Radxa rock-pi-3a

[Kever Yang]

Hi Richard,

     The ATAGs to pass the parameters is not available on the mainline 
U-Boot, and only use os_regs for the ram size for now, it do have the 
limitation for max 4GB now.

     There is a fix for this  on the list, you can try it:

https://patchwork.ozlabs.org/project/uboot/patch/20220222013131.3114990-12-pgwipeout@gmail.com/



Thanks,

- Kever

On 2022/4/8 15:44, Richard Kojedzinszky wrote:
> Dear community,
>
> I own a rock-pi-3a board with 8G ram. Right now, radxa's u-boot is 
> capable of detecting the whole amount during boot. Upstream u-boot 
> shows 1G of dram installed.
>
> I've started with evb-rk3568_defconfig.
>
> What I would like to achieve is that u-boot load grub-efi, to finally 
> boot the operating system. Howewer, with radxa uboot, and using 
> grub-efi, the kernel sees 4G only. If I boot the kernel image directly 
> from radxa u-boot, the whole 8G is visible. I assume that efi is 
> broken somehow, as I get multiple warnings from kernel regarding EFI 
> firmware.
>
>
> Reading radxa's u-boot, it seems that it uses ATAGs do detect memory 
> size. Am I in the right way?
>
> Would it be beneficial to port some of that code to upstream u-boot, 
> or are there other solutions to detect correct memory size?
>
>
> Thanks in advance,
> Richard