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Send/receive ATA cmds from a linux kernel module
by Siddhartha Baral Feb. 2, 2017

Feb. 2, 2017

Hi All, I am trying to write a linux kernel module which can send/receive ATA SMART cmds to a HDD. The kernel module will take a set of actions based on the responses it receives from the HDD. I went through the ATA smart cmds spec and the "smartctl" user space code which sends the ATA cmds from user space via SG_IO ioctl cmd. I am not able to figure out how to open /dev/sda from kernel and achieve similar functionalities line "smartctl" tool from a kernel module. 1. Can someone point me to any sample code which tries to send ATA smart cmds from a kernel module instead of user space via ioctl? 2. Seems like I need to use some exported API from SG driver or libata. is this the right direction? 3. Please feel free to suggest how can I achieve this. Thanks, Sid

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A bit of quilt
by Amit Kumar Feb. 2, 2017

Feb. 2, 2017

Hi, As I know quilt is used by maintainers. But kernel source code is maintained in git repo. So I want to know how git and quilt work together. In mutt I have seen that a mail sent by Mr. GregKH has quilt mail as user agent and git-send-email as x-mailer. It means he is using git-send-email as a backend for quilt mail. Last but not least, I think if a developer starts using quilt to maintain his diferent versions of a patch, it will ease a maintainer job. Regards, Amit Kumar

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Which repository to clone ?
by srishti sharma Feb. 2, 2017

Feb. 2, 2017

Hey, I am an absolute newbie , I tried to clone greg kroah-hartman's staging tree repository , somehow I was not able to boot in the kernel I built . Also, Does this command below give me the latest kernel code ? I have tried to clone another repository using the command below git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git while building with this , I had to install gcc plugin-dev . I don't understand why ? I didn't have to do it last time I built the kernel Regards

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Re: Which repository to clone ?
by srishti sharma Feb. 2, 2017

Feb. 2, 2017

Also my compiler is saying things like , cyclomatic complexity followed by (i think) the parts it is compiling like driver names . Also it has been two hours since it started compiling and it isn't done yet . Is it because I ran $make instead $make -jx ? It was by mistake . On Thu, Feb 2, 2017 at 5:28 AM, srishti sharma <srishtishar(a)gmail.com> wrote: > Thanks, I am running ubuntu 16.04 LTS > > On Thu, Feb 2, 2017 at 5:17 AM, Amit Kumar <free.amit.kumar(a)gmail.com> wrote: >> On Thu, Feb 02, 2017 at 03:39:18AM +0530, srishti sharma wrote: >>> Hey, >>> I am an absolute newbie , I tried to clone greg kroah-hartman's >>> staging tree repository , somehow I was not able to boot in the kernel >>> I built . >>> >>> Also, Does this command below give me the latest kernel code ? >>> >>> I have tried to clone another repository using the command below >>> >>> git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git >>> >>> >>> while building with this , I had to install gcc plugin-dev . I don't >>> understand why ? >>> I didn't have to do it last time I built the kernel >> You may use this link, >> https://www.kernel.org/doc/man-pages/linux-next.html >> In summary, first you clone main upstream tree then add linux-next tree. >> Whenever you want to create a patch, create a topic branch from the >> latest next-* tag. >> >> Regards, >> Amit Kumar >>> >>> Regards >>> >>> _______________________________________________ >>> Kernelnewbies mailing list >>> Kernelnewbies(a)kernelnewbies.org >>> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

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Re: Which repository to clone ?
by Lino Sanfilippo Feb. 1, 2017

Feb. 1, 2017

On 02.02.2017 00:38, srishti sharma wrote: > Thanks for replying , > Does the one I cloned give me 2.6 kernel version , is this not being > developed now ? > Also why did I need to use gcc plugin-devs ? > Regards > Yes, the one you tried is the (very old) 2.6 kernel. I dont know why you would have to install the plugin-devs. Which distro are you running? Regards, Lino

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MMCBLK CMD17/18 read data
by Amit Mahadik Feb. 1, 2017

Feb. 1, 2017

Hello, I want to interface MMC card via SPI bus. However, I am getting CRC errors for CMD18. I tried reading partition table using CMD17 but still get errors. The same SDMMC card gets detected using SD interface. I want to compare the data of CMD18/CMD17 of SD and SPI modes. Please let me know how can I print the read data of the said commands in the block layer? I tried using the following code but it didn't help sg_copy_to_buffer(brq->data.sg, brq->data.sg_len, buf, 4096); and printed buf. Regards, Amit.

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Re: How do you generate the config file?
by Abel Jan. 31, 2017

