel (uImage format), the parameters passed to bootm
>   is like below::
>