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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