Re: [Suit] Introducing draft-moran-suit-manifest-04
Michael Richardson <mcr+ietf@sandelman.ca> Thu, 11 April 2019 17:17 UTC
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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: David Brown <david.brown@linaro.org>
cc: Brendan Moran <Brendan.Moran@arm.com>, "suit@ietf.org" <suit@ietf.org>
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Date: Thu, 11 Apr 2019 13:17:35 -0400
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Subject: Re: [Suit] Introducing draft-moran-suit-manifest-04
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David Brown <david.brown@linaro.org> wrote: >> Reboot resilience for “swap” is probably outside the scope of this draft. >> Adding a condition to check the success marker might be useful. > I'm not sure it really even makes sense to describe the reboot > resilience in the manifest. At least for swap, it is a large number > of steps that have to be done carefully, along with a lot of extra > state that is written every step. I would think this intermediate > state is beyond the scape of the manifest. > For those interested, I've thrown together a bit of an amination > describing how the swap operation works in MCUboot, including at least > part of its state. > https://www.youtube.com/watch?v=TvXjw2l0Cd0 > I'm not actually sure it is even going to make very much sense for > MCUboot to follow steps in the manifest, rather than just verifying > that they are present. The steps make sense for the download > application. Very nice animation. It really seems like the swap operation does by MCUboot ought to be below the level of the manifest instructions. > One difficulty I see following steps in the manifest is that the code > currently maintains state out-of-band from the manifest. The current > state is: That suggests to me that maybe we need to make the state explicit in the information model associated with the manifest. > Any thoughts on what is appropriate to even represent in the manifest? > The two instructions that the bootloader would follow would be "swap" > or "apply" (depending on configuration), and "run". Right now, we > distinguish swap vs copy by whether the new image contains the "image > ok" marker, but having two instructions could distinguish this as > well. -- ] Never tell me the odds! | ipv6 mesh networks [ ] Michael Richardson, Sandelman Software Works | IoT architect [ ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails [ -- Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works -= IPv6 IoT consulting =-
- [Suit] Introducing draft-moran-suit-manifest-04 Brendan Moran
- Re: [Suit] Introducing draft-moran-suit-manifest-… David Brown
- Re: [Suit] Introducing draft-moran-suit-manifest-… David Brown
- Re: [Suit] Introducing draft-moran-suit-manifest-… Martin Pagel
- Re: [Suit] Introducing draft-moran-suit-manifest-… David Brown
- Re: [Suit] Introducing draft-moran-suit-manifest-… Brendan Moran
- Re: [Suit] Introducing draft-moran-suit-manifest-… David Brown
- Re: [Suit] Introducing draft-moran-suit-manifest-… David Brown
- Re: [Suit] [EXTERNAL] Re: Introducing draft-moran… Cody Addison
- [Suit] FW: Introducing draft-moran-suit-manifest-… Rønningstad
- Re: [Suit] Introducing draft-moran-suit-manifest-… Waltermire, David A. (Fed)
- Re: [Suit] Introducing draft-moran-suit-manifest-… Michael Richardson
- Re: [Suit] Introducing draft-moran-suit-manifest-… Michael Richardson
- Re: [Suit] Introducing draft-moran-suit-manifest-… Kvamtrø
- Re: [Suit] Introducing draft-moran-suit-manifest-… Waltermire, David A. (Fed)
- Re: [Suit] Introducing draft-moran-suit-manifest-… Kvamtrø
- Re: [Suit] Introducing draft-moran-suit-manifest-… Waltermire, David A. (Fed)
- Re: [Suit] Introducing draft-moran-suit-manifest-… Kvamtrø
- Re: [Suit] Introducing draft-moran-suit-manifest-… Russ Housley
- Re: [Suit] Introducing draft-moran-suit-manifest-… Benjamin Kaduk
- Re: [Suit] Introducing draft-moran-suit-manifest-… David Brown
- Re: [Suit] Introducing draft-moran-suit-manifest-… Brendan Moran
- Re: [Suit] Introducing draft-moran-suit-manifest-… Brendan Moran
- Re: [Suit] Introducing draft-moran-suit-manifest-… Rønningstad