hamzeah

Hi, I have a question about maximum memory support on Allwinner processors, inc. A20 and A64. In datasheet I see: A20:"Support 2GB address space" A64:"up to 3GB address space" Does these mean the maximum installable memory on them? on the other hand, in official page, written that A64 has 1GB memory support! it is confusing. Thank you

it is solved. it has been discussed here that this is due to power source problem.

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 they stuck at the same place (line: DRAM: 1 GiB). BTW, in our PCB, we did not use "SD card detect" mechanical pin, so I already changed the U-boot CONFIG_MMC0_CD_PIN="PH1" to ="" before compile (otherwise it stuck in u-boot SPL and even did not go to u-boot). I treid to play with U-boot settings to have debugging message, but nothing changed. Can anyone give a clue? can the problem be a hardware issue? On internet I saw that I should see something like this, after DRAM line: ..... I2C: ready DRAM: 1 GiB MMC: SUNXI SD/MMC: 0 In: serial .... Thank you