From: Igor Velkov via B4 Relay <devnull+iav.iav.lv@kernel.org>
To: Neil Armstrong <neil.armstrong@linaro.org>,
Kevin Hilman <khilman@baylibre.com>,
Jerome Brunet <jbrunet@baylibre.com>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Rob Herring <robh@kernel.org>, Conor Dooley <conor+dt@kernel.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Igor Velkov <iav@iav.lv>,
linux-amlogic@lists.infradead.org,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] arm64: dts: amlogic: meson-sm1-odroid-hc4: run the SPI NOR at 40 MHz
Date: Wed, 30 Sep 2026 16:52:15 +0000 [thread overview]
Message-ID: <20260930-hc4-spi-nor-v1-2-9a3351e2984e@iav.lv> (raw)
In-Reply-To: <20260930-hc4-spi-nor-v1-0-9a3351e2984e@iav.lv>
From: Igor Velkov <iav@iav.lv>
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 <iav@iav.lv>
---
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>;
};
};
--
2.43.0
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next prev parent reply other threads:[~2026-09-30 16:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-30 16:52 [PATCH 0/2] arm64: dts: amlogic: meson-sm1-odroid-hc4: fix the SPI NOR Igor Velkov via B4 Relay
2026-09-30 16:52 ` [PATCH 1/2] arm64: dts: amlogic: meson-sm1-odroid-hc4: mux the SPI NOR HOLD# and WP# pins Igor Velkov via B4 Relay
2026-10-02 9:23 ` Neil Armstrong
2026-09-30 16:52 ` Igor Velkov via B4 Relay [this message]
2026-10-02 9:22 ` [PATCH 2/2] arm64: dts: amlogic: meson-sm1-odroid-hc4: run the SPI NOR at 40 MHz Neil Armstrong
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