Re: [PATCH 1/2] XCEP PXA255 Processor Board

[Eric Miao]

>> > +MACHINE_START(XCEP, "Iskratel XCEP")
>> > +    .phys_io    Â= 0x80000000,
>> > +    .io_pg_offst  Â= 0xf8000000,
>> ...... you sure this is correct? Please have a reference to other platforms.
> Now this is very odd. ÂI've updated these two fields to conform to other
> PXA architectures ... but it looks as if these fields don't actually make
> any difference. ÂI dug a little, and the only place I could find them
> being used is in arch/arm/kernel/head.S (as MACHINFO_PGOFFIO and _PHYSIO),
> and only there if CONFIG_DEBUG_LL is defined.
>

You are right on this. These are mostly used for the initial mapping
of the IO registers so that low-level debug output like UART output
can work at the very early stage. You will find this very handful if
you are debugging on early bring-up.
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