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how to compile additional module?
by loody Aug. 23, 2011

Aug. 23, 2011

Dear all: I make a module under kernel tree and adding Kconfig for that. But I have no idea where I should add that when I type "make modules", the modules I add will be compiled. Would anyone tell me where the modules list located? -- Regards,

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Re: Headset driver detection problem during bootup
by anish singh Aug. 23, 2011

Aug. 23, 2011

adding more information and experts on alsa. On Fri, Aug 19, 2011 at 9:23 PM, anish singh <anish198519851985(a)gmail.com> wrote: > I need some suggestions for below situation: > > Headset if it is inserted before the device is powered up is > now detected by forcefully calling the interrupt handler in > the probe function of the headset driver. Headset is detected in our andorid device by using a detect gpio which is turned on when headset is inserted.If the headset is inserted right from very beginging i.e. before device is even turned on then we forcefully call the handler and thereby in handler we check if gpio is turned on or not and do the rest of things. > Once the handler is called then we find out if the headset > is there or not using gpio and then normal detection happens > > Is it the right way to detect the device during power-up? Does not linux have any other way of doing this which i may be missing? How this is handled in the case of ALSA jack i.e. the jack drivers which is using alsa framework for detection? Android doesn't use ALSA framework for reporting JACK. > > After the device is powered up and then if we insert headset > then it is working fine by calling the interrupt handler and > everything goes fine. > > linux -2.3.5 > Android Device >

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Running code on an isolated core
by Vaibhav Jain Aug. 23, 2011

Aug. 23, 2011

Hi, I am looking into running a program on one of the cores which is isolated (logically offline ) from the rest of the cores. I have come to that the command echo 0 > /sys/device/system/cpu/<core num>/online will make a core logically offline, What I need to do now is to run a program on this offline core. Please suggest on how to proceed. Thanks! Vaibhav Jain

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[ Kernel not booting up ]
by ashish raste Aug. 23, 2011

Aug. 23, 2011

Hi all, Recently I compiled and tried installing kernel (2.6.39.3), which I downloaded from kernel.org All the activity that I did was to copy the .config file of my distro (Ubuntu 10.10), then the following commands : - make menuconfig ( I exited, keeping the default configuration ) - make modules - make install_modules - make install - update grub All of the above commands got executed without any errors, and the new kernel version was also shown in the grub menu. But it showed some errors and didn't login. When I tried logging to my Ubuntu distro, a blue login box(which is normally violet in color) appeared. After giving password, it came back again to the same screen without going inside. Only thing I was able to do was to dropping in root mode (from Ubuntu's recovery mode u\in the grub menu) and looking at all of my data through terminal without a GUI. Can anyone tell how can I recover my compiled kernel and distro's kernel? Thankyou. -- ~Cheers!! Ashish Raste Anyone who has never made a mistake has never tried anything new. -Sir Albert Einstein

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question in request_threaded_irq
by radhika bhaskaran Aug. 23, 2011

Aug. 23, 2011

Hi, I have a question with respect to request_threaded_irq. Assume that one driver has registered and ISR on some particular irq number. Can i use the same irq number and register and isr in another driver. Because that is my requirement. when i try to do that is an error message with an error no as -19. err = request_threaded_irq(pdata->irq , NULL, testing_fucntion, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "testing_function", dev); Can some one please help me whether it is possible. Regards, RB

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Can i allocate 4GB virtual addresses (more than a certain limit) using vmalloc?
by sandeep kumar Aug. 22, 2011

Aug. 22, 2011

Hi all, The following link gives the memory map for the arm architecture. http://www.arm.linux.org.uk/developer/memory.txt I have the following doubts.. 1) Any chipset(based on arm) manufacturer(qualcom,samsung..) should follow the same memory map. Is it hardly constrained or can be changed? Where are this constraints are implemented in the kernel source tree? 2) while i was student, i read in OS concepts that, "Virtual memory gives an illusion to a process, that it has always a larger continuous address space (even more than RAM) available to it." So i thought i could allocate howmuch ever memory i want. But seeing the above link,i observed there is some limitation in the address space created by the vmalloc(). So i m now thinking that vmalloc has some limit. Please make me clear these things.... With regards, Sandeep Kumar Anantapalli,

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How to find out if the NIC supports SR-IOV
by C K Kashyap Aug. 22, 2011

