User:Lesterwm

=ECE497 Pages= These are pages that I have created in order to help the current and next class of ECE497 - Embedded 32-bit Linux

ECE497 Networking over USB

ECE497 Modifying Kernel Command Line Parameters

=Final Project= See ECE497 Projecting with Sense

=Status Report=

Listings

 * Chapter 4
 * [[media:Chapter_4_Listings.tgz‎| Done]]


 * Chapter 5
 * [[media:Chapter5Listings.tgz‎ | Done]]


 * Chapter 6
 * [[media:Chapter 6 Listings.tgz | Done]]


 * Chapter 7
 * [[media:Chapter 7 Listings.tgz | Done]]


 * Chapter 8
 * Done, as part of Lab 08

Labs

 * Lab 00
 * Status: Complete
 * Observations: N/A (I already had linux installed)
 * Answers: N/A


 * Lab 01
 * Status: Complete
 * Observations: Using the SPED image, you can't boot your Beagle using USB OTG for power (it throws a kernel panic). This is because the kernel image included on image does not have the necessary USB gadget module built-in (its a dynamic module).
 * Answers: N/A


 * Lab 02
 * Status: Complete
 * Observations: Build.tar.gz is absolutely huge. Is all of that necessary? I find myself building the kernel outside of the OE tree because it is just too complicated otherwise. This is a great lab and one that I kept coming back to, its extremely important to the course
 * Answers: N/A


 * Lab 03
 * Status: Incomplete
 * Observations:
 * Answers:


 * Lab 04
 * Status: Done
 * Observations: This lab is incomplete, but following its spirit, I configured the kernel to my liking. I had to reconfigure from the default Angstrom configuration when I wanted to get networking and power over USB working, since the USB OTG gadget had to be compiled into the kernel (it can't by a dynamic module). I used gconfig to configure it.
 * Answers: N/A


 * Lab 05
 * Status: Complete
 * Observations: I completed this short lab as part of Lab 08. In that lab I added an Example character device module to the necessary Kconfig file.
 * Answers: N/A


 * Lab 06
 * Status: Complete
 * Observations: I've spent a lot of time on this subject while trying to get static MAC addresses working. I wrote up a wiki article based on what I learned. See ECE497 Modifying Kernel Command Line Parameters.
 * Answers: N/A


 * Lab 07
 * Status: Not Started
 * Observations:
 * Answers:


 * Lab 08
 * Status: Complete
 * Observations: This is definitely my favorite lab. Very well constructed, challenging but not impossible.
 * Answers:

Optional: Stretch time, I though these would be easy, but after reading up on them, they look rather involved. static int hello_open(struct inode *inode, struct file *file) {   /* We can change the logic of this function based on the * minor number of our device */ printk("hello_open: successful opened minor number %u\n",        iminor(inode)); return 0; }
 * 1) The major device number 234 is part of a range of unassigned numbers. What is the range? 231-239
 * 2) What's the new line added to hello_init do? Registers this device driver with the given major number (234) and tells the kernel where to find the required file operation functions (open, read, write, ...)
 * 3) What does mknod do? Creates a file in /dev/ that represents the device with the given major number (in our case, 234)
 * 4) Once your device is running try $ cat /proc/devices. Do you see your device? Yes
 * 5) Convert the example in our text to use the newer method. It's only a couple of additional lines, but you will have to read the book to know how to do it. Done. See hello.c in [[media:Hello.tgz | Hello.tgz]]
 * 6) Modify the scull_load script (call it hello_load) on page 47, of chapter 3, to load your module. Done. See hello_load in [[media:Hello.tgz | Hello.tgz]]
 * 7) Test it with use-hello.c from page 222 of Embedded Linux Primer. Done
 * 8) Write a hello_unload script that will rmmod the driver and remove the nodes in /dev Done. See hello_unload in [[media:Hello.tgz | Hello.tgz]]
 * 9) Modify hello.c to pass the major device number in as a parameter during insmod. Done. See hello.c in [[media:Hello.tgz | Hello.tgz]]
 * 1) How can your driver find what the minor device number is? When the device is opened, an inode reference is passed. There is a macro called 'iminor' which takes an inode and returns the minor number.


 * Lab 09
 * Status: Not Started
 * Observations:
 * Answers:


 * Lab 10
 * Status: Partially Complete
 * Observations:
 * Answers:


 * Lab 11
 * Status: Not Started
 * Observations:
 * Answers:


 * Lab 12
 * Status: Not Started
 * Observations:
 * Answers:


 * Lab 13
 * Status: Not Started
 * Observations:
 * Answers: