[U-Boot] MMU init code in uboot for MX31 PDK

[Paul Thomas]

On Thu, Jun 4, 2009 at 10:51 AM, Magnus Lilja <lilja.magnus at gmail.com>wrote:

> 2009/6/4 alfred steele <alfred.jaquez at gmail.com>:
> >> The MMU is not used in ARM/U-boot, at least not on the i.MX31.
> > I was thinking there has to be a mechnism which defines the
> > phystovirtual mapping table before the kernel starts running in the
> > virtual space and the IO peripherals to access memory space/registers.
> > Redboot does the same, hence i thought u-boot must be doing it
> > somewhere.
>
> That's done by the kernel in the early startup after decompressing.
>
> /Magnus
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u-boot needs to initialize the ram, but the MMU isn't needed by either the
ram or the rest of the memory mapped I/O. For the imx27 external ram (for
CSD0) is located at 0xa0000000 but like the rest of the memory map this
doesn't need to be "setup".

thanks,
Paul