Hi all, I need to write to (and read from) a UART during board initialization that is not the same UART the U-Boot serial console is running on.
I'm using CONFIG_DM_SERIAL so I've extended my .dts to enable the additional UART (including pinmux registers). In my board init code I can find the serial driver instance of this additional interface via `uclass_get_device_by_name()` but now I'm stuck finding a way to actually do I/O with this device. All `serial_putc()`-like functions that I could find are either static to the actual driver and thus not accessible from `board_init()` or do not accept a `struct udevice *` as a parameter and seem to work on the main U-Boot serial console device only. I could of course copy the functionality of the implementing driver but that seems wrong to me, given we already have the concept of driver instances. Could somebody give me a quick hint as to how this is supposed to be done? The target is an i.MX8MM (thus serial_mxc), in case it matters. Thanks in advance! Best regards, Alex
