[U-Boot] [PATCH v1 2/2] x86: zImage: Propagate acpi_rsdp_addr to kernel via boot parameters

[Bin Meng]

Hi Andy,

On Fri, Jan 12, 2018 at 9:01 PM, Andy Shevchenko
<andriy.shevchenko at linux.intel.com> wrote:
> On Fri, 2018-01-12 at 17:00 +0800, Bin Meng wrote:
>> Hi Andy,
>>
>> On Thu, Jan 11, 2018 at 1:40 AM, Andy Shevchenko
>> <andriy.shevchenko at linux.intel.com> wrote:
>> > New field acpi_rsdp_addr, which has been introduced in boot protocol
>> > v2.14 [1], in boot parameters tells kernel the exact address of RDSP
>> > ACPI table. Knowing it increases robustness of the kernel by
>> > avoiding
>> > in some cases traversal through a part of physical memory.
>> > It will slightly reduce boot time by the same reason.
>> >
>> > [1] See Linux kernel commit
>> >
>> >   2f74cbf947f4 ("x86/boot: Add the ACPI RSDP address to struct
>> > setup_header::acpi_rdsp_addr")
>>
>> I don't see this commit id in my linux tree. Is this in some
>> custodian's tree?
>
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=2
> f74cbf947f45fa082dda8eac1a1f1299a372f49
>

I checked Linux kernel tree, seems the patch of adding acpi_rdsp_addr
to setup_header was never accepted. Can you please double check, to
see whether we still need this in U-Boot?

I built a v4.17 kernel, and the boot protocol is still 2.13.

Regards,
Bin