Re: [External] Re: [PATCH] firmware: added a firmware information passing method FFI

[Ard Biesheuvel]

On Wed, 21 Jun 2023 at 10:04, 运辉崔 <cuiyunhui@xxxxxxxxxxxxx> wrote:
>
> Thanks for Ron's suggestions.
>
> Hi Ard,  Mark,
> >
> > Is there some feeling here that it would be ok to restrict this discussion to risc-v, and not bring in ARM considerations.  WDYT?
> >
>
> Hi Ard,  Mark,
>
> Now the coreboot we are using does not support EFI and only supports
> one interface DTB. It seems that we have to pass the firmware
> information through DTB.
>
> From another point of view, ACPI and SMBIOS are common modules of the
> kernel, not only EFI, but also other interfaces can also be connected
> to this module, such as 0xF0000 for SMBIOS,
> CONFIG_ACPI_LEGACY_TABLES_LOOKUP for ACPI,  this patch is also.
>
> We just use the DTB channel to add a few nodes to complete the
> transfer of firmware information, which does not interfere with DTS
> itself.
>
> We think it is unnecessary to add an ACPI-supporting framework under
> the fdt framework we discussed before. We only need one set of ACPI
> framework, but one more set will cause unnecessary trouble.
>
> So, let's move on to this patch, shall we?
>

How do you intend to provide the ACPI core with the memory attribute
information that it needs to access SystemMemory OpRegions?