From: Elliott Mitchell <ehem+xen@m5p.com>
To: Masami Hiramatsu <masami.hiramatsu@linaro.org>
Cc: Julien Grall <julien@xen.org>,
xen-devel@lists.xenproject.org,
Alex Benn??e <alex.bennee@linaro.org>,
bertrand.marquis@arm.com, andre.przywara@arm.com,
Julien Grall <jgrall@amazon.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
George Dunlap <george.dunlap@citrix.com>,
Ian Jackson <iwj@xenproject.org>, Jan Beulich <jbeulich@suse.com>,
Wei Liu <wl@xen.org>, Roger Pau Monn?? <roger.pau@citrix.com>
Subject: Xen-ARM EFI/ACPI problems (was: Re: [PATCH 0/4] xen/arm: Unbreak ACPI)
Date: Fri, 16 Oct 2020 15:33:23 -0700 [thread overview]
Message-ID: <20201016223323.GA23508@mattapan.m5p.com> (raw)
In-Reply-To: <CAA93ih2EiyCnuL4sw1OLw+XEWa7sN3zJWvsnxHfx9b9Fq+cOxw@mail.gmail.com>
On Mon, Sep 28, 2020 at 10:00:35PM +0900, Masami Hiramatsu wrote:
> I've missed the explanation of the attached patch. This prototype
> patch was also needed for booting up the Xen on my box (for the system
> which has no SPCR).
I'm pretty sure of this on the hardware I'm dealing with, but don't know
about the hardware you're dealing with.
Does your device have a framebuffer? Have you ever tried/succeeded
booting your device with the framebuffer disabled? (booted with a
HDMI/DVI cable disconnected or the device on the other end *completely*
powered down)
Based upon the back and forth both on xen-devel and some messages which
were split off due to not being general. An observation I had made a
while ago finally caused me to try recreating it.
On the device I'm on (Raspberry PI 4B with Tianocore -> GRUB -> Xen) I
discovered a SPCR table shows up if I boot with the device the output is
plugged into is powered down. I'm guessing this causes Tianocore to
advise GRUB/Linux/Xen to boot with a serial console (presenting a Serial
Port Console Redirect table), whereas if the display device is
functioning the absense of SPCR is supposed to indicate console on
framebuffer.
This means the ACPI_FAILURE case in acpi_iomem_deny_access() simply needs
to be filled in similar to how it likely is on x86. Allocate a serial
port for Xen's use as console, present it to domain 0 as hvc0, and hide
it from domain 0.
Next issue for me will be getting the framebuffer operational.
Apparently the Xen-ARM EFI implementation doesn't provide any EFI
variables to domain 0? Jan Beulich, your name was mentioned as person
likely to have ideas for getting Linux's efifb code operational Xen-ARM.
--
(\___(\___(\______ --=> 8-) EHM <=-- ______/)___/)___/)
\BS ( | ehem+sigmsg@m5p.com PGP 87145445 | ) /
\_CS\ | _____ -O #include <stddisclaimer.h> O- _____ | / _/
8A19\___\_|_/58D2 7E3D DDF4 7BA6 <-PGP-> 41D1 B375 37D0 8714\_|_/___/5445
next prev parent reply other threads:[~2020-10-16 22:34 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-26 20:55 [PATCH 0/4] xen/arm: Unbreak ACPI Julien Grall
2020-09-26 20:55 ` [PATCH 1/4] xen/acpi: Rework acpi_os_map_memory() and acpi_os_unmap_memory() Julien Grall
2020-09-28 8:18 ` Jan Beulich
2020-09-28 9:58 ` Julien Grall
2020-09-28 10:09 ` Jan Beulich
2020-09-28 10:39 ` Julien Grall
2020-10-10 9:49 ` Julien Grall
2020-10-10 10:04 ` Julien Grall
2020-09-29 11:10 ` Rahul Singh
2020-10-01 0:06 ` Stefano Stabellini
2020-10-01 15:09 ` Julien Grall
2020-09-26 20:55 ` [PATCH 2/4] xen/arm: acpi: The fixmap area should always be cleared during failure/unmap Julien Grall
2020-09-29 11:13 ` Rahul Singh
2020-10-01 0:30 ` Stefano Stabellini
2020-10-01 15:14 ` Julien Grall
2020-09-26 20:55 ` [PATCH 3/4] xen/arm: Check if the platform is not using ACPI before initializing Dom0less Julien Grall
2020-09-29 11:17 ` Rahul Singh
2020-09-30 23:26 ` Stefano Stabellini
2020-09-26 20:55 ` [PATCH 4/4] xen/arm: Introduce fw_unreserved_regions() and use it Julien Grall
2020-09-30 23:40 ` Stefano Stabellini
2020-10-01 15:34 ` Julien Grall
2020-09-27 1:47 ` [PATCH 0/4] xen/arm: Unbreak ACPI Elliott Mitchell
2020-09-29 15:28 ` Elliott Mitchell
2020-09-28 6:47 ` Masami Hiramatsu
2020-09-28 12:41 ` [PATCH] xen: acpi: Hide UART address only if SPCR exists Masami Hiramatsu
2020-09-28 12:42 ` Masami Hiramatsu
2021-01-19 7:25 ` Elliott Mitchell
2021-01-20 18:05 ` Julien Grall
2020-09-28 13:00 ` [PATCH 0/4] xen/arm: Unbreak ACPI Masami Hiramatsu
2020-10-16 22:33 ` Elliott Mitchell [this message]
2020-10-17 5:12 ` Xen-ARM EFI/ACPI problems (was: Re: [PATCH 0/4] xen/arm: Unbreak ACPI) Elliott Mitchell
2020-10-08 18:39 ` [PATCH 0/4] xen/arm: Unbreak ACPI Elliott Mitchell
2020-10-09 9:39 ` Julien Grall
2020-10-09 14:22 ` Elliott Mitchell
2020-10-09 18:15 ` Julien Grall
2020-10-09 22:36 ` Elliott Mitchell
2020-10-09 21:49 ` Elliott Mitchell
2020-10-10 11:02 ` Julien Grall
2020-10-12 19:02 ` Stefano Stabellini
2020-10-12 21:34 ` Elliott Mitchell
2020-10-14 1:06 ` Stefano Stabellini
2020-10-14 1:37 ` Elliott Mitchell
2020-10-14 17:47 ` Julien Grall
2020-10-15 18:00 ` Stefano Stabellini
2020-10-14 17:44 ` Julien Grall
2020-09-29 11:10 ` Rahul Singh
2020-09-29 15:29 ` Alex Bennée
2020-09-29 17:07 ` Julien Grall
2020-09-29 21:11 ` Alex Bennée
2020-09-29 23:39 ` André Przywara
2020-09-30 8:51 ` Alex Bennée
2020-09-30 10:35 ` Julien Grall
2020-09-30 9:42 ` Julien Grall
2020-09-30 10:38 ` Alex Bennée
2020-09-30 11:10 ` Julien Grall
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