Re: SOC: Zedboard: Driver question
is this Finally Working or you are facing some issues ?
Regards
Sanjeev Sharma
On Fri, Jun 13, 2014 at 6:43 PM, Josh Cartwright jo...@eso.teric.us wrote:
On Thu, Jun 12, 2014 at 04:39:25PM +0300, amit mehta wrote:
We are working on a school project in which we are trying to develop a
audio mixer on Zedboard (Development board from Digilent). We have
developed the IP and have integrated it with the overall hardware
using Programmable logic. This board has ARM core. We have a Digilent
pre-configured Linux source which we cross-compiled for ARM board,
device tree blob and bootloader for Zync(BOOT.BIN). The system boots
fine with Linux, but now to expose the recently added hardware
implementation of audio mixer, we are trying to develop the driver
using the platform driver API. Currently, In our reconfigurable
hardware, we have 2 channels and a mixer and we want to access those
individually as some file nodes under /proc FS. The sample code is
shown below:
[..]
It wasn't clear what your problem was, or if you were just asking for
advice, but I will add one comment that will hopefully save you some
debugging time:
#include linux/kernel.h
#include linux/module.h
#include asm/uaccess.h /*Needed for copy_from_user */
#include asm/io.h /*Needed for IO Read/Write
Functions */
#include linux/proc_fs.h/*Needed for Proc File System
Functions */
#include linux/seq_file.h /*Needed for Sequence File
Operations */
#include linux/platform_device.h/*Needed for Platform Driver
Functions */
/* Define Driver Name */
#define DRIVER_NAME myiir
unsigned long *base_addr; /* Vitual Base Address */
struct resource *res; /* Device Resource Structure */
unsigned long remap_size; /* Device Memory Size */
The way this driver is written, you will actually be probed three times,
once per node in the device tree. The drivers' use of global state here
is going to bite you.
[..]
static int __devinit myiir_probe(struct platform_device *pdev)
{
struct proc_dir_entry *myiir_proc_entry[3];
int ret = 0;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(pdev-dev, No memory resource\n);
return -ENODEV;
}
remap_size = res-end - res-start + 1;
if (!request_mem_region(res-start, remap_size, pdev-name)) {
dev_err(pdev-dev, Cannot request IO\n);
return -ENXIO;
}
base_addr = ioremap(res-start, remap_size);
if (base_addr == NULL) {
dev_err(pdev-dev, Couldn't ioremap memory at 0x%08lx\n,
(unsigned long)res-start);
ret = -ENOMEM;
goto err_release_region;
}
[..]
static const struct of_device_id myiir_of_match[] __devinitconst = {
{.compatible = dglnt,myiir-audio-ch0},
{.compatible = dglnt,myiir-audio-ch1},
{.compatible = dglnt,myiir-audio-mix0},
{},
};
Are these really separate IP blocks entirely, or just multiple instances
of the same IP block (perhaps with different parameters used during
synthesis)? If the latter, then they should really share a compatible
string that reflects the name/version of the IP block; handling which
block is which channel should be done at a higher level.