Aug. 22, 2011

Hi, I am working with a westemere based server. I need to find out if the NIC installed there supports SR-IOV - what would be the best way to determine that? Regards, Kashyap hwconfig ------------- Summary: HP DL160 G6, 2 x Xeon E5620 2.40GHz, 15.7GB / 16GB 1333MHz, 1 x 500GB SATA System: HP ProLiant DL160 G6, C-2N/16/500, ySPEC 25.0 Processors: 2 x Xeon E5620 2.40GHz (HT enabled, 8 cores, 16 threads) - Gulftown B1, 64-bit, quad-core, 32nm, L3: 12MB Memory: 15.7GB / 16GB 1333MHz == 4 x 4GB - 4GB PC3-10600 Hynix DDR3-1333 ECC Registered CL9 1Rx4 14 x empty Disk: sda (ahci0): 500GB (1%) JBOD == 1 x 500GB 7.2K SATA/300 HP/WD RE4 Disk-Control: ahci0: HP/Intel ICH10 82801J 6 Port SATA/300 AHCI Chipset: Intel 5520 IOH-36D B3 (Tylersburg), 82801JIR A0 (ICH10R) Network: eth0 (igb): HP NC362i/Intel 82576 Gigabit, 1Gb/s <full-duplex> Network: eth1 (igb): HP NC362i/Intel 82576 Gigabit, no carrier OS: YLinux 5.4.3, RHEL Server 5.4, Linux 2.6.18-164.2.1.el5 x86_64, 64-bit BIOS: HP O33 08/16/2010, rev 8.15 lspci shows this - 05:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01) Subsystem: Hewlett-Packard Company NC362i Integrated Dual port Gigabit Server Adapter Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0, Cache Line Size: 256 bytes Interrupt: pin A routed to IRQ 82 Region 0: Memory at fbe60000 (32-bit, non-prefetchable) [size=128K] Region 1: Memory at fbe40000 (32-bit, non-prefetchable) [size=128K] Region 2: I/O ports at e880 [size=32] Region 3: Memory at fbeb8000 (32-bit, non-prefetchable) [size=16K] Expansion ROM at fbe20000 [disabled] [size=128K] Capabilities: [40] Power Management version 3 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=1 PME- Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable- Address: 0000000000000000 Data: 0000 Capabilities: [70] MSI-X: Enable+ Mask- TabSize=10 Vector table: BAR=3 offset=00000000 PBA: BAR=3 offset=00002000 Capabilities: [a0] Express Endpoint IRQ 0 Device: Supported: MaxPayload 512 bytes, PhantFunc 0, ExtTag- Device: Latency L0s <512ns, L1 <64us Device: AtnBtn- AtnInd- PwrInd- Device: Errors: Correctable- Non-Fatal+ Fatal+ Unsupported- Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ Device: MaxPayload 256 bytes, MaxReadReq 4096 bytes Link: Supported Speed 2.5Gb/s, Width x4, ASPM L0s L1, Port 2 Link: Latency L0s <4us, L1 <64us

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How to get the physical address of memory allocated by kmalloc
by subin gangadharan Aug. 22, 2011

Aug. 22, 2011

Hi All, Is there any API exists in kernel to get the physical address of the memory allocated by kmalloc.Can I use virt_to_phys for this ? With Regards Subin Gangadharan Everything should be made as simple as possible,but not simpler.

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Reading debug/tracing info
by Prateek Sharma Aug. 21, 2011

Aug. 21, 2011

Hello all, I am learning how to add static trace points via trace_events. I am seeing the trace using 'cat /sys/kernel/debug/tracing/trace' . Naturally the tracing buffer size is limited. My question is, what is the recommended way of reading trace data? Ive looked at perf record/report, but so far, i have only managed to get aggregated statistics, or complete dumps. What i need is just a way to collect all the trace output to one file. Basically i am using the trace events as a souped up printk (since i need to collect large amounts of traces). Do i need to use LTTng/viewer or something for this task? Thanks!

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getting started
by Littlefield, Tyler Aug. 20, 2011

Aug. 20, 2011

Hello all: I'd like to get going working on the kernel (I've tried getting started the last few times). On the kernelnewbies page, one of the kernel janitor projects is to balance out functions and clean up code. I'm curious if there would be someone, or a group of someone's who would mind assigning me a specific file or a small driver of some sort that needs this so I can get started helping out? -- Take care, Ty my website: http://tds-solutions.net my blog: http://tds-solutions.net/blog skype: st8amnd127 My programs don't have bugs; they're randomly added features!

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