> When DM_SERIAL is enabled, the device-tree property dm-pre-reloc is
> required to boot over UART with kwboot. Enable this in a Kirkwood
> common u-boot dtsi.
My (dev) board unfortunately, have a bootloader which can't boot over
serial.
This is feature of Marvell BootROM and does not require any special
from
Bootloader. So you should be able to boot over UART (if you have
accessible pins).
I know, but there are known versions ob the bootrom where uart boot
isn't supported (correctly). I also have another board which can boot
over uart. But thats in daily use ;)
Could you elaborate that a bit more? Why is this required for
uart boot? kwboot will talk with the bootrom why does u-boot need
anything? Or will there just be no output until the uart is
initialized?
On mvebu/armada boards this dm-pre-reloc is required to ensure that DT
nodes are present in SPL DTB file. Otherwise build process drop all
non-pre-realoc nodes from SPL version of DTB file. And because SPL use
DM serial, it is required to have uart DT nodes in DTB file. Btw, same
problem is with SPI in SPL.
But... kirkwood does not use SPL, so I do not know what is reason for
this here.
Yes thats what puzzled me, too.
>
> Signed-off-by: Tony Dinh <mibo...@gmail.com>
> ---
>
> arch/arm/dts/kirkwood-u-boot.dtsi | 7 +++++++
> 1 file changed, 7 insertions(+)
> create mode 100644 arch/arm/dts/kirkwood-u-boot.dtsi
Is this new? AFAIK only <boardname>-u-boot.dtsi is included
automatically.
It is not new, Tom wrote about it quite ago:
https://lore.kernel.org/u-boot/20220802121113.GG1146598@bill-the-cat/
Thats relatively new for someone not following the u-boot
development that closely ;) Thanks for the pointer.
-michael
