Changing PLL settings is somehow tricky on the i.MX27: Whenever the clock
speed of the main PLL is changed, the clock stops for about 100 us until the
PLL locks into the new frequency. While this clock stop, also the SDRAM
controller cannot refresh the memory, because it uses the same clock source.
This can lead into data loss and random system crashes.
This patch divides the PLL setting in two steps. First step is to re-program
the PLL and clock settings to values possible at a core supply of 1.25 V.
Second step is to increase the core power supply to 1.45 V and switch the
CPU clock to the specified 400 MHz.
Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
commit 60b66d0c59013da3294d0b5fb09b937a8b73cf14
Author: Juergen Beisert <jbe@pengutronix.de>
Date: Fri Sep 24 15:00:04 2010 +0200
The i.MX27 has no second level cache, remove include file
Just a little bit cleanup.
Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
before if you specify id = 0 the next available id will be taken
otherwise fail if already registered now as in linux we use -1
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
this will allow each arch to handle the boards more simply and depending on
there need
the env var BOARD will refer to the current board dirent
for sandbox as we have only one board the board dirent is arch/sandbox/board
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Juergen Beisert
Jean-Christophe PLAGNIOL-VILLARD
Sascha Hauer