[U-Boot-Users] Serial init of both SMC and SCC

[Björn Östby]

>In message <004B1D7A5257174C9044A1B7BD0E60ED0178CC5C at ratatosk.combitechsystems.com> you >>>wrote:
> >
>> I'm trying to get three serial ports up and running simultaneously. 
>> I'm using slightly modified TQM823L based board (added FPGA) with 
>> serials on SMC1, SMC2 and SCC3. The problem is to get SCC3 alive into 
>> Linux. A detailed study of the problem follows shows that when using 
>> SCC3 for console in u-boot, it also works in Linux, but when using 
>> SMC1 (or SMC2) for console, SCC3 does not work in Linux. So I have 
>> come to my own humble conclusion that it has something to do with the 
>> initialization of the serial devices in u-boot. Long story short:
>
>No,  you  are  wrong.  Linux  drivers  must   never   rely   on   any
>initialization done by any boot loader.
>
>> I _really_ want the console on SMC1 and I need the SCC3 serial working 
>> on the side. Are there any appropriate ways of achieving this (I've 
>> tried enabling both SMC1 and SCC3 for console but that did not do the 
>> trick)?
>
>Fix your Linux driver / port. This is not an U-Boot issue.
>
>Best regards,
>
>Wolfgang Denk

Thanks for this simple clarification. After moving the custom u-boot init code to Linux, everything works like a charm!

Cheers.
Bjorn Ostby