[U-Boot] davinci: lowlevel_init for davinci boards

[Paulraj, Sandeep]

> 
> Hi,
> 
> I plan to use a davinci DM365 processor booting directly from a NOR
> flash, without using the UBL provided by Texas. So I do not want to set
> CONFIG_SKIP_LOWLEVEL_INIT in my config.
> 
> I am confused about the low level initialization for davinci SOC:
> arch/arm/cpu/arm926ejs/davinci/lowlevel_init.S sounds to be general for
> all DaVinci processors, but after a check I can see that it does not
> match at least for the DM365 (most offset are wrong). I have search for
> boards using this file, and it seems that only the sonata board could
> use it, if it does not boot from nand (it has a DM644).
> 
> Is the actual lowlevel_init.S really specialized only for the DM644 ? Do
> we need a specialized file for the other processors, too ? Or am I
> missing something ?

Yes the lowlevel_init.S is meant only for DM6446.

Later TI decided to do all the low level init in the UBL for both NAND and NOR boot modes. Thus the lowlevel_init.S actually became redundant w.r.t to our most recent releases, but for legacy reasons it continues to be present in U-Boot.


Sandeep