[PATCH v3 0/3] Ethernet support for Raspberry Pi 4

[Andre Przywara]

On Mon, 27 Jan 2020 12:50:16 +0100
LABBE Corentin <clabbe at baylibre.com> wrote:

Hi,

> On Mon, Jan 27, 2020 at 04:27:03PM +0530, Amit Tomer wrote:
> > Hi,
> >   
> > > The kernel panic just after with "OF: reserved mem: failed to allocate memory for node 'linux,cma'" but that's another story.  
> > 
> > But this comes even without having Ethernet patches and when one use
> > booti instead of bootefi, right ?
> >   
> 
> So booti is unsupported on rpi 4 ?

It should be supported, but apparently there is some bug. I guess it's about not properly reserving memory used by the armstub/ATF. Do you use the embedded RPi foundation armstub or ATF (do you have an "armstub=..." line in config.txt)?

I will try take a look at this later.

> I need to set a ramdisk and bootefi dont support that.

Try "initrd=<filename>" on the kernel command line.
This is actually an EFI stub feature, the EFI command line is parsed by this pre-kernel code, which filters for initrd= and loads the initrd using the UEFI API (implemented by U-Boot).
So the initrd has to live on the EFI system partition, which means you can't load it easily via TFTP :-(
More details here: https://www.kernel.org/doc/html/latest/admin-guide/efi-stub.html#the-initrd-option

Cheers,
Andre