On Wed, Sep 09, 2015 at 12:25:45PM +0800, Shannon Zhao wrote: > > > On 2015/9/8 21:04, Leif Lindholm wrote: > > On Tue, Sep 08, 2015 at 11:18:27AM +0800, Shannon Zhao wrote: > >> On 2015/9/7 22:23, Leif Lindholm wrote: > >>> The Debug Port Table 2 (DBG2) is mandated by the ARM Server Base Boot > >>> Requirements specification. Add the DBG2 table definitions, and set up > >>> an entry in the ARM virt machine for the pl011 UART. > >> > >> Looking at Documentation/arm64/acpi_object_usage.txt in Linux kernel, it > >> says > >> " > >> DBG2 Signature Reserved (signature == "DBG2") > >> == DeBuG port table 2 == > >> Microsoft only table, will not be supported. > >> " > >> It seems that Linux kernel doesn't support or need it, but Windows > >> requires it. So does it need to test this on Windows? > > > > No, it can be tested under Linux with the set I just sent out: > > http://lists.infradead.org/pipermail/linux-arm-kernel/2015-September/368614.html > > So you need to change Documentation/arm64/acpi_object_usage.txt as well. > But that is kernel side.
I also wonder if Documentation/arm64/arm-acpi.txt should have its "Booting using ACPI tables" section updated to reference (describe even?) the use of SPCR. Maybe Leif's already doing that with the this-time-really-for-upstream kernel spcr patches. drew
