[U-Boot] U-Boot Crashes with Dumps

[Stefan Roese]

On Wednesday 13 January 2010 18:43:31 anupbehare at gmail.com wrote:
> I am using board having ppc440x5 core with customized chip and not a
> standard 440Gx.
> 
> Board is using Denali controller, as the register are completely different
> we can not use the standard u-boot initialization.

OK, I see. So you have a customized non-440EPx/GRx chip with the Denali DDR(2) 
controller. You are aware that we have a full blown Denali DDR(2) controller 
setup routine with SPD detection? This one is only for 440EPx/GRx right now, 
since these were the only PPC4xx variants equipped with this core till now:

cpu/ppc4xx/denali_spd_ddr2.c
cpu/ppc4xx/denali_data_eye.c

You should try to use this code as it is known to work on other PPC4xx 
platforms in various configurations.

> We performed board specific initialization and training for DDR2.
> 
> When the code enter into board_init_r() console shows following messages:
> 
> Top of RAM usable for U-Boot at: 20000000
> Reserving 178k for U-Boot at: 1ffd3000
> Reserving 1040k for malloc() at: 1fecf000
> Reserving 128 Bytes for Board Info at: 1fecef80
> Reserving 64 Bytes for Global Data at: 1fecef40
> New Stack Pointer is: 1fecef28
> 
> Now running in RAM - U-Boot at: 1ffd3000
> Bus Fault @ 0x1ffd5764, fixup 0x00000000
> Machine Check Exception.
> 
> NIP: 1FFD5764 XER: 00000000 LR: 1FFD5764 REGS: 1fecee20 TRAP: 0200 DEAR:
> 00000000
> MSR: 00021000 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 00
> 
> GPR00: 1FFD5338 1FECEF10 1FECEF40 1FFD3000 1FFD6814 00000034 00000034
> 1FFD5764
> GPR08: 00000600 00002098 00000030 2FAF07FE FFFFFFFF C000B330 20002A00
> 20013000
> GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 00000000
> GPR24: 00000000 1FECEF40 1FFD3000 1FED3000 1FFD3000 1FECEF80 20002B10
> 20013000
> Call backtrace:
> 1FFD680C 1FFD56D8 A462C4EC
> machine check
> 
> 
> We tried to debug it with BDI as per steps given @
> http://www.denx.de/wiki/view/DULG/DebuggingUBoot#Section_10.1.2.
> 
> We have verified by using BDI that uboot code is placed in DDR, but getting
> an exception and u-boot is in continuously reboot mode.

Did you try adding some printf's to board_init_r(), to see where exactly this 
crash occurs? That's what I would do.
 
> Will it ok if we disable the MSR for ME,EE,CE? Or still it looks DDR
> initialization issue ?

Could be DDR, could be something else. You need to further debug this.

Cheers,
Stefan

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