[linux-cirrus] Re: u-boot_edb93xx-20060405.patch
- From: "Dubb, Benjamin" <Benjamin.Dubb@xxxxxxx>
- To: <linux-cirrus@xxxxxxxxxxxxx>
- Date: Tue, 16 May 2006 14:54:28 -0400
> Thanks Cory. Looks pretty good. However one quirk
> I'm finding is "mtest" reporting errors as did the
> prototype u-boot Henk Stegeman passed to me about one
> year ago. I would just dismiss it as flaky hardware
> on my side but Henk saw exactly the same mtest failure
> on his board which makes me suspicious:
>
>
> > EDB93xx> mtest
> >
> > Pattern 00000000 Writing... Reading...
> >
> > Mem error @ 0x00000000: found 00200000, expected 00000000
> <snip>
>
The problem you are seeing has to do with how the SDRAM is configured on
ep93xx. The memory space isn't linear. On my EDB9307, it's made of 2 32MB
banks, and they are located at 0 and 0x400000. I'm not sure what 0x200000 is
aliased into, perhaps 0.
Put these in edb93xx.h or whatever your board config file is called, and then
define SDRAM banks correctly in dram_init().
#define CONFIG_SETUP_MEMORY_TAGS 1
#define CONFIG_NR_DRAM_BANKS 2
Cheers,
- Ben
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