On Fri, Sep 27, 2019 at 11:59:50AM +0200, Bastian Krause wrote: > By default systemd generates a machine id on first boot and tries to > persist it (see `man machine-id`). When the root file system is read-only > systemd cannot persist the machine id. In case multiple redundant slots > are used the machine id will vary. When not handled explicitly the > machine id will also change during system updates. > > It is possible to pass a machine id to the kernel which will be used by > systemd (systemd.machine_id=). > > This series adds a way to provide device-specific hashable information > to generate a unique, persistent id. The i.MX unique id from the OCOTP > registers is added as hashable exemplarily. The id is available as > global.machine_id in barebox. It can be overwritten with nv.machine_id > if necessary. > The machine id is passed on to the Kernel by bootm based on > global.bootm.provide_machine_id. > > Changes since v3: > - nvmem: ocotp: use existing OCOTP_UNIQUE_ID instead of introducing a > new define > - convert imx_ocotp_set_unique_machine_id() to void as it's return > is not used, simplify it > > Changes since v2: > - set id to global.machine_id in init call instead of preparing the > bootarg already (so it's usable within barebox, too) > - move global.linux.bootargs.machine_id preparations to bootm code > - make global.linux.bootargs.machine_id preparations conditionally, > based on bootm.provide_machine_id > - free machine id char pointer after globalvar_add_simple() > - make global.machine_id a magicvar > - make global.bootm.provide_machine_id a magicvar > > Changes since (implicit) v1: > - depend on SHA1 instead of selecting DIGEST/DIGEST_SHA1_GENERIC > - add note about multiple sources providing hashables to kconfig > - add note about no hashable provided to kconfig > - remove warning about "no hashable info provided" along with pr_fmt > - make machine_id_set_hashable()'s hashable parameter const > - make a copy of the hashable provided rather than storing the pointer > - hash data instead of pointer address > - use basprintf() and dedicated variables for hex machine id/machine id > bootarg > - add static inline wrapper if CONFIG_MACHINE_ID is disabled > - nvmem: ocotp: remove explicit address-of operator for unique_id_parts > > Regards, > Bastian > > Bastian Krause (3): > common: machine_id: introduce machine id generation > nvmem: ocotp: set unique id as machine-id hashable > bootm: allow providing machine id to Kernel Applied, thanks Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
