Re: [Xen-devel] Design doc of adding ACPI support for arm64 on Xen - version 3

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi,

On 17/08/2015 06:01, Shannon Zhao wrote:
> On 2015/8/14 23:17, Julien Grall wrote:
> > On 14/08/15 15:59, Shannon Zhao wrote:
> > > 2. Create minimal DT to pass required information to Dom0
> > > ----------------------------------------------------------
> > > The minimal DT mainly passes Dom0 bootargs, address and size of initrd
> > > (if available), address and size of uefi system table, address and size
> > > of uefi memory table, uefi-mmap-desc-size and uefi-mmap-desc-ver.
> > >
> > > An example of the minimal DT:
> > > / {
> > >      #address-cells = <2>;
> > >      #size-cells = <1>;
> > >      chosen {
> > >          bootargs = "kernel=Image console=hvc0 earlycon=pl011,0x1c090000
> > > root=/dev/vda2 rw rootfstype=ext4 init=/bin/sh acpi=force";
> > >          linux,initrd-start = <0xXXXXXXXX>;
> > >          linux,initrd-end = <0xXXXXXXXX>;
> > >          linux,uefi-system-table = <0xXXXXXXXX>;
> > >          linux,uefi-mmap-start = <0xXXXXXXXX>;
> > >          linux,uefi-mmap-size = <0xXXXXXXXX>;
> > >          linux,uefi-mmap-desc-size = <0xXXXXXXXX>;
> > >          linux,uefi-mmap-desc-ver = <0xXXXXXXXX>;
> > >      };
> > > };
> > >
> > > For details loook at
> > > https://github.com/torvalds/linux/blob/master/Documentation/arm/uefi.txt
> > I would have expect a summary on the discussion we had on the previous
> > thread [1].
> >
> > Note that "linux,initrd-*" are well defined given that Xen, U-boot and
> > other bootloaders are using them. And IIRC, it's Linux specific.
> >
> > Although, "linux,uefi-*" are not well defined (only used internally by
> > Linux betwen the EFI stub and the kernel) and we expect other OS to use
> > them in the future.
> >
> > So I would prefer to the "linux," dropped for them.
> Yes, I think it's good to drop the "linux," too. But if we drop the
> linux, would it impact the linux kernel booting with UEFI? And why we
> don't do it to Xen since Xen still uses "linux,"?
I don't understand your second question.

For the first question, as we discussed in several mail, the property 
"linux,uefi-*" are only used internally between the stub and Linux. The 
sub is compiled in the kernel so there is no issue to change the property.
Regards,

--
Julien Grall

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