Testing tonight. I will let the list know tomorrow. Thanks for this. Kg Sent from my currently functioning gadget
From: James Cameron <qu...@laptop.org>
Date: Fri, Feb 7, 2014 at 7:17 PM
Subject: Re: [support-gang] is rolling back firmware dangerous? (on XO-1s especially) To: "Community Support Volunteers -- who help respond to \"help AT laptop.org\"" <support-g...@lists.laptop.org> Cc: Adam Holt <h...@laptop.org>, support-g...@laptop.org On Fri, Feb 07, 2014 at 06:41:48PM -0500, Paul Fox wrote: sometimes a full power removal is necessary; main battery and adapter.> adam wrote: > > I used to do this all the time while testing XO-1s with different > > firmwares, but want to check if the _process_ of rolling back firmware on > > XO-1s is dangerous to the machine in general: > > > > 1) Are there risks to the _process_ of rolling back XO-1 firmware, EG from > > q2f19 to q2e48 (Release 11.3.0) as used by many in Kenya? > > no, there are no inherent risks in the process. > but i agree, within that range of versions there's no problem that i recall, and i do it still, much more often than you. > but why do you think it's necessary? be some legitimate concern rather than some vague fear, and so i want to hear about it and fix it. > > http://wiki.laptop.org/go/Firmware#XO-1 > > > > 2) Separate question: what risks might arise running Release 11.3.0 > > (required by many in Kenya) with more modern firmware like q2f19? > > we tried very hard to make sure that that scenario works correctly, > but of course not all combinations were (or could be) tested. [1] > > in addition, downgrading the firmware won't downgrade the EC code, so > the firmware will be running against a newer EC version that it wasn't > tested with. we tried very hard to make sure that all EC f/w versions > were compatible with old firmware and OS, but again, testing all > combinations would have been impossible. (note that i don't recommend > downgrading the EC to address this risk. the bug fixes added to later > EC releases are probably worth having.) host firmware, so it will downgrade the EC firmware if you downgrade the host firmware. what paul says in this paragraph above applies to XO-1.75 and XO-4 only. > summary: stick with the newest firmware unless you have good reason > not to. if there's any reason why 11.3.0 does not work with q2f19, then i want to know, and i will try to fix it. > paul > > [1] the converse, e.g. running 13.2.0 on q2e48 is not guaranteed to > work, and, in fact, may well break things. that's why new compatible > firmware comes with each new OS. -- James Cameron http://quozl.linux.org.au/ -- | ||
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