[U-Boot] [PATCH] i.MX28: Add function to adjust memory parameters

Marek Vasut
2012-06-18T14:23:34Z

Dear Fabio Estevam,

> Hi Marek,
>
> On Thu, May 31, 2012 at 3:45 PM, Marek Vasut <marex@denx.de> wrote:
> > Call this or similar in your spl_boot.c to adjust the DRAM configuration.
> > Actually I think even the following value should fix your problem:
> >
> > void mx28_adjust_memory_params(uint32_t *dram_vals)
> > {
> > dram_vals[0x74 >> 2] = 0x0f02010a;
> > }
>
> I finally had a chance to try this and my mx28evk can boot again with
> your patch + the code above.
>
> How do we handle this? Would you send a v2 with this additional code
> or should I do it myself after your original patch in this thread gets
> applied?

Stefano, can you please apply this? So Fabio can apply his on top of it?

> Also, please explain to the mortal folks what 'dram_vals[0x74 >> 2] =
> 0x0f02010a;' means.

Well, check that particular register (memory configuration register at +0x74
offset) in the datasheet. It's basically adjusting the number of enabled address
row and columns.

> It is not something very trivial to figure out :-)

It actually is, see above ;-)

> Thanks,
>
> Fabio Estevam

Best regards,
Marek Vasut