On Dec 10, 2007 10:19 AM, Corey Osgood corey.osgood@gmail.com wrote:
aaron lwe wrote:
Dear all,
the via v-link bus is for data communication between northbridge and sourthbridge, if I just want to make dram work, do I need to configure the v-link bus?
thanks.
No, vlink can be handled before or after ram init, and it isn't even necessary, if no config is done it will default to the slowest operating mode (newer chipsets may bootstrap to higher modes, depending on motherboard design). However, you do have to program the CPU bus registers and all the various dram config registers before ram init. Getting these settings right may be a real pain, depending on what chipset you're dealing with.
-Corey
Thanks Corey. I've been trying to make cn700 work, until now without luck. I've programmed host bus and some dram controller registers, but not all. how can I know which registers should be programmed and which needn't? can you give me some advices? thanks.