Messages in this thread | | | Date | Fri, 27 Nov 2015 06:51:32 -0800 | From | Tony Lindgren <> | Subject | Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry |
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* 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
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