[U-Boot-Users] New x86 board booted...now the hard part

Marc Singer elf at buici.com
Tue May 27 19:36:33 CEST 2003

On Tue, May 27, 2003 at 08:34:14AM +0200, Wolfgang Denk wrote:
> I see. The usual problem.
> So far there are two approaches in U-Boot to solve this problem:
> 1) Some devices provide on-chip memory which  can  be  used  to  hold
>    initial  data  and  stack,  like the dual-ported RAM on MPC8xx and
>    some other processors; depending on your hardware there  might  be
>    other similar resources. Just a few kB are sufficient.

There is none.

> 2) If there is no such memory, you can probably lock some  parts  (or
>    all of) the cache and (mis-) use this as memory.

This may be possible, but it seems to me to be a lot of work just so
we can 'call' the routine that performs the SDRAM controller setup.

> > > Name it mem_init, and implement mem_init() in a source file whichgets
> > > compiled only for sc520 boards.
> > 
> > Presently, this mem_init function is part of the lib_i386 library.
> > Are you OK with IFDEF's in lib_i386/Makefile?  Or, would you rather
> > this be put into the BSP directory somehow?
> Please do not add board specific definitions to the Makefiles.

Then how about making this single function a configuration definition
and fixing the lib_i386 to use that constant.


#define MEM_INIT mem_init_sc520



> Fine. So I found another supporter to back me when I strive for small
> footprint.


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