Re: Compiled in boot environment and dtbo files

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Hello Konstantin,

On 16.06.21 10:10, Konstantin Kletschke wrote:
> Dear community,
> 
> actually I wonder how to prepare a reset/boot up default boot environment compiled in.
> 
> Is it correct, that my 1st task to achieve this is to add a new file in defaultenv/defaultenv-2-base/boot
> like “insidem2m” for example? I managed to modify the existing “sd” entry to be able to boot
> and persist this, thats how my new entry should look:
> 
> #!/bin/sh
> 
> global.bootm.image=/boot/uImage
> global.bootm.oftree=/boot/am335x-boneblack.dtb
> global.linux.bootargs.dyn.root="cape_enable=capemgr.enable_partno=BB-UART1,BB-UART4 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait”
> 
> right?
> 
> 
> I can edit and modify those file and persist them, where is this saved? In my case it looks modified stuff shows
> up in barebox.env in my /boot.
> 
> Especially my question is, when I add a boot entry compiled in, the boot.default variable should get this entry
> and this must be reset/default compiled-in, how is this done?
> 
> My second issue is, currently I need to apply two dtbo files to the kernel booting, how do I do this in barebox?
> 
> In u-boot this looks like
> 
> uboot_overlay_addr0=/lib/firmware/BB-UART1-00A0.dtbo
> uboot_overlay_addr1=/lib/firmware/BB-UART4-00A0.dtbo
> 
> in uEnv.txt, I did not find a pendant in the barebox world yet.

You could add a bootspec file with

devicetree-overlay BB-UART1-00A0.dtbo BB-UART4-00A0.dtbo

If you want the overlay application to happen in the bootloader, but
decide the overlay selection policy in userspace.

> The capemgr/slot kernel commandline stuff is
> deprecated, right? 
> 
> 
> 
> 
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> 
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