[U-Boot] [PATCH] arm: pxa: PXA270 D-Cache as ram

Sergey Yanovich
2013-05-21T16:31:07Z

On Tue, 2013-05-21 at 17:00 +0200, Marek Vasut wrote:
> > Yes, the patch as it is will only affects relocation speed and preserve
> > SRAM from corruption.
>
> Now this is the right (convincing) argument! What kind of corruption ? When does
> it occur ?

The whole 256 kB of SRAM could be used for persistent storage with the
patch. Without it, part of SRAM should be dedicated for U-Boot stack or
be overwritten on boot.

> > The speed gain can also be applied to uImage
> > copying/unpacking, but that requires deeper understanding than I have at
> > the moment.
>
> Uh ... I lost you here. Can you please elaborate some more ?

You are right. After SDRAM is configured, it is enough to turn on data
caching to receive its speed benefits.