linux-kernel - Re: [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt Trigger

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <49bfb30f71eae0844676e6b545d67739b6d79539.camel@gmail.com>
Date: Thu, 08 Jan 2026 14:07:57 +0000
From: Vitor Soares <ivitro@...il.com>
To: "Markus Schneider-Pargmann (TI.com)" <msp@...libre.com>, Nishanth Menon
 <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, Tero Kristo
 <kristo@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Alexander
 Sverdlin <alexander.sverdlin@...il.com>
Cc: Vishal Mahaveer <vishalm@...com>, Kevin Hilman <khilman@...libre.com>, 
 Dhruva Gole <d-gole@...com>, Sebin Francis <sebin.francis@...com>, Kendall
 Willis <k-willis@...com>,  Akashdeep Kaur <a-kaur@...com>,
 linux-arm-kernel@...ts.infradead.org,  devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: ti: k3-am62a7-sk: Disable mmc Schmitt
 Trigger

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:
> 
>     Trying to boot from MMC2
>     Error reading cluster
>     spl_load_image_fat: error reading image u-boot.img, err - -22
>     Error: -22
>     SPL: Unsupported Boot Device!
>     SPL: failed to boot from all boot devices
>     ### ERROR ### Please RESET the board ###
> 
> 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.
> 
> Fixes: 5b272127884b ("arm64: dts: ti: k3-pinctrl: Enable Schmitt Trigger by
> default")
> Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@...libre.com>
> 
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