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([2a01:e0a:106d:1080:2f62:6d3:721b:8c9e]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a0280d924asm71505645e9.14.2026.10.02.02.22.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 02 Oct 2026 02:22:18 -0700 (PDT) Message-ID: <97e7014e-69a1-4ac8-8278-9e3795b05553@linaro.org> Date: Fri, 2 Oct 2026 11:22:16 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Subject: Re: [PATCH 2/2] arm64: dts: amlogic: meson-sm1-odroid-hc4: run the SPI NOR at 40 MHz To: iav@iav.lv, Kevin Hilman , Jerome Brunet , Martin Blumenstingl Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Christian Hewitt , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260930-hc4-spi-nor-v1-0-9a3351e2984e@iav.lv> <20260930-hc4-spi-nor-v1-2-9a3351e2984e@iav.lv> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20260930-hc4-spi-nor-v1-2-9a3351e2984e@iav.lv> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261002_022221_776224_B4633E1C X-CRM114-Status: GOOD ( 19.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Neil Armstrong Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/30/26 18:52, Igor Velkov via B4 Relay wrote: > From: Igor Velkov > > At 104 MHz, reads return corrupted data: bit 0 of the first byte of a > transfer flips from 0 to 1 part of the time. The same byte read as the > second byte of a transfer was correct in all 100 reads. One 4 KiB block > read 200 times came back wrong 157 times. Writes are unaffected. > > flashcp verifies while it writes, so a bootloader update erases blocks > it should skip and can abort halfway, with the flash half written. > > The Hardkernel vendor device tree for this board uses 40 MHz. At 40 MHz > the same tests pass: 200 block reads with no mismatch, and 14 flashcp > runs with no block erased. > > Tested on ODROID-HC4 with an XT25F128B. > > Fixes: 7178f340e929 ("arm64: dts: meson-sm1-odroid-hc4: add spifc node to ODROID-HC4") > Assisted-by: LLM > Signed-off-by: Igor Velkov > --- > arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts b/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts > index 5ce76a1bfe02..8f09f2b74bdd 100644 > --- a/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts > +++ b/arch/arm64/boot/dts/amlogic/meson-sm1-odroid-hc4.dts > @@ -144,7 +144,7 @@ flash@0 { > #size-cells = <1>; > compatible = "jedec,spi-nor"; > reg = <0>; > - spi-max-frequency = <104000000>; > + spi-max-frequency = <40000000>; > }; > }; > > Reviewed-by: Neil Armstrong Thanks, Neil