Hi Stefan,
Thanks.
Shall I need to add sleep() command in the interrupt_init or before it?
I am using Samsung M391B2873EH1-CH9 series 1 GB DDR3 and Denali controller
is being used for driving DDR3.
Regards,
Prakash
On Tue, May 4, 2010 at 8:04 PM, Stefan Roese <s...@denx.de> wrote:
> Hi Prakash,
>
> On Tuesday 04 May 2010 16:21:19 prakash bedge wrote:
> > I am facing an error while porting u-boot for my platform because if
> > exception error.
> >
> > After running the u-boot to detect the DDR and flash u-boot hangs after
> > showing the serial console output. In debugger I am seeing PC at
> 0x00000400
> > address which the exception handler vector address.
> >
> > But when I modify the below statement in the function int interrupt_init
> > (void) in u-boot\lib_ppc\interrupts.c, u-boot continues and I can see the
> > u-boot prompt and I am able to run all u-boot commands.
> >
> > int interrupt_init (void)
> > {
> > int ret;
> >
> > /* call cpu specific function from $(CPU)/interrupts.c */
> > ret = interrupt_init_cpu (&decrementer_count);
> >
> > if (ret)
> > return ret;
> >
> > set_dec (decrementer_count);
> >
> > --- set_msr (get_msr () | MSR_EE); //Removed this statement.
> > ++ set_msr (get_msr ());
>
> By not setting MSR_EE, you will not be able to receive external interrupts,
> or
> even worse, your timer will most likely not work. Try the "sleep" command.
>
> > return (0);
> > }
> >
> > It seems that there is an exception error and because of this u-boot
> hangs.
> > But I didn't get any error condition till now.
> >
> > If someone has earlier experienced this kind of issue, please share.
>
> One thing I've noticed in other PPC4xx ports as well, is that DDR auto-
> calibration (with short memory tests) can lead to exceptions that need to
> be
> cleared after the DDR is fully configured. Example:
>
> arch/powerpc/cpu/ppc4xx/44x_spd_ddr2.c:
>
> phys_size_t initdram(int board_type)
> {
> ...
>
> /*
> * Clear potential errors resulting from auto-calibration.
> * If not done, then we could get an interrupt later on when
> * exceptions are enabled.
> */
> set_mcsr(get_mcsr());
>
>
> Hard to tell, if you experience the same problem, since we have little
> information about your platform (which DDR3 core is used etc).
>
> Cheers,
> Stefan
>
> --
> DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: off...@denx.de
>
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