From: Tony Lindgren <tony@atomide.com>
To: "Pali Rohár" <pali.rohar@gmail.com>
Cc: "Frank Rowand" <frowand.list@gmail.com>,
"Arnd Bergmann" <arnd@arndb.de>, "Pavel Machek" <pavel@ucw.cz>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"Russell King - ARM Linux" <linux@arm.linux.org.uk>,
"Laura Abbott" <lauraa@codeaurora.org>,
"Grant Likely" <grant.likely@linaro.org>,
"Rob Herring" <robherring2@gmail.com>,
"Will Deacon" <will.deacon@arm.com>,
"Ivaylo Dimitrov" <ivo.g.dimitrov.75@gmail.com>,
"Sebastian Reichel" <sre@debian.org>,
"Andreas Färber" <afaerber@suse.de>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry
Date: Fri, 27 Nov 2015 06:51:32 -0800 [thread overview]
Message-ID: <20151127145131.GX2517@atomide.com> (raw)
In-Reply-To: <20151127083833.GA430@pali>
* Pali Rohár <pali.rohar@gmail.com> [151127 00:39]:
> On Thursday 26 November 2015 12:39:30 Tony Lindgren wrote:
> > Just to explore options.. How about make a minimal device driver that
> > just loads the atags blob from /lib/firmware and then shows it in
> > /proc/atags? Of course some checking on the atags should be done by
> > the driver..
>
> And who can dynamically create that blob file in /lib/firmware? If
> kernel does not export those atags (somehow) from bootloader, then
> userspace is not able to create that blob... cyclic problem.
>
> So no, problem is that bootloader provides via custom atags dynamic
> information like: boot reason (how was device started, by rtc alarm? by
> reboot? by usb charger? by power button?), boot mode (should be enter
> into firmware update mode?, is this normal boot mode?), ... and those
> information are needed for some proprietary software (e.g. firmware
> upgrade/flash) but also by any other open source applications (based on
> usb charger we enter different runlevel -- for just only charging
> device).
OK if the ATAGs are not static then naturally we can't create the blobs
then.
Regards,
Tony
next prev parent reply other threads:[~2015-11-27 14:51 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1436214373-12969-1-git-send-email-pali.rohar@gmail.com>
[not found] ` <20150713131902.GH26485@atomide.com>
[not found] ` <20151012201640.GQ23801@atomide.com>
[not found] ` <201510122225.12786@pali>
[not found] ` <20151012204509.GT23801@atomide.com>
[not found] ` <20151013143746.GJ23104@pali>
[not found] ` <20151105114041.GC27908@pali>
[not found] ` <20151105161756.GG3078@atomide.com>
2015-11-12 1:10 ` [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry Frank Rowand
2015-11-22 6:51 ` Pavel Machek
2015-11-23 14:45 ` Pali Rohár
2015-11-25 18:16 ` Tony Lindgren
2015-11-25 19:48 ` Arnd Bergmann
2015-11-25 21:03 ` Tony Lindgren
2015-11-25 21:29 ` Arnd Bergmann
2015-11-25 21:44 ` Pali Rohár
2015-11-25 21:51 ` Arnd Bergmann
2015-11-25 22:00 ` Pali Rohár
2015-11-26 4:19 ` Frank Rowand
2015-11-26 9:07 ` Pali Rohár
2015-11-26 20:39 ` Tony Lindgren
2015-11-26 21:12 ` Ivaylo Dimitrov
2015-11-27 8:38 ` Pali Rohár
2015-11-27 8:44 ` Michael Trimarchi
2015-11-27 8:52 ` Michael Trimarchi
2015-11-27 14:51 ` Tony Lindgren [this message]
2015-11-27 13:27 ` Russell King - ARM Linux
[not found] ` <20151127132722.GA30871-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2015-11-27 19:51 ` Russell King - ARM Linux
2015-11-27 21:06 ` Arnd Bergmann
2015-11-27 23:28 ` Nicolas Pitre
[not found] ` <alpine.LFD.2.20.1511271817230.22569-fMhRO7WWcppj+hNMo8g0rg@public.gmane.org>
2015-11-28 12:27 ` Arnd Bergmann
2015-11-28 12:54 ` Russell King - ARM Linux
2015-11-28 12:33 ` Russell King - ARM Linux
2015-11-28 17:34 ` Nicolas Pitre
[not found] ` <alpine.LFD.2.20.1511281232440.22569-fMhRO7WWcppj+hNMo8g0rg@public.gmane.org>
2015-11-28 21:02 ` Frank Rowand
2015-11-29 18:09 ` Russell King - ARM Linux
2015-11-29 18:19 ` Pali Rohár
2015-11-29 23:13 ` Russell King - ARM Linux
2015-11-30 0:09 ` Nicolas Pitre
[not found] ` <alpine.LFD.2.20.1511291902100.22569-fMhRO7WWcppj+hNMo8g0rg@public.gmane.org>
2015-11-30 0:15 ` Pali Rohár
2015-11-30 15:23 ` Tony Lindgren
[not found] ` <20151130152352.GY2517-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2015-11-30 15:39 ` Pali Rohár
2015-11-30 16:09 ` Nicolas Pitre
2015-12-15 9:33 ` Pali Rohár
2015-12-15 11:04 ` Arnd Bergmann
2015-12-15 12:20 ` Russell King - ARM Linux
[not found] ` <20151215122038.GI30871-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2015-12-15 17:24 ` Nicolas Pitre
2015-12-23 14:54 ` Ivaylo Dimitrov
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