[U-Boot] problem with mpc837x start.S

[shawn Bai]

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> Date: Tue, 2 Aug 2011 10:21:09 -0500
> From: scottwood at freescale.com
> To: programassem at hotmail.com
> CC: u-boot at lists.denx.de
> Subject: Re: [U-Boot] problem with mpc837x start.S
>
> On Tue, 2 Aug 2011 04:11:25 +0000
> shawn Bai <programassem at hotmail.com> wrote:
>
> > > When flash is enlarged to 4GiB, it repeats throughout the address space.
> >
> > After flash is enlarged to 4GiB, why will it repeat through the address space? the whole 4GiB address space?How does it happen?
>
> It's just how the hardware works -- the flash chip only sees the address
> bits that are relevant to its size. The higher address lines can be
There must be something needed to learnt by myself to understand "how the hardware works".
And, when you mention "its size", you mean 8MBytes,or 4GiB?
I cannot turn the corner at this moment.
-Shawn

> anything, as long as they cause the transaction to be routed to the
> flash chip.
>
> -Scott
>