August 2014 - kernelnewbies@kernelnewbies.org

Kernel Compilation Error
by Niamathullah sharief Aug. 19, 2014

Aug. 19, 2014

Dear Friends Please advice me what to do for the below error which i am getting while install modules when i give "make modules_install" command i am getting the following error *[root@localhost linux-3.15.1]# make modules_install INSTALL arch/x86/crypto/crc32-pclmul.koCan't read private keymake[1]: *** [arch/x86/crypto/crc32-pclmul.ko] Error 2make: *** [_modinst_] Error 2* Please help me Regards Sharief Kernel Newbie

2 1

Why I can't map memory with mmap
by Kevin O'Gorman Aug. 19, 2014

Aug. 19, 2014

maybe someone here can help me figure out how to map a big (really big) work area and lock it in memory. I wrote a little test program to try this out, and it fails. As a regular user, perror() tells me some "resource is temporarily unavailable". As root, it says it "cannot allocate memory". I'm only asking for 1 byte. What's the problem? BTW it also fails if it asks for a mibibyte (1<<20). Here's the whole program /** * @file * <pre>"Find out the limits on locked memory" * Last Modified: Mon Aug 18 07:31:01 PDT 2014</pre> * @author Kevin O'Gorman */ #define _GNU_SOURCE /* enable some of the mmap flags */ #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <sys/mman.h> int main(int argc, char *argv[]) { void *where; size_t length = 1; where = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_LOCKED | MAP_POPULATE, -1, 0); if (where != MAP_FAILED) { printf("Mapped at %p\n", where); } else { perror("Mapping failed"); } return EXIT_SUCCESS; } -- Kevin O'Gorman programmer, n. an organism that transmutes caffeine into software. Please consider the environment before printing this email.

4 9

Beagleboard and Panda Board Drivers
by Nick Krause Aug. 18, 2014

Aug. 18, 2014

I would like to read the code for these drivers and am not sure where the code for them is. If someone can send me the directory that would be great as I am not sure where the code is. Thanks Nick

10 16

Linux PCI driver.
by testlaster Aug. 18, 2014

Aug. 18, 2014

Hey Guys Im writing a PCI driver in Linux ( Lubuntu ). Now its not an entire driver its really just a little program that will latch onto a space of ram and dump the entire content of the ram into a file. I have done this before in a Unix/Linux based OS and it took me quite a while to figure it out. So at startup the configuration for the PCI is already done so I wont have to do any of that myself. I really just need to set a pointer to a register. My problem is that I cant find the functions to do that for linux. I cant find similar functions to things like : PCI_ATTACH() pci_attach_device(); mmap_device_memory(); I think that is really all I need at the moment. Anybody have some ideas of where I can start looking? Thanks and regards.

2 4

Re: Problem in Compiling Wireless Adapter(9271) Driver for Cubieboard
by Freeman Zhang Aug. 18, 2014

Aug. 18, 2014

Hi anupam, Thanks so much for your information. It is of great value! May I ask how did you find that? In case I run into similar situation next time so that I can help myself, as well as others. Thanks agagin! Freeman Zhang On 2014-08-18 16:52, anupam kapoor wrote: >>>>>> [Mon, 18 Aug 2014 16:41:32 +0800]: "Freeman Zhang" (freeman-zhang): > ,----[ freeman-zhang ] > | In file included from include/linux/timex.h:174:0, > | from include/linux/jiffies.h:8, > | from include/linux/ktime.h:25, > | from include/linux/timer.h:5 > | from include/linux/workqueue.h:8, > | from include/linux/kmod.h:26 > | from include/linux/module.h:13 > | from /home/cubie/src/ath9k/htc.h:20, > | from /home/cubie/src/ath9k/htc_hst.c:17: > | /usr/src/linux-headers-3.4.79-sun7i/arch/arm/include/asm/timex.h:15:24: > | fatal error: mach/timex.h: No such file or directory > `---- > http://lists.infradead.org/pipermail/linux-arm-kernel/2011-August/060045.ht… > > kind regards > anupam