Jan. 31, 2017

I've posted a mail with the screenshot (waiting for moderation) when I try to boot from make defconfig built kernel. Basically the kernel doesn't boot because "Missing modules (cat /proc/modules; ls /dev " it says...It's the same screen that appeared when I tried using make oldconfig pressing enter for default values. I tried using make localmodconfig but It again asks for many config params that I don't know anything about. Saludos, * Abel.* On 30 January 2017 at 01:11, Abel <akronix5(a)gmail.com> wrote: > Hi. > > I just built using make defconfig and it, again, doesn't boot. Instead it > displays the error that I've described before (sorry I forgot to attach the > screenshot, I attach it here). > > As I already stated, neither /boot/${uname -r} nor make oldconfig work for > me, they both show the screen above. > > Saludos, > > * Abel.* > > On 30 January 2017 at 01:08, Guru Das S <gurooodas(a)gmail.com> wrote: > >> On 29 January 2017 at 15:32, 慕冬亮 <mudongliangabcd(a)gmail.com> wrote: >> > Hello, >> > If you want to reuse the config of current kernel, you can use >> > `make oldconfig` to generate config file. >> > >> > -- >> > My best regards to you. >> > >> > No System Is Safe! >> > Dongliang Mu >> > >> > 2017-01-29 18:24 GMT-05:00 Ozgur Karatas <mueddib(a)goosey.org>: >> >> >> >> Hello, >> >> >> >> you can get .config files in two ways, firstly get the existing >> .config file >> >> and compile to kernel. >> >> >> >> $ cp /boot/config-x.x.x /bla/linux/.config >> >> >> >> Second, use the generate command: >> >> >> >> $ make defconfig >> >> >> >> Regards, >> >> >> >> ~Ozgur >> >> >> >> 30.01.2017, 01:18, "Abel" <akronix5(a)gmail.com>: >> >> >> >> Hi! >> >> >> >> Where do you get the config file from? or do you generate it yourself? >> >> >> >> I'm using xUbuntu 16.04 in a VM inside VMWare, following the >> instructions >> >> described in kernelnewbies wiki. (By the way, the download links to >> the iso >> >> images of Ubuntu don't work for me) >> >> >> >> If I copy the latest config file in /boot, kernel 4.4.0, it starts to >> ask me >> >> many config parameters that I don't know what to answer. I tried to >> press >> >> always <enter> to set up the default parameters, but after compiling I >> get >> >> an error trying to boot from that kernel (see atachment). >> >> >> >> I tried with make menuconfig and that seems to work, but it takes too >> long >> >> because it builds and includes many many drivers modules. >> >> Yeah, I know I could navigate through the ncurses window and select the >> >> stuff I want and deselect what I don't want, but I'd rather prefer >> just a >> >> simple config file that builds and works and don't waste time in >> >> understanding all the stuff that it's in there. >> >> >> >> So, isn't there a way to get a simple config file just to develop >> kernel >> >> stuff for an Ubuntu image? >> >> I've even gone to the kernel ppa sources for Ubuntu: >> >> http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9.5/; but it only >> provides >> >> a patch using the debian config files (which don't come from git >> sources of >> >> course). >> >> >> >> I just want a config file, copy it to the kernel root code and compile. >> >> >> >> Greetings, >> >> >> >> Abel >> >> >> >> >> >> _______________________________________________ >> >> Kernelnewbies mailing list >> >> Kernelnewbies(a)kernelnewbies.org >> >> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> >> > >> > _______________________________________________ >> > Kernelnewbies mailing list >> > Kernelnewbies(a)kernelnewbies.org >> > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> Hi Abel, >> >> To add to what Ozgur said, you may first copy the existing .config >> file that comes along with your Linux distribution to your kernel >> tree, and then use: >> >> $ make localmodconfig >> >> instead of defconfig. A quick Google search should tell you the >> differences between the two - and from what I've read, localmodconfig >> is preferred to defconfig. >> >> Hope this helps. >> >> >> Guru Das Srinagesh. >> > >

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spi - real protocols
by Ran Shalit Jan. 30, 2017

Jan. 30, 2017

Hello, As I understand word length in spi, defines the cs active time. It therefore seems that linux driver suits when dealing with simple spi protocols which keeps word size constant. How can we deal with spi protocols which use different spi size as part of protocol. for example cs need to be active for sending spi word - 9 bits, and then reading spi - 8 bit word (only after write+read spi changes values back to non active), How can we implement that ? Do we need to set bits_per_word size for the sending and then another bits_per_word for the receiving ? Regards, Ran

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How do you generate the config file?
by Abel Jan. 30, 2017

Jan. 30, 2017

Hi! Where do you get the config file from? or do you generate it yourself? I'm using xUbuntu 16.04 in a VM inside VMWare, following the instructions described in kernelnewbies wiki <https://kernelnewbies.org/OutreachyfirstpatchAlt?action=show&redirect=OPWfi…>. (By the way, the download links to the iso images of Ubuntu don't work for me) If I copy the latest config file in /boot, kernel 4.4.0, it starts to ask me many config parameters that I don't know what to answer. I tried to press always <enter> to set up the default parameters, but after compiling I get an error trying to boot from that kernel (see atachment). I tried with make menuconfig and that seems to work, but it takes too long because it builds and includes many many drivers modules. Yeah, I know I could navigate through the ncurses window and select the stuff I want and deselect what I don't want, but I'd rather prefer just a simple config file that builds and works and don't waste time in understanding all the stuff that it's in there. So, isn't there a way to get a simple config file just to develop kernel stuff for an Ubuntu image? I've even gone to the kernel ppa sources for Ubuntu: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9.5/; but it only provides a patch using the debian config files (which don't come from git sources of course). I just want a config file, copy it to the kernel root code and compile. *Greetings,* * Abel.*

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Build error
by Amit Kumar Jan. 29, 2017

Jan. 29, 2017

Hi, For last several days when I build arm64/defconfig even against next-20170125, I get the following error. arch/arm64/crypto/crc32-arm64.c:1:0: error: unknown feature modifier ‘crc’ /* ^ make[1]: *** [arch/arm64/crypto/crc32-arm64.o] Error 1 make: *** [arch/arm64/crypto] Error 2 Regards, Amit Kumar

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