Good luck,
Josh
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Re: Adding new board support
Also It is depends on Kernel Version you are trying to add support for New Board.If your Kernel version doesn't support device tree blob then adding some Board files would be sufficient enough and you can also take reference from the other Board which is similar to your Board. Regards Sanjeev Sharma On Sat, Jun 14, 2014 at 9:29 PM, Thomas Petazzoni thomas.petazz...@free-electrons.com wrote: Hello, On Sat, 7 Jun 2014 12:57:34 +0530, AYAN KUMAR HALDER wrote: 1. Create a config file under arch/arm/configs/ for your board. You may refer to any of the standard configuration which closely resembles your board's configuration. To start with enable the basic configurations such as processor, timer, uart, etc and disable SMP which are the bare minimum requirements for the board to boot. 2. Add a folder under arch/arm/mach-yourplatformname. Add board.c where your can register your platform devices such as pcie, nand, usb, uart, gpio, rtc etc 3, Under the same folder above, add timer.c to initialize your timers.Add clock.c to enable/disable clocks and change clock rate of various Functional Blocks. Add yourplatformname.c to initialize your processor specific details such as global timers, arm pmu, interrupts, cache, global dma, ACP, SCU and inter-processor interrupt( if later you decide to enable SMP) 4. It is advisable to refer to a standard platform (like versatile - express ) to understand the board specific configurations in Linux. Sorry to say so, but those recommendations are quite wrong when the goal is to add the support for a new _board_ in the kernel. What you're describing here are roughly the steps to add the support for a new SoC or family of SoC. If what's needed is adding support for a new board that uses an ARM SoC already supported by the kernel, then all what's needed is either writing a Device Tree file (if the ARM SoC in question is supported through the Device Tree) or writing a board file in an existing mach-foo folder. Best regards, Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Unsuccessful transactions during usb enumeration
On Wed, Jun 18, 2014 at 06:26:23AM +, Ranjith T. C. wrote: Thanks for the reply. What exactly do you mean by this? What I meant is whether it could be could be an of the USB controller driver or the hardware? It could be both. Or a bad cable, or bad connection. Try putting some debugging code in the Linux device side and see what that is telling you is happening. Try plugging the device into different operating systems with different types of host controller hardware to see if it is a timing issue. Good luck, greg k-h ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Unsuccessful transactions during usb enumeration
Hi Greg, In one of my imx6 based Board when I connect USB Disk first time everything work's ok and I can read/write content from USB Flash Driver but when I do eject and connect again I could see below continuous messages from dmesg and disk never mounted. 218.431346] FAT-fs (sda): Directory bread(block 480) failed 3[ 218.431362] FAT-fs (sda): Directory bread(block 481) failed 3[ 218.431374] FAT-fs (sda): Directory bread(block 482) failed 3[ 218.431386] FAT-fs (sda): Directory bread(block 483) failed 3[ 218.431398] FAT-fs (sda): Directory bread(block 484) failed 3[ 218.431420] FAT-fs (sda): Directory bread(block 485) failed 3[ 218.431432] FAT-fs (sda): Directory bread(block 486) failed 3[ 218.431444] FAT-fs (sda): Directory bread(block 487) failed 3[ 218.431466] FAT-fs (sda): Directory bread(block 488) failed 3[ 218.431478] FAT-fs (sda): Directory bread(block 489) failed 3[ 218.431499] FAT-fs (sda): Directory bread(block 490) failed 3[ 218.431515] FAT-fs (sda): Directory bread(block 491) failed 3[ 218.431528] FAT-fs (sda): Directory bread(block 492) failed 3[ 218.431540] FAT-fs (sda): Directory bread(block 493) failed 3[ 218.431551] FAT-fs (sda): Directory bread(block 494) failed 3[ 218.431563] FAT-fs (sda): Directory bread(block 495) failed 3[ 218.431592] FAT-fs (sda): Directory bread(block 496) failed 3[ 218.431604] FAT-fs (sda): Directory bread(block 497) failed 3[ 218.431616] FAT-fs (sda): Directory bread(block 498) failed 3[ 218.431627] FAT-fs (sda): Directory bread(block 499) is this probably issue in driver where It is failing to properly re-init the USB device 2nd time ? Regards Sanjeev Sharma On Wed, Jun 18, 2014 at 12:09 PM, Greg KH g...@kroah.com wrote: On Wed, Jun 18, 2014 at 06:26:23AM +, Ranjith T. C. wrote: Thanks for the reply. What exactly do you mean by this? What I meant is whether it could be could be an of the USB controller driver or the hardware? It could be both. Or a bad cable, or bad connection. Try putting some debugging code in the Linux device side and see what that is telling you is happening. Try plugging the device into different operating systems with different types of host controller hardware to see if it is a timing issue. Good luck, greg k-h ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Unsuccessful transactions during usb enumeration
On Wed, Jun 18, 2014 at 12:22:33PM +0530, sanjeev sharma wrote: Hi Greg, In one of my imx6 based Board when I connect USB Disk first time everything work's ok and I can read/write content from USB Flash Driver but when I do eject and connect again I could see below continuous messages from dmesg and disk never mounted. 218.431346] FAT-fs (sda): Directory bread(block 480) failed 3[ 218.431362] FAT-fs (sda): Directory bread(block 481) failed 3[ 218.431374] FAT-fs (sda): Directory bread(block 482) failed 3[ 218.431386] FAT-fs (sda): Directory bread(block 483) failed 3[ 218.431398] FAT-fs (sda): Directory bread(block 484) failed 3[ 218.431420] FAT-fs (sda): Directory bread(block 485) failed 3[ 218.431432] FAT-fs (sda): Directory bread(block 486) failed 3[ 218.431444] FAT-fs (sda): Directory bread(block 487) failed 3[ 218.431466] FAT-fs (sda): Directory bread(block 488) failed 3[ 218.431478] FAT-fs (sda): Directory bread(block 489) failed 3[ 218.431499] FAT-fs (sda): Directory bread(block 490) failed 3[ 218.431515] FAT-fs (sda): Directory bread(block 491) failed 3[ 218.431528] FAT-fs (sda): Directory bread(block 492) failed 3[ 218.431540] FAT-fs (sda): Directory bread(block 493) failed 3[ 218.431551] FAT-fs (sda): Directory bread(block 494) failed 3[ 218.431563] FAT-fs (sda): Directory bread(block 495) failed 3[ 218.431592] FAT-fs (sda): Directory bread(block 496) failed 3[ 218.431604] FAT-fs (sda): Directory bread(block 497) failed 3[ 218.431616] FAT-fs (sda): Directory bread(block 498) failed 3[ 218.431627] FAT-fs (sda): Directory bread(block 499) is this probably issue in driver where It is failing to properly re-init the USB device 2nd time ? I have no idea, something is trying to read those blocks and failing, perhaps a program doesn't realize the disk is no longer there anymore? greg k-h ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Unsuccessful transactions during usb enumeration
OK ! So USB Driver is trying to read but physically disk is not enumerated but USB Subsystem did recognize the disk as per Logs. usb 2-1.1: new high speed USB device number 6 using fsl-ehci 6[ 216.990681] scsi1 : usb-storage 2-1.1:1.0 5[ 217.983182] scsi 1:0:0:0: Direct-Access USB2.0Flash Disk 0.00 PQ: 0 ANSI: 2 5[ 217.986978] sd 1:0:0:0: [sdb] 3904512 512-byte logical blocks: (1.99 GB/1.86 GiB) 5[ 217.987461] sd 1:0:0:0: [sdb] Write Protect is off 7[ 217.987473] sd 1:0:0:0: [sdb] Mode Sense: 00 00 00 00 3[ 217.987958] sd 1:0:0:0: [sdb] Asking for cache data failed 3[ 217.987968] sd 1:0:0:0: [sdb] Assuming drive cache: write through 3[ 217.991715] sd 1:0:0:0: [sdb] Asking for cache data failed 3[ 217.991726] sd 1:0:0:0: [sdb] Assuming drive cache: write through 6[ 218.215499] sdb: 3[ 218.221482] sd 1:0:0:0: [sdb] Asking for cache data failed 3[ 218.221513] sd 1:0:0:0: [sdb] Assuming drive cache: write through 5[ 218.221529] sd 1:0:0:0: [sdb] Attached SCSI removable disk 3[ 218.431346] FAT-fs (sda): Directory bread(block 480) failed 3[ 218.431362] FAT-fs (sda): Directory bread(block 481) failed 3[ 218.431374] FAT-fs (sda): Directory bread(block 482) failed 3[ 218.431386] FAT-fs (sda): Directory bread(block 483) failed Regards Sanjeev Sharma On Wed, Jun 18, 2014 at 12:37 PM, Greg KH g...@kroah.com wrote: On Wed, Jun 18, 2014 at 12:22:33PM +0530, sanjeev sharma wrote: Hi Greg, In one of my imx6 based Board when I connect USB Disk first time everything work's ok and I can read/write content from USB Flash Driver but when I do eject and connect again I could see below continuous messages from dmesg and disk never mounted. 