Re: [microblaze-uclinux] Re: [microblaze-uclinux] LMB usage

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Mickael,

Haudebourg, Mickael (Silica) wrote:
>  
>   thanks . But why do we have to map the DDR in this place. What is put
> by linux in this place ? Var directory ?
> I want to put the flash at 0

You can put flash at zero if you want to - but you will obviously have 
to make sure the contents are sensible before the CPU boots.

You will need to do a bit of kernel and u-boot customisation to support 
this configuration.  For example kernel early startup in 
arch/microblaze/kernel.setup.c does things like copying 
reset/interrupt/exception vectors down to addresses 0x0 ->0x20.  In your 
system these will have to be written into flash before boot somehow.

Similarly the PetaLinux autoconfigured u-boot target makes some 
assumptions about memory layout, which you'll need to modify.

So, not impossible at all, but you have some work to do to make it happen.

Regards,

John

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