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
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