1 0

mini2440
by Sudip Mukherjee Aug. 18, 2014

Aug. 18, 2014

hi, Has anyone tried to boot the linux-next in the mini2440 boards? I have tried with mini2440_defconfig and it is not even booting. I posted the problem in the forum of friendlyarm (http://www.friendlyarm.net/forum/topic/6076) but the only answer i got is we need to a number of patch to make the mainline kernel boot into mini2440. Well , Ok , I can prepare the patch but my question is if mini2440_defcofconfig is there in the mainline kernel , that means it has been properly tested before adding , and that only means that I must be doing some mistake and thats why its not booting. So can anyone give any pointer to how i can make the linux-next boot on a mini2440 board ? the filesystem is the default filesystem given by the friendlyarm guys. Thanks Sudip

2 1

Query regarding page access protection flags linux kernel
by ravali pullela Aug. 18, 2014

Aug. 18, 2014

Hello, I am trying to understand the page fault handling and MMU. These are my queries 1) What is the exact difference between the protection flags in vm_area_struct and pte's protection flags of the page. Does the field "pgprot_t vm_page_prot" in vm_area_struct contain the protection flags of all the pages in that vm_area? If so how to set these for individual pages? I have come across this http://marc.info/?l=linux-mm&m=109422600806490 But could not find any answer to this post. 2) Does MMU (x86 arch) check the vm_area prot flags or the page's pte flags to cause the page fault? Please help !! Thanks, Ravali

3 2

Problem in Compiling Wireless Adapter(9271) Driver for Cubieboard
by Freeman Zhang Aug. 18, 2014

Aug. 18, 2014

Hi List, I don't know how many people in the list have played with cubieboard. It is really fun :D The Sad thing is that, I have a usb wireless adapter TL-WN721N(with 9271 chipset) that doesn't work on the board. The system is Cubian Linux(derieved from Debian for the cubieboard). I googled around, find the driver is called "ath9k_htc". Later, I find the driver's source code in the kernel for Cubian. I compiled it but all I'd got is this: In file included from include/linux/timex.h:174:0, from include/linux/jiffies.h:8, from include/linux/ktime.h:25, from include/linux/timer.h:5 from include/linux/workqueue.h:8, from include/linux/kmod.h:26 from include/linux/module.h:13 from /home/cubie/src/ath9k/htc.h:20, from /home/cubie/src/ath9k/htc_hst.c:17: /usr/src/linux-headers-3.4.79-sun7i/arch/arm/include/asm/timex.h:15:24: fatal error: mach/timex.h: No such file or directory How can I deal with this error? Does the existence of the driver's code in the kernel source means that it has already been ported to Cubian? You can get more information about Cubian and its kernel source in: http://cubian.org/sources/ Thanks for your attention! Freeman Zhang

1 0

Option CONFIG_DEBUG_SET_MODULE_RONX not working for kernel 3.10
by Chetan Nanda Aug. 17, 2014

Aug. 17, 2014

Hi, I am trying to enable 'CONFIG_DEBUG_SET_MODULE_RONX' config option on 3.10 kernel (for ARM arch) via writing CONFIG_DEBUG_SET_MODULE_RONX=y at the end of board specific config file. But .config generated after kernel build do not have this option enabled. Do I need to enable any other option also before enabling this one? Thanks, Chetan Nanda

3 3

Kernel Dev - Nick Krause
by Andrew Bourhill Aug. 16, 2014

Aug. 16, 2014

Nick, I've been reading the lists for a long long time. My day job is senior embedded linux developer for a mobile comms company, I have many many years experience under my belt. from what I see is a young fella, possibly fresh out of university trying to cut his teeth on the kernel. take my advice, leave it alone , you are far too in-experienced to be trying this. your post to the list are becoming tiresome. leave it alone, go away and develop your coding skills by writing programs of your own. (i would suggest something simple to start - helloworld).. this stuff is far too complicated for you - especially device drivers. (these need knowledge of the hardware , also knowledge about how hardware works) just a bit of friendly advice. Abo

3 3