[U-Boot] code looping in_ram in start.S

[smitha.vanga at wipro.com]

Hi ,

 

I am trying to bring up u-boot1.1.3 on a custom mpc8247 board, having
32MB flash and two 32 M SDRAM .

See a problem after the relocation happens. The code gets relocated from
Flash to RAM correctly. But when the control goes to in_ram it gets
looped there 

And then gets reset. I have done all the SDRAM tests all are successful.
So how to proceed for this issue

 

Below is the SDRAM initialization sequence.

 

 

; init SDRAM Init (PPC bus)

WM16  0xF0010184  0x1000            ;MPTPR

WM8   0xF001019C  0x18              ;PSRT 

 

WM32  0xF001010c  0xFC002d00 ;OR1 

WM32  0xF0010108  0x00001841 ;BR1  

 

WM32  0xF0010190  0xeb29a4a3   ;PSDMR: Precharge all banks

WM8   0x00000000  0x00          ;Access SDRAM

WM32  0xF0010190  0xcB29a4a3    ;PSDMR: CBR Refresh

WM8   0x00000000  0xFF          ;Access SDRAM

WM8   0x00000000  0xFF          ;Access SDRAM

WM8   0x00000000  0xFF          ;Access SDRAM

WM8   0x00000000  0xFF          ;Access SDRAM

WM8   0x00000000  0xFF          ;Access SDRAM

WM8   0x00000000  0xFF          ;Access SDRAM

WM8   0x00000000  0xFF          ;Access SDRAM

WM8   0x00000000  0xFF          ;Access SDRAM

WM32  0xF0010190  0xdb29a4a3    ;PSDMR: Mode Set

WM8   0x00000000  0x00          ;Access SDRAM

WM32  0xF0010190  0xc329a4a3    ;PSDMR: enable refresh, normal operation

 

Regards,

Smitha

 


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