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Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/2] m48t59: add year offset and MMIO

From: Artyom Tarasenko
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/2] m48t59: add year offset and MMIO ISA mapping
Date: Tue, 20 Jan 2015 11:16:22 +0100

On Mon, Jan 19, 2015 at 10:59 PM, Hervé Poussineau <address@hidden> wrote:
> Le 19/01/2015 12:35, Mark Cave-Ayland a écrit :
>> This patch lays the groundwork for switching sun4u over from ioport NVRAM
>> access to MMIO NVRAM access.
>> Patch 1 introduces a new year_offset property which is the offset between
>> the
>> year value stored in hardware and the actual year. In particular, Sun
>> hardware
>> has a 68 year offset used to extend the date range of the IC. While the
>> kernel sources I have viewed contain this offset within a #ifdef
>> block, I've updated all the callers so that no change in behaviour will be
>> seen across all platforms. PPC users may wish to alter the callers to
>> change
>> this behaviour as required.
>> Patch 2 mimics the mem_base parameter from m48t59_init() to
>> m48t59_init_isa()
>> so that MMIO can be used for sun4u where the NVRAM is attached to the ebus
>> which is essentially the same as an ISA bus.
> I've a patch which QOM'ifies m48t59, that I'll send to the list.
> If you apply it, you'll be then able to create a sysbus-m48t02 device, and
> then to add it to ebus memory region.

Why m48t02? As discussed before, it shall be a m48t59 device:



Artyom Tarasenko

SPARC and PPC PReP under qemu blog: http://tyom.blogspot.com/search/label/qemu

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