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  1. it is solved. it has been discussed here that this is due to power source problem.
  2. Hello, I have a design with old but cheap Allwinner A20 processor. At the boot time, u-boot keeps rebooting just after reaching the below line (just after DRAM: 1GiB): U-Boot SPL 2019.07 (Oct 13 2020 - 17:36:08 +0300) DRAM: 1024 MiB CPU: 912000000Hz, AXI/AHB/APB: 3/2/2 Trying to boot from MMC1 U-Boot 2019.07 (Oct 13 2020 - 17:36:08 +0300) Allwinner Technology CPU: Allwinner A20 (SUN7I) Model: Olimex A20-OLinuXino-LIME2-eMMC I2C: ready DRAM: 1 GiB I even tried ready images from internet, alghtough some did not reboot countinlusly, but the