Re: [U-Boot-Users] start.S code snippet doubt

22 Nov 2004


      In message 1101131529.23c64d7cnishant.subs@myrealbox.com you wrote:
...
What does the following code achieve: (Code snippet from start.S)
Which start.S? There are at least 25 files with this name.
...
boot_cold:
#if defined(CONFIG_MPC8260ADS)
   lis	r3, CFG_DEFAULT_IMMR@h
   nop
   lwz	r4, 0(r3)
   nop
   rlwinm	r4, r4, 0, 8, 5
   nop
   oris	r4, r4, 0x0200
   nop
   stw	r4, 0(r3)
   nop
#endif /* CONFIG_MPC8260ADS */
Did  you  try  to  understand  what  the  code  is  doing?  And  what
CFG_DEFAULT_IMMR might mean?
...
Can anyone please tell me the importance/significance of this code?
The code is very important and significant - without it  U-Boot  will
not run on this board.
Best regards,
Wolfgang Denk
-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
A person who is more than casually interested in computers should  be
well  schooled in machine language, since it is a fundamental part of
a computer.                                           -- Donald Knuth