On Sat, Apr 6, 2013 at 10:52 AM, Dirk Behme dirk.behme@gmail.com wrote:
Most probably it would be sufficient to enable only the clocks needed for booting ;) And not all clocks. On the other boards we do
/* set the default clock gate to save power */ DATA 4 0x020c4068 0x00C03F3F DATA 4 0x020c406c 0x0030FC03 DATA 4 0x020c4070 0x0FFFC000 DATA 4 0x020c4074 0x3FF00000 DATA 4 0x020c4078 0x00FFF300 DATA 4 0x020c407c 0x0F0000C3 DATA 4 0x020c4080 0x000003FF
http://git.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=blob;f=board/freescale/...
Do you like to try anything similar here, too?
No, sorry. It is possible to turn some clocks off, for sure, but I do not see real benefit by doing this on this solo-lite board.
U-boot runs only for few seconds (or ms), so not much of power savings we can do in the bootloader.
I am just setting the clocks to the default states, so it is up to the kernel to manage the clocks as needed.
And I don't want to face the risk to turn some clocks off and then realize later that the kernel was expecting a clock to be on and start seeing weird run-time issues.