Hi Andy,
On Fri, Jan 12, 2018 at 9:01 PM, Andy Shevchenko andriy.shevchenko@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@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