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

[LABBE Corentin]

On Mon, Jan 27, 2020 at 12:06:16PM +0000, Andre Przywara wrote:
> 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

Just for more information, the official kernel from rpi also panic when booted with booti.
[    0.000000] Linux version 4.19.80 (oe-user at oe-host) (gcc version 8.2.0 (GCC)) #1 SMP PREEMPT Mon Jan 13 16:34:20 UTC 2020
[    0.000000] Machine model: Raspberry Pi 4 Model B
[    0.000000] earlycon: uart0 at MMIO32 0x00000000fe215040 (options '')
[    0.000000] bootconsole [uart0] enabled
[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: UEFI not found.
[    0.000000] cma: Failed to reserve 8 MiB
[    0.000000] Kernel panic - not syncing: ERROR: Failed to allocate 0x0000000000001000 bytes below 0x0000000000000000.

Regards