[U-Boot] [PATCH v3] Add support for MINI2440 (s3c2440). Documentation about the product can be found on: http://www.friendlyarm.net/products/mini2440

[Ilya Averyanov]

Dear Marek Vasut,

Would you please explain, why do you want to initialize the sdram has been in
C code.
If for provide this feature should be written assembly code. And it would
sometimes even harder than the initialization code sdram?

2012/4/21 Marek Vasut <marex at denx.de>

> Dear Ilya Averyanov,
>
> > 2012/4/21 Vasily Khoruzhick <anarsoul at gmail.com>
> >
> > > 2012/4/21 Ilya Averyanov <averyanovin+uboot at gmail.com>:
> > > > No have problem.
> > > > Available only if you boot from NOR flash.
> > > > If you boot from the NAND 4kb of SRAM (steppingstone) not available.
> > >
> > > For NAND boot it's mapped at 0x0
> > > For NOR boot it's mapped at 0x40000000
> > >
> > > NAND controller uses it for booting purpose, but anyway for SPL we
> > > should fit code into
> > > 4k (hardware limitation), so I think using assembly here for SDRAM init
> > > is OK.
> > >
> > > And how will you use the internal SRAM when you boot from NAND, if the
> > > SoC
> >
> > writes in the SDRAM read data from NAND, and your data will be
> overwritten.
>
> Why? You'll load SPL into SRAM, then in SPL you'll copy the rest of uboot
> from
> NAND to - then already inited - SDRAM and execute it. We even have
> ready-to-use
> NAND SPL.
>
> >
> > > Regards
> > > Vasily
>
> Best regards,
> Marek Vasut
>