From: Peter Asemann <peter.asemann@web.de>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] u-boot-related but maybe off-topic question
Date: Mon, 17 Jan 2005 14:30:52 +0100 [thread overview]
Message-ID: <41EBBE0C.7000706@web.de> (raw)
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
reply other threads:[~2005-01-17 13:30 UTC|newest]
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