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Mon, 12 Jan 2026 03:05:10 +0000 Received: from DB9P195MB1444.EURP195.PROD.OUTLOOK.COM ([fe80::a4ad:a30e:789a:db7b]) by DB9P195MB1444.EURP195.PROD.OUTLOOK.COM ([fe80::a4ad:a30e:789a:db7b%4]) with mapi id 15.20.9499.002; Mon, 12 Jan 2026 03:05:10 +0000 Message-ID: <5e333477-1745-4db8-a56a-abfdad8ef825@phytec.de> Date: Mon, 12 Jan 2026 10:04:18 +0700 User-Agent: Mozilla Thunderbird Subject: Re: [Upstream] Re: [PATCH] arm: mach-k3: am625: Unlock MMR registers again To: Daniel Schultz , "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> <50c51eea-af1f-48ad-bb15-eeeeedbf9bf1@phytec.de> Content-Language: en-US From: Wadim Egorov In-Reply-To: <50c51eea-af1f-48ad-bb15-eeeeedbf9bf1@phytec.de> 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 I would like to know if we can proceed with Daniels patch. The reply in the E2E post suggests more or less the same change. > > - Daniel > >> >> ~Bryan > _______________________________________________ > upstream mailing list -- upstream@lists.phytec.de > To unsubscribe send an email to upstream-leave@lists.phytec.de