Messages in this thread | | | Date | Tue, 12 May 2009 17:42:11 +0800 | Subject | Re: [PATCH 1/2] XCEP PXA255 Processor Board | From | Eric Miao <> |
| |
>> > +MACHINE_START(XCEP, "Iskratel XCEP") >> > + .phys_io = 0x80000000, >> > + .io_pg_offst = 0xf8000000, >> ...... you sure this is correct? Please have a reference to other platforms. > Now this is very odd. I've updated these two fields to conform to other > PXA architectures ... but it looks as if these fields don't actually make > any difference. I 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |