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[65.108.252.197]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b61670537esm1278228e87.66.2026.09.05.14.18.27 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 05 Sep 2026 14:18:28 -0700 (PDT) From: Danil Bezborodov To: u-boot@lists.u-boot-project.org Cc: Andre Przywara , Icenowy Zheng , Tom Rini , Danil Bezborodov Subject: [PATCH] sunxi: orangepi_zero: reduce DRAM clock to 408 MHz Date: Sun, 6 Sep 2026 00:17:57 +0300 Message-ID: <20260905211757.60253-1-xanmilanto@gmail.com> X-Mailer: git-send-email 2.54.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Sun, 06 Sep 2026 07:08:42 +0000 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 The Orange Pi Zero uses a single DDR3 chip on a 16-bit bus, unlike the Orange Pi PC family (two chips, 32-bit) whose values this defconfig inherited. The 624 MHz clock was never validated on this board: commit 8792a64d8770 ("sunxi: reduce Orange Pi Zero DRAM clock speed") lowered 672 to 624 based on lima-memtester results from an Orange Pi PC and the PC's value in the vendor U-Boot fork. The vendor BSP configuration for this exact board (orangepi-xunlong/external, sys_config_orangepi_zero.fex) sets dram_clk = 408, and Armbian has shipped a 624->408 patch for this board - and only this board among H3 Orange Pis - since 2017. On a 512 MB H3 variant of the board, 624 MHz produces reproducible memory corruption caught by the kernel's early_memtest; 408 MHz matches the vendor and Armbian values. Signed-off-by: Danil Bezborodov --- configs/orangepi_zero_defconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/configs/orangepi_zero_defconfig b/configs/orangepi_zero_defconfig index 49a1f4d0..09ce3a95 100644 --- a/configs/orangepi_zero_defconfig +++ b/configs/orangepi_zero_defconfig @@ -1,7 +1,7 @@ CONFIG_ARM=y CONFIG_ARCH_SUNXI=y CONFIG_DEFAULT_DEVICE_TREE="sun8i-h2-plus-orangepi-zero" -CONFIG_DRAM_CLK=624 +CONFIG_DRAM_CLK=408 CONFIG_SPL=y CONFIG_MACH_SUN8I_H3=y # CONFIG_VIDEO_DE2 is not set -- 2.50.1 (Apple Git-155)