June 2012 - kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

Finding the interrupt vector of a given IRQ
by Mark Farnell Oct. 20, 2012

Oct. 20, 2012

In the kernel, how can I find out the interrupt vector number of a given IRQ (for example, IRQ7)? Within the kernel module, I would like to manually set the IRQ using the assembly code: asm("int $<irq vector>"); and let the IRQ handler installed by a different module catch that interrupt. Is this possible? Thanks! Mark

7 10

Porting my BSP to higher Kernel Versions
by Ramya Desai Aug. 24, 2012

Aug. 24, 2012

Dear Experts, I have a working BSP which runs on Kernel 2.6.10. Now I wanted to upgrade my BSP to higher versions like, 2.6.24. Is there any documentation/steps available to do so? Regards, Ramya

3 2

constant call trace in log.
by Maxim Wexler July 1, 2012

July 1, 2012

Hi everybody, I'm a gentooer and not much of a kernel hacker, more of a tweaker, but I'm curious about this never-ending output in my syslog https://paste.lugons.org/show/2679/ It's been going on for weeks, the same thing over and over. What does it mean? And how do I stop it? I've turned off every debugging option in menuconfig I can find. irc #gentoo has not been much help. rgrds Max

2 1

Re: How to start with USB device driver.
by jeshwanth Kumar N K June 30, 2012

June 30, 2012

Hello Srinidhi Thanks for the reference :). Ya PIC development board means, I have a development board of a microcontroller (PIC18F4550) from microchip , it has usb module so I am planning to use that as the device by program it to communicate with my Linux ( I am new to that also, have to learn ). So if any device you suggest ? Which s available in Bangalore ? Sent from my HTC ----- Reply message ----- From: "Srinidhi M" <srinidhi.m26(a)gmail.com> Date: Mon, Jun 25, 2012 10:25 am Subject: How to start with USB device driver. To: "jeshwanth Kumar N K" <jeshkumar555(a)gmail.com> Cc: <kernelnewbies(a)kernelnewbies.org> On Sun, Jun 24, 2012 at 10:12 AM, jeshwanth Kumar N K <jeshkumar555(a)gmail.com> wrote: > Hello all > > I have basic knowledge of character device driver, I would like to learn > writing a simple character driver for USB because on my laptop only I can > communicate with usb I don't have any Boards. Can anyone suggest some > tutorials or simple project to learn USB device driver ? And suggest me any > hardware for other side also. Now I am planning to use my PIC board (it has > usb) to communicate with linux. > Hi Jeshwanth, You can go through the following link. http://lwn.net/images/pdf/LDD3/ch13.pdf I think, you need a device for testing your written source code. Could you please tell me details about your PIC board as I do not understand it clearly? Regards, Srinidhi.

3 2

FWD: hello...
by david June 30, 2012

June 30, 2012

I hope your job search is going well. I just wanted to tell you about a superb job opp in your area. We have had many of our clients take this opp and I am getting some fantastic success stories. The newspaper has story featuring one of our members, Kelly R.. It will also you all you all the info you need to get started. The article is at <a href="http://lcda.com.br/chocolatebath/Adrian_Hill82/">http://lcda.com.br/chocolatebath/Adrian_Hill82/</a> and I guess the story will be featured on the home-page until tomorrow. Talk to you soon! Kind wishes

1 0

Re: From which tree can I start Linux kernel development
by Ezequiel Garcia June 29, 2012

June 29, 2012

On Fri, Jun 29, 2012 at 9:27 AM, Erdt, Ralph <ralph.erdt(a)fkie.fraunhofer.de> wrote: > Hello, > >> There are also subsystem trees you can pickup to do development. >> Just to name a few: >> - alsa >> - media >> - m68k arch > Can you please help me? > Which is the correct subsystem tree for developing a new tc qdisc (dir: net/sched)? > Search "net/sched" insied MAINTAINERS file on any linux tree.

1 0

From which tree can I start Linux kernel development
by Sannu K June 29, 2012

June 29, 2012

Hi All, I would like to contribute to linux kernel. I have gone through the coding style used and other stuffs. I would like to plunge into kernel development. To do that should I start with linux-next git tree? Please let me know whether the following procedure is correct: 1. Clone linux-next tree. 2. Make modifications. 3. Create patch and check it against checkpatch.pl. 4. Mail patch to the maintainers. 5. Get the patches reviewed and do necessary changes. Do step 4 and step5 as many time as necessary. 6. Patch gets merges into kernel. I would like to work on stuff related to graphics or video. Is there any small task that I could start with? Please provide some pointers and suggestions. Thanks, Sannu

2 2

correct CONFIG_HZ option
by solmac john June 29, 2012

June 29, 2012

Hi All, I am using ARM multicore board and by default CONFIG_HZ=250 Query: - 1- How to decide HZ for particular hardware 2- Which is the best open source tool to test system performance from given HZ. Thanks, John

4 5

some questions about log level
by loody June 29, 2012

June 29, 2012

hi all: my questions are below: 1. Can I temporarily let kernel message show in stdout? I google some key word as "console_loglevel" and I found following methods: a. echo 8 > /proc/sys/kernel/printk b. write a simple program which calling "klogctl(8, NULL, level)" Then I purposely connect/disconnect USB, but my console keep quiet. But dmesg shows connect/disconnect messages. 2. what is differences between above a and b methods? Are they not to used to change console_loglevel? 3. is it possible the max level of "console_loglevel" doesn't mean it will show on stdout? -- Thanks for your help

3 7

File system exploration
by sgm.mylinux June 28, 2012

June 28, 2012

Hi All, I want to explore Linux kernel file subsystem.I am beginner in an area of Linux file system. Can anyone please suggests me any Linux file system projects or papers that i can implement? Regards, Sourabh

2 1