From: Parav Pandit <paravpandit@yahoo.com>
To: linuxppc-embedded@ozlabs.org
Subject: writing CCSR_BAR register for relocation in MPC8555?
Date: Fri, 28 Jul 2006 04:28:15 -0700 (PDT) [thread overview]
Message-ID: <20060728112815.7059.qmail@web36603.mail.mud.yahoo.com> (raw)
Hi,
I am newbie to MPC8555, PowerPC family and u-boot.
Please guide me.
1. How can I read/write registers from the u-boot
similar to md/mm command? Basically I want to
read/write CCSR_BAR from the u-boot.
2. How can I read/write CCSRBAR register value from my
assembly program?
mfspr.mtspr ??? what is the register name??
3. By changing the default value of 0xFF70:0000 to
0xE000:0000 is sufficient to relocate the 1MB block or
anything else is also required?
4. I look at the u-boot code for tqm85xx, 8555cds, and
8555ads series of boards and it does something with
TLB.
I don't understand why it modifies the TLB registers
whose purpose is only for the performance improvement?
Or we can use the TLB for something else also?
Regards,
Parav Pandit
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