[U-Boot-Users] Reg mcf54452 hanging when it runs in SDRAM

[Karthikeyan Kadirvel, Chennai]

hI,
 
    i am developing bootloader for mcf54452 board. i got a EVB for
mcf54455 as well as u-boot code.i just changed the u-boot code for
mcf54452. there are few difference only there between the boards.
 
 
 
In my board(MCF54452):
In  EVB board(MCF54455)
--------------------------------------
-------------------------------------      
 
FLASH:   INTEL flash1(16MB),INTEL flash2(16MB)=32MB
ATMEL flash1(16MB),INTEL flash2(16MB)=32MB

SDRAM:   64 MB single chip
chip0(64 MB)+chip1(64 MB)+chip2(64 MB)+chip3(64 MB)=256 MB 
Internal clock =200 MHZ
266 MHZ    
 
these are the diffrence only b/w them. 
 
 
when i am executing my code in my board(MCF54452);
 
1. Atter programming the u-boot code (372 KB) in FLASH,flash itself , it
is initializing some devices like serial ..etc. and then it u-boot code
is relocated to upper part of the SDRAM.
 
2.IN SDRAM . it will initialize the PCI,ETHERNET,I2C,SPI and...etc . 
 
3. then i will initialize the interrupts and timers.
 
4. then i will got to u-boot prompt where it gets the commnd from user.
 
 
My problem is:
 
till u-boot code is relocated to SDRAM is fine(Because i am getting msg
a msg that saysthat now running in RAM). after that my system(MCF54452)
is getting hanged. 
 
 
i checked :
 
1. Clock  - fine
2. SDRAM - i did read and write for 1 MB (more than u-boot size).
3. FLASH initialization - fine -because code is relocated to SDRAM
4. interrupts -all disabled.
5. Peripherals initialization  disabled (what are initialized in SDRAM)
 
when it relocated the u-boot code to SDRAM , the system is getting out
of control. But we can access the SDRAM by writing and reading.
 
i thougt problem in peripheral initialization, i am not getting prompt
even i disabled those things.
 
 
if anyone of get any idea reg this problem,just let me know.
 
Thanks &Regards,
Karthikeyan. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 


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