218.431346] FAT-fs (sda): Directory bread(block 480) failed 3[ 218.431362] FAT-fs (sda): Directory bread(block 481) failed 3[ 218.431374] FAT-fs (sda): Directory bread(block 482) failed 3[ 218.431386] FAT-fs (sda): Directory bread(block 483) failed 3[ 218.431398] FAT-fs (sda): Directory bread(block 484) failed 3[ 218.431420] FAT-fs (sda): Directory bread(block 485) failed 3[ 218.431432] FAT-fs (sda): Directory bread(block 486) failed 3[ 218.431444] FAT-fs (sda): Directory bread(block 487) failed 3[ 218.431466] FAT-fs (sda): Directory bread(block 488) failed 3[ 218.431478] FAT-fs (sda): Directory bread(block 489) failed 3[ 218.431499] FAT-fs (sda): Directory bread(block 490) failed 3[ 218.431515] FAT-fs (sda): Directory bread(block 491) failed 3[ 218.431528] FAT-fs (sda): Directory bread(block 492) failed 3[ 218.431540] FAT-fs (sda): Directory bread(block 493) failed 3[ 218.431551] FAT-fs (sda): Directory bread(block 494) failed 3[ 218.431563] FAT-fs (sda): Directory bread(block 495) failed 3[ 218.431592] FAT-fs (sda): Directory bread(block 496) failed 3[ 218.431604] FAT-fs (sda): Directory bread(block 497) failed 3[ 218.431616] FAT-fs (sda): Directory bread(block 498) failed 3[ 218.431627] FAT-fs (sda): Directory bread(block 499) is this probably issue in driver where It is failing to properly re-init the USB device 2nd time ? I have no idea, something is trying to read those blocks and failing, perhaps a program doesn't realize the disk is no longer there anymore? greg k-h ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Eudyptula Challenge Task 01
So Thunderbird client can work out of Box to submit Assignment We can also attach .c .h files too if required against the Assignment. Regards Sanjeev Sharma On Sun, Jun 15, 2014 at 2:57 PM, Abhishek Sharma asharma...@gmail.com wrote: On 13-06-2014 AM 04:10, Nada Saif wrote: Hi, Which email client is best to submit tasks . I use gmail , and I get a problem with attachment base64!? What you suggest me to use! Regards, N.G Thunderbird Regards, Abhishek Sharma On Tue, Apr 29, 2014 at 6:34 PM, Pranay Srivastava pran...@gmail.com wrote: On Tue, Apr 29, 2014 at 8:40 PM, me storage me.storage...@gmail.com wrote: Hi i every one i am new to linux kernel programming .I am participating in Eudyptula Challenge .Recently i submitted my solutions to Task 01 but i gives me reply like the below Please read the requirements for the Makefile and allow the module to be built against any kernel source tree on the filesystem, not just those kernels that happened to be installed in /lib/ at some point in time. And my make file is like this ifneq ($(KERNELRELEASE),) obj-m += helloworld.o else default I hope you understand the -C switch : make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/bulid M=$(PWD) clean end If not then find it out and see what you need to change. So can any please tell me how to allow the module to be built against any kernel source tree on the filesystem? or can any one pleae tell me what does it mean? Thank you ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- ---P.K.S ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
out-of-tree configuration
I am working with a kernel module that has a few kconfig options associated with it. The makefile for the module as it is does not support out-of-tree builds. I am trying to change the the makefile to do out-of-tree builds. Most of this is pretty straight forward, however I can't seem to find any recomendations on to do local configurations for just the out of tree build. right now I use the code below, but I don't realy think it is a good solution because of the possible confilict between the local .config file and the kernel .config file. Any suggestions on how I should handle this? ifneq ($(KERNELRELEASE),) # kbuild part of makefile # Optionally, include config file to allow out of tree kernel modules build -include $(src)/.config # Core module obj-$(CONFIG_XXX) += xxx.o xxx-y += xxx-core.o xxx-sysfs.o # drivers obj-$(CONFIG_XXX_1)+= xxx1.o obj-$(CONFIG_XXX_2)+= xxx2.o else # normal makefile KDIR ?= /lib/modules/`uname -r`/build default: .config $(MAKE) -C $(KDIR) M=$$PWD modules .config: @echo need local .config exit 1 modules_install: $(MAKE) -C $(KDIR) M=$$PWD modules_install clean: rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions \ modules.order Module.symvers endif ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: out-of-tree configuration
