| Message ID | 20251220051013.3459855-2-sjg@u-boot.org |
|---|---|
| State | New |
| Headers |
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Fri, 19 Dec 2025 22:10:30 -0700 (MST) From: Simon Glass <sjg@u-boot.org> To: U-Boot Concept <concept@u-boot.org> Date: Fri, 19 Dec 2025 22:10:07 -0700 Message-ID: <20251220051013.3459855-2-sjg@u-boot.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251220051013.3459855-1-sjg@u-boot.org> References: <20251220051013.3459855-1-sjg@u-boot.org> MIME-Version: 1.0 Message-ID-Hash: UIFEXLZOOUIXEW7HZF2JSDMYKWTVQEA2 X-Message-ID-Hash: UIFEXLZOOUIXEW7HZF2JSDMYKWTVQEA2 X-MailFrom: sjg@u-boot.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Simon Glass <simon.glass@canonical.com>, "Claude Opus 4 . 5" <noreply@anthropic.com> X-Mailman-Version: 3.3.10 Precedence: list Subject: [Concept] [PATCH 1/4] arm: dts: rk3399-firefly: Reduce SD card speed for lab List-Id: Discussion and patches related to U-Boot Concept <concept.u-boot.org> Archived-At: <https://lists.u-boot.org/archives/list/concept@u-boot.org/message/UIFEXLZOOUIXEW7HZF2JSDMYKWTVQEA2/> List-Archive: <https://lists.u-boot.org/archives/list/concept@u-boot.org/> List-Help: <mailto:concept-request@u-boot.org?subject=help> List-Owner: <mailto:concept-owner@u-boot.org> List-Post: <mailto:concept@u-boot.org> List-Subscribe: <mailto:concept-join@u-boot.org> List-Unsubscribe: <mailto:concept-leave@u-boot.org> Content-Type: text/plain; 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| Series |
Lab fixes
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Commit Message
Simon Glass
Dec. 20, 2025, 5:10 a.m. UTC
From: Simon Glass <simon.glass@canonical.com> The Firefly-RK3399 board does not boot reliably in the SJG lab due to signal-integrity issues with SD-wire adapters at higher speeds. Reduce the SDMMC max-frequency to 25MHz and disable high-speed modes to improve compatibility. Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com> Signed-off-by: Simon Glass <simon.glass@canonical.com> --- arch/arm/dts/rk3399-firefly-u-boot.dtsi | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/arm/dts/rk3399-firefly-u-boot.dtsi b/arch/arm/dts/rk3399-firefly-u-boot.dtsi index 1f5fda1d0f1..ca7a6694bcb 100644 --- a/arch/arm/dts/rk3399-firefly-u-boot.dtsi +++ b/arch/arm/dts/rk3399-firefly-u-boot.dtsi @@ -6,6 +6,12 @@ #include "rk3399-u-boot.dtsi" #include "rk3399-sdram-ddr3-1600.dtsi" +&sdmmc { + max-frequency = <25000000>; /* 25MHz for SD-wire compatibility */ + /delete-property/ cap-sd-highspeed; + /delete-property/ cap-mmc-highspeed; +}; + &vdd_log { regulator-init-microvolt = <950000>; };