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[198.145.71.161]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b50316e195sm79377c88.8.2026.11.12.08.19.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2026 08:19:20 -0800 (PST) From: Hunter Laux To: "H. Nikolaus Schaller" Cc: Olivier Louvignes , Paul Cercueil , Paul Boddie , Thomas Bogendoerfer , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, Discussions about the Letux Kernel Subject: Re: [PATCH] MIPS: ingenic: Work around stale L2 data after DMA on XBurst II In-Reply-To: <988F3625-C300-4C68-AC70-E371E5D9A496@goldelico.com> References: <20261111-mips-ingenic-l2-war-v1-1-0d9dec232a7a@gmail.com> <988F3625-C300-4C68-AC70-E371E5D9A496@goldelico.com> Date: Thu, 12 Nov 2026 09:19:20 -0700 Message-ID: <179450036033.3574224.1997492818519568890@gmail.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Hi Nikolaus, On Thu, Nov 12, 2026 at 11:24 +0100, H. Nikolaus Schaller wrote: > - LX26 board with X2600 (isn't running stable for unknown reasons and > sometimes damages the µSD contents but your > patch didn't help to solve) I don't know that the stale L2 data is behind your instability or µSD problem. A quick way to rule it in or out, independent of the patch, is to turn the prefetcher off (MSCR.DisPFB2): devmem 0x12200060 32 $(( $(devmem 0x12200060) | 2 )) With it off I saw no stale reads here. > Maybe the individuals and teams working on the XBurst devices should > coordinate somehow to avoid double work and potentially incompatible > fragments? Agreed. I'll follow up off-list with what I have for the X2600. What I have working on my board is here, on top of v7.3.3: https://github.com/jolting/linux/tree/ad5x-7.3.3-rc1 The patches I send upstream are cherry-picked from it. I don't have any dev boards. My X2600 is in a Flashforge Adventurer 5X 3D printer, which is quite cheap, and its mainboard is also sold on its own as a replacement part. A few of the printers make an X2600 test lab that doubles as a print farm. Hunter