Using `fel-boot-lima-memtester-on-orange-pi-pc 672` on an Orange Pi without heatsink results in the following error after a few minutes: WRITE FAILURE: 0x00200000 != 0xffdfffff at offset 0x0137f47c (bitflip).
Also, the constructor repository (github/orangepi-xunlong) seems to contain that 624 Mhz clock speed in its u-boot fork. It may be that 672 Mhz is the advertized overclocked speed.
According to http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit it may be worth decreasing that value with other Orange Pi boards.
See also e7d6aa0b74b7f4d08ee68da8a586c76c761348e2. --- 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 c650ce87d9..16a3929aa5 100644 --- a/configs/orangepi_zero_defconfig +++ b/configs/orangepi_zero_defconfig @@ -2,7 +2,7 @@ CONFIG_ARM=y CONFIG_ARCH_SUNXI=y CONFIG_SPL_SPI_FLASH_SUPPORT=y CONFIG_MACH_SUN8I_H3=y -CONFIG_DRAM_CLK=672 +CONFIG_DRAM_CLK=624 CONFIG_DRAM_ZQ=3881979 CONFIG_DRAM_ODT_EN=y # CONFIG_VIDEO_DE2 is not set