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Date: Thu, 29 Mar 2018 18:53:43 +0100
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From: Marc Zyngier <marc.zyngier@arm.com>
Subject: Re: [PATCH] Extract initrd free logic from arch-specific code.
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To: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>, Oliver <oohall@gmail.com>, Rob Landley <rob@landley.net>, Shea Levy <shea@shealevy.com>, linux-riscv@lists.infradead.org, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Christoph Hellwig <hch@infradead.org>, Richard Henderson <rth@twiddle.net>, Ivan Kokshaysky <ink@jurassic.park.msu.ru>, Matt Turner <mattst88@gmail.com>, Vineet Gupta <vgupta@synopsys.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Mark Salter <msalter@redhat.com>, Aurelien Jacquiot <jacquiot.aurelien@gmail.com>, Mikael Starvik <starvik@axis.com>, Jesper Nilsson <jesper.nilsson@axis.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, Richard Kuo <rkuo@codeaurora.org>, Tony Luck <tony.luck@intel.com>, Fenghua Yu <fenghua.yu@intel.com>, James Hogan <jhogan@kernel.org>, Michal Simek <monstr@monstr.eu>, Ralf Baechle <ralf@linux-mips.org>, David Howells <dhowells@redhat.com>, Ley Foon Tan <lftan@altera.com>, Jonas Bonn <jonas@southpole.se>, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>, Stafford Horne <shorne@gmail.com>, "James E.J. Bottomley" <jejb@parisc-linux.org>, Helge Deller <deller@gmx.de>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, Michael Ellerman <mpe@ellerman.id.au>, Palmer Dabbelt <palmer@sifive.com>, Albert Ou <albert@sifive.com>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, Chen Liqin <liqin.linux@gmail.com>, Lennox Wu <lennox.wu@gmail.com>, Rich Felker <dalias@libc.org>, "David S. Miller" <davem@davemloft.net>, Jeff Dike <jdike@addtoit.com>, Richard Weinberger <richard@nod.at>, Guan Xuetao <gxt@mprc.pku.edu.cn>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, the arch/x86 maintainers <x86@kernel.org>, Chris Zankel <chris@zankel.net>, Max Filippov <jcmvbkbc@gmail.com>, Kate Stewart <kstewart@linuxfoundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Philippe Ombredanne <pombredanne@nexb.com>, Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>, Al Viro <viro@zeniv.linux.org.uk>, Vladimir Murzin <vladimir.murzin@arm.com>, Linus Walleij <linus.walleij@linaro.org>, Michal Hocko <mhocko@suse.com>, Andrew Morton <akpm@linux-foundation.org>, Sudip Mukherjee <sudipm.mukherjee@gmail.com>, Rob Herring <robh@kernel.org>, Kees Cook <keescook@chromium.org>, Vlastimil Babka <vbabka@suse.cz>, Balbir Singh <bsingharora@gmail.com>, Christophe Leroy <christophe.leroy@c-s.fr>, Joe Perches <joe@perches.com>, Dan Williams <dan.j.williams@intel.com>, Wei Yang <richard.weiyang@gmail.com>, Christian =?ISO-8859-1?Q?K=F6nig?= <christian.koenig@amd.com>, Arnd Bergmann <arnd@arndb.de>, Deepa Dinamani <deepa.kernel@gmail.com>, Daniel Thompson <daniel.thompson@linaro.org>, Florian Fainelli <f.fainelli@gmail.com>, alpha <linux-alpha@vger.kernel.org>, arcml <linux-snps-arc@lists.infradead.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, adi-buildroot-devel@lists.sourceforge.net, linux-c6x-dev@linux-c6x.org, Cris <linux-cris-kernel@axis.com>, "moderated list:H8/300 ARCHITECTURE" <uclinux-h8-devel@lists.sourceforge.jp>, "open list:QUALCOMM HEXAGON..." <linux-hexagon@vger.kernel.org>, linux-ia64@vger.kernel.org, linux-m68k <linux-m68k@lists.linux-m68k.org>, "open list:METAG ARCHITECTURE" <linux-metag@vger.kernel.org>, Linux MIPS Mailing List <linux-mips@linux-mips.org>, "moderated list:PANASONIC MN10300..." <linux-am33-list@redhat.com>, nios2-dev@lists.rocketboards.org, Openrisc <openrisc@lists.librecores.org>, Parisc List <linux-parisc@vger.kernel.org>, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, linux-s390 <linux-s390@vger.kernel.org>, Linux-sh list <linux-sh@vger.kernel.org>, sparclinux <sparclinux@vger.kernel.org>, uml-devel <user-mode-linux-devel@lists.sourceforge.net>, uml-user <user-mode-linux-user@lists.sourceforge.net>, linux-xtensa@linux-xtensa.org, Nicholas Piggin <npiggin@gmail.com>
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On Thu, 29 Mar 2018 18:32:47 +0100,
Russell King - ARM Linux wrote:
> 
> On Thu, Mar 29, 2018 at 05:53:14PM +0100, Marc Zyngier wrote:
> > On Thu, 29 Mar 2018 16:58:27 +0100,
> > Russell King - ARM Linux wrote:

[...]

> > > I'm not aware of there being an emulated UART in the guest's address
> > > space, so serial based stuff doesn't work.
> > 
> > "earlycon=uart,mmio,0x3f8" is what you're looking for:
> 
> Does that also mean that we have a RTC at the standard PC IO addresses
> as well, but in mmio space?

There is one, together with an i8042. Not exposed in the DT though.

	M.

-- 
Jazz is not dead, it just smell funny.