[U-Boot-Users] Runtime switch from uart0 to uart1?

[Travis Sawyer]

On Wed, 2004-09-15 at 04:21, Wolfgang Denk wrote:
> > However, I think this is going to add a little bit of text space even if
> > CONFIG_SERIAL_MULTI is not defined.
> 
> You know the reply: I don't like this idea ;-)
> 
> > There are several functions that will need to have this done, thus
> > adding 1 layer of indirection to the current code to allow for multiple
> > serial channels.
> 
> Maybe we can use function pointers instead which can  be  overloaded?
> [Just  be  careful  and  remember  that  function  pointers don't get
> relocated automagically.]
> 
Hmmm... Wouldn't this also increase the text and data space?

Regardless, I've gotten multiple serial to work on the ocotea board. 
I'll attempt to change the code so as to keep the non multi code the
same size.  However, for maintenance I think it will be more of a
problem than what I currently have.  I did an objdump of the original
object file, the new one both with and with out multi turned on:

Original:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000610  00000000  00000000  00000034  2**2
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  1 .data         00000000  00000000  00000000  00000644  2**0
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          00000000  00000000  00000000  00000644  2**0
                  ALLOC
  3 .debug_abbrev 000001e6  00000000  00000000  00000644  2**0
                  CONTENTS, READONLY, DEBUGGING
  4 .debug_info   00004c3e  00000000  00000000  0000082a  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  5 .debug_line   000005ce  00000000  00000000  00005468  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  6 .debug_frame  00000160  00000000  00000000  00005a38  2**2
                  CONTENTS, RELOC, READONLY, DEBUGGING
  7 .debug_pubnames 000000d2  00000000  00000000  00005b98  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  8 .debug_aranges 00000020  00000000  00000000  00005c6a  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  9 .debug_str    0000003d  00000000  00000000  00005c8a  2**0
                  CONTENTS, READONLY, DEBUGGING
 10 .comment      0000003d  00000000  00000000  00005cc7  2**0
                  CONTENTS, READONLY

NEW (MULTI OFF)
 Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000638  00000000  00000000  00000034  2**2
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  1 .data         00000000  00000000  00000000  0000066c  2**0
                  CONTENTS, ALLOC, LOAD, DATA
  2 .bss          00000000  00000000  00000000  0000066c  2**0
                  ALLOC
  3 .debug_abbrev 0000020a  00000000  00000000  0000066c  2**0
                  CONTENTS, READONLY, DEBUGGING
  4 .debug_info   00004cb2  00000000  00000000  00000876  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  5 .debug_line   00000689  00000000  00000000  00005528  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  6 .debug_frame  000001e8  00000000  00000000  00005bb4  2**2
                  CONTENTS, RELOC, READONLY, DEBUGGING
  7 .debug_pubnames 0000014c  00000000  00000000  00005d9c  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  8 .debug_aranges 00000020  00000000  00000000  00005ee8  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  9 .debug_str    0000003d  00000000  00000000  00005f08  2**0
                  CONTENTS, READONLY, DEBUGGING
 10 .comment      0000003d  00000000  00000000  00005f45  2**0
                  CONTENTS, READONLY


New (MULTI ON):
Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000768  00000000  00000000  00000034  2**2
                  CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
  1 .data         00000068  00000000  00000000  0000079c  2**2
                  CONTENTS, ALLOC, LOAD, RELOC, DATA
  2 .bss          00000000  00000000  00000000  00000804  2**0
                  ALLOC
  3 .debug_abbrev 00000236  00000000  00000000  00000804  2**0
                  CONTENTS, READONLY, DEBUGGING
  4 .debug_info   00004ec9  00000000  00000000  00000a3a  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  5 .debug_line   00000809  00000000  00000000  00005903  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  6 .debug_frame  00000274  00000000  00000000  0000610c  2**2
                  CONTENTS, RELOC, READONLY, DEBUGGING
  7 .debug_pubnames 000001e0  00000000  00000000  00006380  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  8 .debug_aranges 00000020  00000000  00000000  00006560  2**0
                  CONTENTS, RELOC, READONLY, DEBUGGING
  9 .debug_str    0000003d  00000000  00000000  00006580  2**0
                  CONTENTS, READONLY, DEBUGGING
 10 .comment      0000003d  00000000  00000000  000065bd  2**0
                  CONTENTS, READONLY

So, as you can see, the new source with MULTI OFF is a little larger.

If it is preferred to _*ABSOLUTELY*_ keep the size the same I'll try
some surgery.

Thanx

Travis