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[2.80.170.125]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47d7f653cd6sm163176345e9.9.2026.01.08.06.07.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jan 2026 06:07:58 -0800 (PST) Message-ID: <49bfb30f71eae0844676e6b545d67739b6d79539.camel@gmail.com> Subject: Re: [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt Trigger From: Vitor Soares To: "Markus Schneider-Pargmann (TI.com)" , Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alexander Sverdlin Cc: Vishal Mahaveer , Kevin Hilman , Dhruva Gole , Sebin Francis , Kendall Willis , Akashdeep Kaur , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 08 Jan 2026 14:07:57 +0000 In-Reply-To: <20260106-topic-am62a-mmc-pinctrl-v6-19-next-v1-1-1190ac29aadb@baylibre.com> References: <20260106-topic-am62a-mmc-pinctrl-v6-19-next-v1-1-1190ac29aadb@baylibre.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.44.4-0ubuntu2.1 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-01-06 at 17:22 +0100, Markus Schneider-Pargmann (TI.com) wrote= : > Remove Schmitt Trigger from mmc pins. With Schmitt Trigger enabled > u-boot SPL is not able to read u-boot from mmc: >=20 > =C2=A0=C2=A0=C2=A0 Trying to boot from MMC2 > =C2=A0=C2=A0=C2=A0 Error reading cluster > =C2=A0=C2=A0=C2=A0 spl_load_image_fat: error reading image u-boot.img, er= r - -22 > =C2=A0=C2=A0=C2=A0 Error: -22 > =C2=A0=C2=A0=C2=A0 SPL: Unsupported Boot Device! > =C2=A0=C2=A0=C2=A0 SPL: failed to boot from all boot devices > =C2=A0=C2=A0=C2=A0 ### ERROR ### Please RESET the board ### >=20 > I bisected this issue between u-boot v2025.10 and v2026.01 and found the > devicetree merge to be the problem. At a closer look I found the > k3-pinctrl.h changes. Disabling the Schmitt Trigger fixes the u-boot SPL > failure to read from mmc. >=20 > Fixes: 5b272127884b ("arm64: dts: ti: k3-pinctrl: Enable Schmitt Trigger = by > default") > Signed-off-by: Markus Schneider-Pargmann (TI.com) >=20 Hi Markus, We're seeing a similar issue on Verdin AM62 with U-Boot 2026.01. The board has complete SPL boot failure with no output at all. This occurs in the same version you bisected (v2026.01 failing). Could the Schmitt Trigger changes also affect Verdin AM62? Best regards, Vitor Soares