On 18 June 2014 15:03, John Bougs bogusemail98...@yahoo.com wrote: I am working with a kernel module that has a few kconfig options associated with it. The makefile for the module as it is does not support out-of-tree builds. I am trying to change the the makefile to do out-of-tree builds. First, why do you want to build the module out-of-tree? For 3rd party modules I can understand that need, OTOH, in that case your question wouldn't have existed. Cheers, Anders -- Anders Darander EPO guidelines 1978: If the contribution to the known art resides solely in a computer program then the subject matter is not patentable in whatever manner it may be presented in the claims. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: out-of-tree configuration
On Wednesday, June 18, 2014 6:47 AM, Anders Darander anders.daran...@gmail.com wrote: On 18 June 2014 15:03, John Bougs bogusemail98...@yahoo.com wrote: I am working with a kernel module that has a few kconfig options associated with it. The makefile for the module as it is does not support out-of-tree builds. I am trying to change the the makefile to do out-of-tree builds. First, why do you want to build the module out-of-tree? For 3rd party modules I can understand that need, OTOH, in that case your question wouldn't have existed. I am working with a third party module that I am building out of tree. I trying this across multiple platforms. I am placing the module code in our VCS... out of tree seems to be a cleaner, simpler, les complicated solution to me. Without trying to sound confrontational, why not build it out of tree?___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: out-of-tree configuration
On Wed, 18 Jun 2014 07:02:09 -0700, john bougs said: Without trying to sound confrontational, why not build it out of tree? Why not have it build in-tree? That way you can throw it at Greg KH and get it in (at least) drivers/staging, at which point you no longer have to do ongoing maintenance to keep in sync with new kernel APIs - if anybody changes an API that you're using, it's their job to update your use of it. :) pgpySZVLwLHKo.pgp Description: PGP signature ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: out-of-tree configuration
On 18 Jun 2014 16:02, john bougs bogusemail98...@yahoo.com wrote: On Wednesday, June 18, 2014 6:47 AM, Anders Darander anders.daran...@gmail.com wrote: On 18 June 2014 15:03, John Bougs bogusemail98...@yahoo.com wrote: I am working with a kernel module that has a few kconfig options associated with it. The makefile for the module as it is does not support out-of-tree builds. I am trying to change the the makefile to do out-of-tree builds. First, why do you want to build the module out-of-tree? For 3rd party modules I can understand that need, OTOH, in that case your question wouldn't have existed. I am working with a third party module that I am building out of tree. I trying this across multiple platforms. I am placing the module code in our VCS... out of tree seems to be a cleaner, simpler, les complicated solution to me. Well, from your first email, I got the impression that you tried to move an in-tree module out of the kernel tree. What 3rd party module is it that you're building, that is delivered to you in a state to only allow in-tree builds? That's a pretty uncommon situation. Are the config options you need to be set something that only this module knows about, or are they something the rest of the kernel knows about? Without trying to sound confrontational, why not build it out of tree? Well, there's nothing wrong to build a true 3rd party module out-of-tree. It might very well be your only choice due to a number of factors. Though, if you can get it upstreamed, you'll win in the long term. Cheers, Anders ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: out-of-tree configuration
