Skip to main content

Browse the archive

https://github.com/torvalds/linux
05 April 2024, 19:05:47 UTC
Revision 18e4321276fcf083b85b788fee7cf15be29ed72a authored by Takahisa Tanaka on 03 March 2013, 05:52:07 UTC, committed by Wim Van Sebroeck on 22 March 2013, 22:21:47 UTC 
watchdog: sp5100_tco: Remove code that may cause a boot failure
 
A problem was found on PC's with the SB700 chipset: The PC fails to
load BIOS after running the 3.8.x kernel until the power is completely
cut off. It occurs in all 3.8.x versions and the mainline version as of
2/4. The issue does not occur with the 3.7.x builds.

There are two methods for accessing the watchdog registers.

 1. Re-programming a resource address obtained by allocate_resource()
to chipset.
 2. Use the direct memory-mapped IO access.

The method 1 can be used by all the chipsets (SP5100, SB7x0, SB8x0 or
later). However, experience shows that only PC with the SB8x0 (or
later) chipsets can use the method 2.

This patch removes the method 1, because the critical problem was found.
That's why the watchdog timer was able to be used on SP5100 and SB7x0
chipsets until now.

Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1116835
Link: https://lkml.org/lkml/2013/2/14/271

Signed-off-by: Takahisa Tanaka <mc74hc00@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: stable <stable@vger.kernel.org>
1 parent 9217cbb
History
Tip revision: 18e4321276fcf083b85b788fee7cf15be29ed72a authored by Takahisa Tanaka on 03 March 2013, 05:52:07 UTC
watchdog: sp5100_tco: Remove code that may cause a boot failure
Tip revision: 18e4321
File Mode Size
Documentation
arch
block
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 1.1 KB
.mailmap -rw-r--r-- 4.4 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 93.0 KB
Kbuild -rw-r--r-- 2.5 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 243.5 KB
Makefile -rw-r--r-- 47.0 KB
README -rw-r--r-- 18.3 KB
REPORTING-BUGS -rw-r--r-- 3.3 KB

README

back to top