-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 12/10/2018 01:55 PM, Angel Pons wrote: > Hello, > > On Mon, Dec 10, 2018, 19:45 [email protected] <mailto:[email protected]> > <[email protected] <mailto:[email protected]> wrote: > > S3 - it does work but you just have to wait a long time I would guess > that maybe there is some ram re-training going on and that is why > resuming from S3 takes over a minute. > > > AFAIK, retraining the RAM destroys its contents (and that is why timings > must be cached to flash for S3 to work). Does AMD have anything special > to retrain memory yet still preserve RAM data to allow suspend, or am I > missing something here? > > Best regards, > > Angel Pons >
You are correct. The memory is not (and cannot be) retrained, the previous settings are loaded from the s3nv region of Flash (this is also why the settings change on each boot -- the last known good training data is loaded into Flash to support resume from suspend). My understanding is that because the current coreboot native AMD codebase doesn't support relocatable ramstage (yet?) we're hitting a slow path somewhere in resume. I think there was some work being put into adding the relocateable ramstage support but I don't know current status. - -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 (direct line) +1 (512) 690-0200 (switchboard) https://www.raptorengineering.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBCAAGBQJcDu1jAAoJEK+E3vEXDOFbGXUIAIPqreXXf253LywSE+rer+OT pPGwBDGGPAiVzlxZGISEvLTnit+fdL2vOEnRyit8HE0X3XesFxLUzm+QrCpYPT3O jn5GeiECF57jzKUbbbEWj1Zfs1DXJpxgoFOgJGR1+obcgMUTx++SGtahZPHIiYN8 YXqpHob+7noVtsr03dES4u5do2QVz0jDhvmATwotCdr+oBqasEWXBZfqUPXWWYCp CKfsMCTvjqQ1qyzD+TaA5ZCEwCGcnLRkkZbFM1NPRJI6oIdm9xMjdxobXWp0nuHR tdHkpptA4HQrx2/Qn3OI62JoRRaVJVqN0y+C+6PMGioXhGHxtpWsGeVMpkefWS8= =VP8L -----END PGP SIGNATURE----- -- coreboot mailing list: [email protected] https://mail.coreboot.org/mailman/listinfo/coreboot
