Hi All,
I am using a custom powerpc board with MPC8265 ( 66/200/300 Mhz) ,
32MB of SDRAM ( 0x00000000 - 0x01FFFFFF) and
8 MB of Flash Simm ( 0xFF800000 - 0xFFFFFFFF) .
I am modifying the MPC8260ads configurations to match my board but I don't see
any messages being printed on the serial port. I am using Codewarrior USB TAP
debugger to debug the u-boot code with an initialization file as follows:
setMMRBaseAddr 0x00000000
writemmr SCCR 0x0000
writemmr SYPCR 0xffffffc3
writemmr RMR 0x0001
# Memory periodic timer prescaler
writemmr MPTPR 0x3200
# Internal memory map register
writemmr IMMR 0x04700000
#Change the debugger's base address to match the new register base
setMMRBaseAddr 0x04700000
writemmr BR0 0xff801001
writemmr OR0 0xff800836
# CS2 is SDRAM, 64-bit port at 0x00000000
writemmr BR2 0x00000041
writemmr OR2 0xfe002ec0
# set 60x Bus assigned SDRAM Refresh Timer (PSRT)
writemmr PSRT 0x13
writemmr MPTPR 0x2800
# 60x SDRAM Mode Register
# precharge all banks
writemmr PSDMR 0x824b36a3
writemmr PSDMR 0xaa4b36a3
# perform an access
writemem.b 0x00000000 0x00
# cbr refresh
writemmr PSDMR 0x8a4b36a3
# perform 8 accesses
writemem.b 0x00000000 0xFF
writemem.b 0x00000000 0xFF
writemem.b 0x00000000 0xFF
writemem.b 0x00000000 0xFF
writemem.b 0x00000000 0xFF
writemem.b 0x00000000 0xFF
writemem.b 0x00000000 0xFF
writemem.b 0x00000000 0xFF
# 60x SDRAM Mode Register
# Issue Mode register write
writemmr PSDMR 0x9a4b36a3
writemem.b 0x00000190 0x00
writemmr PSDMR 0xc24b36a3
With the above initialization file when I define CONFIG_IMMR to 0xF0000000 in
u-boot it just doesn't go further and so I modified it to be same as the
initilization file ( 0x0470000) and now I am stepping little further into the
code but I am getting stuck at a point in cpu_init_f in start.S.
Could anyone please let me know the exact configurations I need to define in
mpc8260ads.h file in u-boot.
Any help is greatly appreciated.
Thanks in advance
Best Regards
Jyotshna
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