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Wed, 10 Sep 2025 14:06:34 +0000 Received: from VI0P195MB2484.EURP195.PROD.OUTLOOK.COM ([fe80::24f:8371:2871:5981]) by VI0P195MB2484.EURP195.PROD.OUTLOOK.COM ([fe80::24f:8371:2871:5981%4]) with mapi id 15.20.9094.021; Wed, 10 Sep 2025 14:06:33 +0000 Message-ID: <50c51eea-af1f-48ad-bb15-eeeeedbf9bf1@phytec.de> Date: Wed, 10 Sep 2025 16:06:24 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm: mach-k3: am625: Unlock MMR registers again To: "bb@ti.com" , "Sverdlin, Alexander" Cc: "upstream@lists.phytec.de" , "trini@konsulko.com" , "s-vadapalli@ti.com" , "u-boot@lists.denx.de" , "c-vankar@ti.com" , "kishon@ti.com" References: <20250815160240.3575140-1-d.schultz@phytec.de> <63e0078fbf5cb045b79a441dca0f2f71fd3962e5.camel@siemens.com> <20250910120815.ifbg5fndnaodopvt@bryanbrattlof.com> <64f1a6561417bf7ff9d8e92ea69e1ef842bd2055.camel@siemens.com> <20250910125335.orpc2lrm2amncbwg@bryanbrattlof.com> <20250910132609.bfqpdflcgfbtouq4@bryanbrattlof.com> Content-Language: en-US From: Daniel Schultz In-Reply-To: <20250910132609.bfqpdflcgfbtouq4@bryanbrattlof.com> Content-Type: text/plain; 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When booting HS-SE (security enforced) >>>>>>>> devices, the MMR registers are locked again and all write commands >>>>>>>> are simply ignored. >>>>>>>> >>>>>>>> Unlock the MMR registers again to successfully enable the MCU ESM >>>>>>>> source. >>>>>>> I'm just curious, could you please elaborate a bit, where the registers >>>>>>> are being locked again if they are being unlocked by ctrl_mmr_unlock() >>>>>>> in board_init_f() before enable_mcu_esm_reset()? >>>>>>> >>>>>>> Is it TIFS firmware? >>>>>>> What else could be affected? >>>>>>> Do we expect to leave General Purpose Control Registers unlocked >>>>>>> when we return from board_init_f()? >>>>>>> Does it mean that the whole ctrl_mmr_unlock() has to be re-done >>>>>>> after k3_sysfw_loader() call? >>>>>> I really can't tell why those registers are locked again. I figured out >>>>>> they're only locked again after loading the TIFS firmware on HS-SE devices. >>>>>> So, I also assume the firmware itself locks those registers again as part of >>>>>> a secure/security feature. >>>>> Hmm yeah this is likely a bug or a config issue. Ideally we >>>>> (U-Boot/Linux) should be in complete control of when these are locked or >>>>> unlocked. TIFS or DM shouldn't be anywhere near these MMRs. >>>>> >>>>>> The A53 SPL will unlock those registers again, which will be permanent. Only >>>>>> the watchdog is problematic because enable_mcu_esm_reset is currently only >>>>>> called in the R5 SPL (config only enabled in the R5 SPL defconfig). >>>>>> >>>>>> BTW: We have seen the same behavior with the AM68A/J721S2. >>>>> Hmm this is strange. >>>> Thanks for your assessment! >>>> Do you know who can be contacted at TI regarding this possible problem in >>>> TIFS firmware? Maybe this has to be fixed in TIFS firmware indeed? >>> I've started creating some noise internally to see if we can debug this >>> faster. Most of these teams are fairly insulated from the outside world >>> and can only be reached via e2e tickets. >> Thanks for looking into this! >> I read it as if we would not need to create an e2e ticket for now? > That's correct. I short circuited the e2e process by creating a bug and > messaging a few people internally to jump start the process: > > https://sir.ext.ti.com/jira/browse/EXT_EP-12916 Just for reference, I already opened an e2e post some weeks ago: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1511852/am625-am62x-hs-se-spl-cannot-write-to-mcu_mmr0_rst_ctrl/5813164#5813164 - Daniel > > ~Bryan