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 <sm...@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 <sm...@web.de>
---
Cc: Stefano Babic <sba...@denx.de>
Cc: Fabio Estevam <feste...@gmail.com>
Cc: Tom Rini <tr...@konsulko.com>
Cc: Simon Glass <s...@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
