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a=rsa-sha256; c=simple/simple; d=docomonet.jp; s=20240125; t=1792214156; bh=ADevz4lTg88zlLGgtsqLNfkee88d26se6TI4xXgALMw=; h=From:To:Subject:Date:In-Reply-To:References:From; b=vPZCY4l0HFT6c49YR9hhxFTkgmIy04vCpJPkDdJx9kXDW8o4eziIsVzcvIJ6Y820k hGBi7AKFpt7DEwyRO9rdAf83s4QkwmG1+O/FYzLuniT5Hk8chJpQl6uQtjTdsyjaFo n5jp6fjhQvF/Ie42QcTOYbZxFBTBFLPbdrOC4ogQ= Received: from ocn-vc-mts-210c1.ocn.ad.jp ([210.145.250.232]) by ocn-spm-mts-201c1 with ngmta id 01b03369-18df3947801d6e2d; Sat, 17 Oct 2026 14:15:55 +0900 Received: from ocn-sdpx-mts-202c1.ocn.ad.jp ([210.145.249.135]) by ocn-vc-mts-210c1 with ngmta id 46fc158b-18df39473c7f4d88; Sat, 17 Oct 2026 14:15:54 +0900 Received: from docomonet.jp (p3688129-ipoe.ipoe.ocn.ne.jp [153.238.101.128]) by ocn-sdpx-mts-202c1.ocn.ad.jp (Postfix) with ESMTPA for ; Sat, 17 Oct 2026 14:15:54 +0900 (JST) From: "Asai, Shigeaki" To: u-boot@lists.u-boot-project.org Subject: Re: [PATCH 2/2] arm: dts: meson-g12b-odroid-go-ultra-u-boot: set vddio_c to 3.3V Date: Sat, 17 Oct 2026 14:15:54 +0900 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: HidemaruMail 7.42 (WinNT,A00) In-Reply-To: <69377c9e-b4a1-462a-b82d-66e13b465626@0leil.net> References: <20261010013237.2269021-1-y-asai.0816@docomonet.jp> <20261010013237.2269021-3-y-asai.0816@docomonet.jp> <69377c9e-b4a1-462a-b82d-66e13b465626@0leil.net> Message-Id: X-BeenThere: u-boot@lists.u-boot-project.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.u-boot-project.org (Resending to the list only; my first reply was rejected by the list server. Sorry for the duplicate.) Hi Quentin, Thank you for the review. On 10/16/26, Quentin Schulz wrote: > I'll let Neil decide since he's the maintainer of that code, but I don't > think this is necessarily correct? The spec specifically allows > 2.7-3.6V, c.f. https://www.sdcard.org/developers/sd-standard-overview/. > > Moreover, RK3399 Puma has 1.8-3.0V only, and it's been working fine for > years now (though I haven't checked with that SD card specifically). > > What happens if you do NOT use the SD in U-Boot at all and boot straight > to the Linux kernel, is it also broken in the Linux kernel then? If not, > then your issue is probably not what your tool output and we may have an > issue elsewhere (possibly in the MMC subsystem for example). Linux is fine with this card at 3.0V. Linux itself sets vddio_c to 3.0V, and the system runs from the same card (SD high speed, 50MHz) with no errors in dmesg. Following your comments, I tested again without this patch, and I can no longer reproduce the problem. I tried U-Boot 2025.07, 2026.07 and 2026.10, with and without patch 1/2, and three SD cards, including the one in the commit message. In about 35 reboots from Linux, U-Boot always read the card and booted the kernel. At the U-Boot prompt after a reboot, vddio_c was 3.0V and the SD card ran at 40MHz, so the conditions were the same as in my original report. I do not know what was different when I saw the failure. So I agree that 3.0V is probably not the cause, and I will drop this patch. If I can reproduce the problem again, I will look at it again, including the MMC side as you suggested. Neil, sorry for the noise. Best regards, Shigeaki Asai (This reply was written with the help of Claude.)