[PATCH] KVM/arm: kernel low level debug support for ARM32 virtual platforms
Russell King - ARM Linux
linux at arm.linux.org.uk
Tue Nov 3 09:33:44 PST 2015
On Tue, Nov 03, 2015 at 11:33:17AM -0500, Christopher Covington wrote:
> > diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> > index a2e16f9..d126bd4 100644
> > --- a/arch/arm/Kconfig.debug
> > +++ b/arch/arm/Kconfig.debug
> > @@ -1155,6 +1155,28 @@ choice
> > This option selects UART0 on VIA/Wondermedia System-on-a-chip
> > devices, including VT8500, WM8505, WM8650 and WM8850.
> > + config DEBUG_VIRT_UART_QEMU
> > + bool "Kernel low-level debugging on QEMU Virtual Platform"
> > + depends on ARCH_VIRT
> > + select DEBUG_UART_PL01X
> > + help
> > + Say Y here if you want the debug print routines to direct
> > + their output to PL011 UART port on QEMU Virtual Platform.
> > + Appropriate address values are:
> > + PHYS VIRT
> > + 0x9000000 0xf8090000
> I thought the only guarantee the virt machine had about the memory map was
> that it would be described in the device tree.
This LL debug stuff is used prior to device tree being parsed.
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