[U-Boot-Users] u-boot-related but maybe off-topic question

[U-Boot-Users] u-boot-related but maybe off-topic question

[Peter Asemann]

Ehm... first of all I want to beg for pardon for posting this maybe 
rather off-topic question.

It's just that I'm not sure about how to program the memory controller 
of my MPC875 in the u-boot:

Though it seems possible to issue only one refresh command each time the 
memory refresh timer expires, it seems to be common to have the 
refresh-timer expire more seldom and issue more refresh-commands in a 
row each time to compensate for this.
Issuing a refresh-command is only possible in "all banks precharge" 
state, the sdram memory datasheet says. So what I need to know is: Which 
operations cause a memory bank to be "un-pre-charged"? I can't find that 
information anywhere, it's like it's so trivial that noone mentions it.

Thanks for your time,

Peter Asemann