linux-kernel - Re: [v3.8 Regression] watchdog: sp5100

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Date:	Sat, 23 Feb 2013 15:14:32 +0900
From:	Tanaka Takahisa <mc74hc00@...il.com>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
Cc:	Joseph Salisbury <josephtsalisbury@...il.com>,
	Wim Van Sebroeck <wim@...ana.be>,
	linux-watchdog@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Kernel Team <kernel-team@...ts.ubuntu.com>
Subject: Re: [v3.8 Regression] watchdog: sp5100_tco: Add SB8x0 chipset support

Hi Joseph,

Thank you for testing!
I will submit this patch to the linux-watchdog community after adding
commit log to patch.

2013/2/22 Joseph Salisbury <joseph.salisbury@...onical.com>:
> The I/O data can be seen at:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1116835/+attachment/3540738/+files/iomem.txt

In the case of SP5100 and SB7x0 chipset, the sp5100_tco driver
overwrites a free resource I/O memory address obtained by
allocate_resource() to the MMIO address registers for watchdog timer.
In the case of M3A78-CM, the sp5100_tco driver was using 0xfed45000 as
a MMIO address. Since 0xfed45000 is the free I/O memory resource
address, this is the expected behavior.

  [   18.852540] sp5100_tco: Using 0xfed45000 for watchdog MMIO address

However, Rewriting the MMIO address registers for the watchdog timer
must have generated the problem. I think that the problem has occurred
with the chipset or the BIOS layer. So, It's difficult for me to
investigate the problem, and the problem is critical. Thus, I decided
to delete the concerned codes.

Regards,
Takahisa
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