Re: UEFI bootloader: command ?

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Wed, Jul 31, 2019 at 09:06:41PM -0700, Jason Thorpe wrote:
> 
> 
> > On Jul 31, 2019, at 10:51 AM, Jason Thorpe <thorpej%me.com@localhost> wrote:
> > 
> >> On Jul 31, 2019, at 9:10 AM, Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote:
> >> 
> >> Hello,
> >> I have some questions about the UEFI boot loader and customisation
> >> (I'm working with A20-based boards), and didn't find documentation about
> >> it.
> >> First, I have custom devices trees. How are device tree loaded in UEFI world,
> >> and how can I set the file name to be loaded ?
> > 
> > I added support for this by reading a configuration file (/etc/efiboot.plist), but I haven't written documentation yet.  I have started a boot(8) man page for evbarm, but haven't found the motivation to finish it.  When I am back home tonight, I'll follow-up with an example.
> 
> OK!  On my Orange Pi Zero Plus, I have an /etc/efiboot.plist that contains:
> 
> <plist>
> <dict>
>         <key>device-tree-overlays</key>
>         <array>
>                 <string>/stand/evbarm/dtb/sunxi-h3-h5-orangepi-zero-nas.dtbo</string>
>         </array>
> </dict>
> </plist>
> 
> 
> That is a path in the root (FFS) file system.
> 
> Jared and I have discussed changing it to look for the overlays in the FAT (/boot) file system, but for how this is how it is implemented.
> 
> You need efiboot v1.9:
> 
> 1.9:	Add support for efiboot.plist and loading device tree overlays.
> 
> LMK if you have any questions!

thanks. Where is the initial dtb loaded from ?
Also is there a way to change the default boot command (like, tftp-load
the kernel, or add parameters like console= ) ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--