I would recommend you get the following books.
Embedded Linux: Hardware, Software, and Interfacing by Craig Hollabaugh
Linux Device Drivers, 2nd Edition by Alessandro Rubini, Jonathan Corbet
Building Embedded Linux Systems by Karim Yaghmour
-Original Message-
From: Paul Miller [mailto:[EMAIL PROTECTED]
Sent: Wednesday, October 29, 2003 9:08 AM
To: linuxppc-embedded at lists.linuxppc.org
Subject: 405EP peripheral memory access
Hi,
I am new to Linux embedded programming. I have experience programming
microcontrollers and DSPs without an operating system, so I have some
idea what I'm doing. Anyhow, I'm trying to use the peripheral memory
bus on my 405EP CerfCube from Intrinsyc. Does anyone have an example
that I can work from?
To setup the memory's timings, I need access to the DCR register. In
the PowerPC datasheet it says to use assembly instructions mtdcr and
mfdcr. I don't know much about assembly, but I found a kernel patch
that uses these functions. So, working off this patch, I tried making
a simple program to read these registers. When I run it, Linux reports
an Illegal instruction and doesn't let me access the register.
Does access to this bus need to be done in kernel mode? If so, where
can I find more information about writing a kernel driver? Ideally,
I'd like to just open a device file and read/write to the bus.
Thanks!
-Paul
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
