Hi, I've been playing a bit with a pcduino3 board (A20), I know mainline u-boot has no R/W support on NAND for these boards and that's not what I'm asking for :-)

I've noticed that when I use an sdcard, u-boot+spl initializes the framebuffer and the screen goes on, whereas when I put u-boot.bin (without spl then) on the NAND the screen stays blank. Is there some magic done in the uboot's SPL that the defaut Allwinner's boot0/1 does not do ? The environment variables and uboot's output are identical in both boot processes:

U-Boot 2016.03-dirty (Jun 28 2016 - 10:59:14 +0200) Allwinner Technology [...] HDMI connected: Setting up a 1280x1024 hdmi console (overscan 0x0) In: serial Out: vga Err: vga [...]

The only difference is that the screen stays blank when uboot is read from the NAND by boot1. In this configuration booting linux (zImage+dtb read from a sdcard) afterwards does not bring the screen on either.

Any idea on what's going on ?

Thanks.