On 14.03.22 19:28, Tom Rini wrote:
On Mon, Mar 14, 2022 at 12:24:36PM -0600, Simon Glass wrote:
Hi Soeren,
On Mon, 14 Mar 2022 at 02:26, Soeren Moch smoch@web.de wrote:
... to get rid of the build warning. Unfortunately we still need the board specific serial pin init code. Otherwise the first boot messages over the serial console are lost.
Signed-off-by: Soeren Moch smoch@web.de
Cc: Stefano Babic sbabic@denx.de Cc: Fabio Estevam festevam@gmail.com Cc: Tom Rini trini@konsulko.com Cc: Simon Glass sjg@chromium.org Cc: u-boot@lists.denx.de
The whole purpose of DM is somewhat defeated when we still need board specific initializations. Any ideas how we can get all boot messages without board specific inits? 'u-boot,dm-pre-reloc;' in the uart device tree node did not help.
You can put that in your serial driver, perhaps? Or in the initial SoC init code?
Why should I do so? The whole point of DM is initializing devices from DT. And when I wish to do so pre-relocation, it is advertised in DM to add 'u-boot,dm-pre-reloc;' for this purpose. I tried, it did not work. And this is nothing closely related to the serial driver itself, I just want the pin setup running pre-relocation and not as late as it is running now under DM_SERIAL.
I also do not want to run this pin setup twice (first in board or SoC code and again by DM_SERIAL later). Maybe I miss something obvious, but duplication of the setup code cannot be a proper solution.
Another recent way (in -next) is to use events to monitor the EVT_DM_PRE_PROBE event for the serial driver.
I can monitor the probe event, OK. But how can this solve my problem? Again, maybe I miss something obvious, please tell me when I do so.
It's just the same thing every single imx platform is doing.
Sorry, I don't understand what you mean here. The reference platform for my board is mx6sabresd. This is not converted to DM_SERIAL yet. Most (?) imx boards use SPL, pin setup is different there. I looked into imx boards with DM_SERIAL. They either removed the board-specific setup code (which results in missing early boot messages: u-boot version, board name, DDR size, ...) or they are playing tricks in SPL (not the clean and easy solution that DM promises). Maybe I missed a better reference for the DM_SERIAL conversion without SPL. Can you point me to such board?
Thanks, Soeren