]> git.sur5r.net Git - u-boot/commit
ppc4xx: Canyonlands: Disable the RTC M41T62 square wave output
authorStefan Roese <sr@denx.de>
Tue, 10 Jun 2008 13:34:11 +0000 (15:34 +0200)
committerStefan Roese <sr@denx.de>
Thu, 12 Jun 2008 13:50:31 +0000 (15:50 +0200)
commit212ed90615c3d20fa6bd73d70d5153bd0d124e5f
tree3c4a9f6dc173dead6e0d4c13002c8de901e97d96
parenta94f22f08f280905926219e568568964cb9eeb9d
ppc4xx: Canyonlands: Disable the RTC M41T62 square wave output

This patch disables the square wave output of the M41T62 RTC used on
Canyonlands & Glacier. Here the explanation:

The serial real-time clock part used in the design is an
STMicro M41T62. This part has a full-time 32KHz square wave
output that is connected to the TmrClk input to the
processor. The default state for this square wave output is
enabled so the output runs continuously when the board is
powered normally and also from the battery. The TmrClk input
to the processor goes to ground when the power is removed
from the board/processor, and therefore the running square
wave output is driving ground which drains the battery quickly.

Signed-off-by: Stefan Roese <sr@denx.de>
board/amcc/canyonlands/canyonlands.c