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

From: Hervé Poussineau
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 0/2] m48t59: add year offset and MMIO ISA mapping
Date: Mon, 19 Jan 2015 22:59:17 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.2.0

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 CONFIG_SPARC
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.
IMO, there is no need to add a new parameter to m48t59_init_isa device.

Tell me what do you think of it.


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