On Tue, Dec 30, 2014 at 11:23:14AM +0000, Hanjun Guo wrote:
On 2014年12月25日 01:18, Catalin Marinas wrote:
On Fri, Oct 17, 2014 at 02:37:14PM +0100, Hanjun Guo wrote:
+Booting using ACPI tables +------------------------- +The only defined method for passing ACPI tables to the kernel on ARMv8 +is via the UEFI system configuration table.
+Processing of ACPI tables may be disabled by passing acpi=off on the kernel +command line; this is the default behavior. If acpi=force is used, the kernel +will ONLY use device configuration information contained in the ACPI tables.
See my comments to Al around the defaults. I think if only ACPI tables are present, we shouldn't panic the kernel if acpi=force is missing but continue with ACPI.
I think we need another patch to implement it, for this patch set,kernel will panic if no dtb and acpi=off.
If no dtb and acpi=off on the kernel command line, I agree that the kernel should panic as it doesn't have any way to get the platform description.
since passing no DT tables to OS but acpi=force is missing is a corner case, we can do a follow up patch to fix that, does it make sense?
Not entirely. Why would no dtb and no acpi=force be a corner case? I thought this should be the default when only ACPI tables are passed, no need for an additional acpi=force argument.