On Wednesday, June 18, 2014 7:31 AM, Anders Darander anders.daran...@gmail.com wrote: Well, from your first email, I got the impression that you tried to move an in-tree module out of the kernel tree. What 3rd party module is it that you're building, that is delivered to you in a state to only allow in-tree builds? That's a pretty uncommon situation. Are the config options you need to be set something that only this module knows about, or are they something the rest of the kernel knows about? Without trying to sound confrontational, why not build it out of tree? Well, there's nothing wrong to build a true 3rd party module out-of-tree. It might very well be your only choice due to a number of factors. Though, if you can get it upstreamed, you'll win in the long term. Cheers, Anders I'm playing with a module off of github - fbtft. All the config is local to the module. Thanks Well, from your first email, I got the impression that you tried to move an in-tree module out of the kernel tree. What 3rd party module is it that you're building, that is delivered to you in a state to only allow in-tree builds? That's a pretty uncommon situation. Are the config options you need to be set something that only this module knows about, or are they something the rest of the kernel knows about? Without trying to sound confrontational, why not build it out of tree? Well, there's nothing wrong to build a true 3rd party module out-of-tree. It might very well be your only choice due to a number of factors. Though, if you can get it upstreamed, you'll win in the long term. Cheers, Anders ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Eudyptula Challenge Task 01
Hi Sanjeev, Please share the steps to configure Thunderbird so that it benefits all of us. -Anand Moon On Wednesday, June 18, 2014 4:37 PM, sanjeev sharma sanjeevsharmae...@gmail.com wrote: So Thunderbird client can work out of Box to submit Assignment We can also attach .c .h files too if required against the Assignment. Regards Sanjeev Sharma On Sun, Jun 15, 2014 at 2:57 PM, Abhishek Sharma asharma...@gmail.com wrote: On 13-06-2014 AM 04:10, Nada Saif wrote: Hi, Which email client is best to submit tasks . I use gmail , and I get a problem with attachment base64!? What you suggest me to use! Regards, N.G Thunderbird Regards, Abhishek Sharma On Tue, Apr 29, 2014 at 6:34 PM, Pranay Srivastava pran...@gmail.com wrote: On Tue, Apr 29, 2014 at 8:40 PM, me storage me.storage...@gmail.com wrote: Hi i every one i am new to linux kernel programming .I am participating in Eudyptula Challenge .Recently i submitted my solutions to Task 01 but i gives me reply like the below Please read the requirements for the Makefile and allow the module to be built against any kernel source tree on the filesystem, not just those kernels that happened to be installed in /lib/ at some point in time. And my make file is like this ifneq ($(KERNELRELEASE),) obj-m += helloworld.o else default I hope you understand the -C switch : make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/bulid M=$(PWD) clean end If not then find it out and see what you need to change. So can any please tell me how to allow the module to be built against any kernel source tree on the filesystem? or can any one pleae tell me what does it mean? Thank you ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- ---P.K.S ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Eudyptula Challenge Task 01
On Wed, 18 Jun 2014 10:43:42 -0700, Anand Moon said: Hi Sanjeev, Please share the steps to configure Thunderbird so that it benefits all of us. % grep -i thunder /usr/src/linux-next/Documentation/email-clients.txt Thunderbird (GUI) Thunderbird is an Outlook clone that likes to mangle text, but there are ways The easiest thing to do with Thunderbird and patches is to use an - Edit your Thunderbird config settings so that it won't use format=flowed. thunderbird's registry editor. If you're doing the challenge, you have the info already in your source tree pgppHZJlagpG4.pgp Description: PGP signature ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Why the page tables are needed for lowmem?
On Thu, Jun 19, 2014 at 8:51 AM, sandeep kumar coolsandyfor...@gmail.com wrote: Hi All i was going through mm initialization code, and saw paging_init() implementation. it has a function map_lowmem(). I was wondering why do we need page table entries for lowmem ?? I hope you understand how MMU and virtual memory works. because all the pages in lowmem can be addressed by kernel logical address and differ only an offset from the physical address. Why cant we simply add that offset to the virtual(logical) address and get the job done. Why waste some memory for creating PTEs for them? Let's forget about lowmem or high mem. See the role of MMU and you'll understand why it's needed. can any one clarify? -- With regards, Sandeep Kumar Anantapalli, ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- ---P.K.S ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
