[PATCH] serial: zynqmp: Fetch baudrate from dtb and update

Michal Simek michal.simek at amd.com
Tue Mar 21 16:12:48 CET 2023

Hi Simon and Tom,

On 3/14/23 09:46, Venkatesh Yadav Abbarapu wrote:
> From: Algapally Santosh Sagar <santoshsagar.algapally at amd.com>
> The baudrate configured in .config is taken by default by serial. If
> change of baudrate is required then the .config needs to changed and
> u-boot recompilation is required or the u-boot environment needs to be
> updated.
> To avoid this, support is added to fetch the baudrate directly from the
> device tree file and update.
> The serial, prints the log with the configured baudrate in the dtb.
> The commit c4df0f6f315c ("arm: mvebu: Espressobin: Set default value for
> $fdtfile env variable") is taken as reference for changing the default
> environment variable.
> The default environment stores the default baudrate value, When default
> baudrate and dtb baudrate are not same glitches are seen on the serial.
> So, the environment also needs to be updated with the dtb baudrate to
> avoid the glitches on the serial.
> Signed-off-by: Algapally Santosh Sagar <santoshsagar.algapally at amd.com>
> Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu at amd.com>

I reviewed this patch internally and would like to get your opinion about it.
The problematic part is around ENV_RW_FILLER that's why I want to make sure that 
the patch is going in the right direction.


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