On Fri, 2016-05-27 at 09:13 -0400, Hendrik Boom wrote: > On Fri, May 27, 2016 at 10:59:35AM +0100, Steve McIntyre wrote: > > On Fri, May 27, 2016 at 10:41:39AM +0200, Francesco De Vita wrote: > > > Hi > > > > > > On 25/5/2016 16:31, Cyril Brulebois wrote: > > > > Francesco De Vita <fra...@inventati.org> (2016-05-24): > > > > > So, is it possible to access the efivarfs interface and retrieve > > > > > the required nvram-file inside the DI environment? > > > > > > > > I'm pretty sure we can do that from d-i since that's needed to get > > > > UEFI support working AFAICT. Looking at udebs, it seems you want to > > > > be loading this one, probably manually if you're at an early stage: > > > > efi-modules-4.5.0-2-amd64-di_4.5.4-1_amd64.udeb > > > > > > > > It contains: > > > > ./lib/modules/4.5.0-2-amd64/kernel/drivers/firmware/efi/efivars.ko > > > > > > > > which is likely to make it possible to access efivars, allowing you > > > > to mount them on the mount point (which you mentioned, exists > > > > already). > > > > > > This time I'm using the Stretch Alpha 6 DI. I successfully loaded the > > > efivars module as you suggested, however the efivarfs interface remains > > > inaccessible, it still cannot be mounted. > > > > > > I suppose that the efivarfs module has to be loaded too but there is no > > > trace of efivarfs.ko in the DI and I didn't find any udeb containing > > > it. Should I load it someway from an external source? > > > > Ah, that's your problem. It looks like we're not including that module > > yet. Most EFI variable users like efibootmgr will fall back to the > > older interfaces, so we've not noticed this yet. > > > > I'll go and fix that now. > > Wasn't mounting the efivars as a file system implicated in the complete > bricking of someone's hardware a while ago? The problem being that it > was too easy to rm those files, which deleted those efi variables, > which included variable that were essential to making booting possible? > Not just that it wouldn't boot the installed system any more; it could > no longer boot anything, not even an operating-system installer?
Fixed in Linux 4.5-rc5 and in 4.4.4. Now only variables on a known- safe whitelist are allowed to be deleted. [...] > Juat be very careful with efivars. We are. Ben. -- Ben Hutchings We get into the habit of living before acquiring the habit of thinking. - Albert Camus
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