[U-Boot] [PATCH] mx6qsabresd: Add basic support

[Dirk Behme]

On 13.04.2012 17:56, Fabio Estevam wrote:
> On Wed, Apr 11, 2012 at 6:36 PM, Wolfgang Denk<wd at denx.de>  wrote:
>
>> Does testing just the first 64 KiB of RAM make any sense? Not to me.
>
> Ok, I will expand the mtest range.
>
>> BTW: where are the exception vectors located?
>
> I don't know actually, but would like to learn about it. Looked at the
> generated u-boot.map and could not find it out.
>
> Stefano,
>
> Can you please help me to find a safer DDR location for performing
> mtest on mx6? I think we probably have the same issues on other i.MX
> processors as well. Do you know how can I locate the address range
> that the exception vectors occupy?

Regarding the exception vectors:

I would think that the code of the U-Boot exception vectors are located at

#define CONFIG_SYS_TEXT_BASE           0x17800000

and

#define CONFIG_LOADADDR                        0x10800000

after relocation using

http://git.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=blob;f=arch/arm/cpu/armv7/start.S;h=ef08a55abc2c6189062c9d87c36d5d042139017c;hb=HEAD#l37

and

http://git.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=blob;f=arch/arm/cpu/u-boot.lds;h=e49ca0c5522912ba8849182105cf141e04d0c6b3;hb=HEAD#l36

So as long as we don't have the MMU enabled, these vectors aren't used 
at all. I would expect that the BootRom exception vectors at address 
0x00000000 are used, instead.

I might be wrong, so people please correct me ;)

Best regards

Dirk