[U-Boot] [PATCH 3/7] 83xx/85xx/86xx: Add ECC support

[Peter Tyser <ptyser@xes-inc.com>]

On Tue, 2009-11-10 at 08:25 +0800, Liu Dave-R63238 wrote:
> How to use these command to test the ECC?
> Specially, how to inject multi error in 64bit data bus?

<snip>

> > +U_BOOT_CMD(ecc, 5, 0, do_ecc,
> > +	"support for DDR ECC features",
> > +	"info - print ECC information\n"
> > +#if (CONFIG_NUM_DDR_CONTROLLERS > 1)
> > +	"ecc ctrl [num]\n"
> > +	"\t-Set active controller to 'num', or display active 
> > controller\n"
> > +#endif
> > +	"ecc inject high <mask>\n"
> > +	"ecc inject low <mask>\n"
> > +	"ecc inject ecc <mask>\n"
> > +	"\t- XOR 'mask' with high/low data or ECC\n"
> > +	"ecc inject off\n"
> > +	"\t- disable error injection\n"
> > +);

Hi Dave,
You can inject data in the upper/lower 32 bit data path, or in the ecc
path using the "ecc inject" command shown above.  The inject command
takes a mask that is XORed with the proper data, eg "ecc inject low 0x5"
would result in data bits 0 and 2 always being swapped resulting in
multibit errors.

Or you could ground 2 data pins on the PCB:)

Peter