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

Re: [Celinux-dev] [Q] TinyLinux project status (resend)
by Ezequiel García April 24, 2012

April 24, 2012

> > Yes, to my understanding ucLinux was merged into vanilla Linux during > 2.6 development, but it was the options hidden under a global flag. > These flags would enable remove MMU and other parts. Confirm? > I tried that on a 5282 mmu-less board, so... confirmed to the best of my knowledge :) Regards, Ezequiel.

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Re: [Celinux-dev] [Q] TinyLinux project status (resend)
by Ezequiel García April 24, 2012

April 24, 2012

Hi, 2012/4/24 Gustavo Sverzut Barbieri <barbieri(a)profusion.mobi>: >> It seems Linux is not aiming that low after all, however a little >> effort to try to un-bloat the current >> state of things can't hurt, right? > > Do you know the state of uCLinux, when those options are enabled it > should be better, no? Or 1.5Mb is with such options? To avoid confusion: uclinux is basically a linux distribution; it is made of a linux kernel and a filesystem. The kernel included in latest uclinux distribution file is 3.x series, and it is pretty much equally to a vanilla kernel (as compiled from git). So, when compiling for m68k (coldfire) with just the bare minimum options enabled: block layer, console drivers, romfs, I got a 1.5 MB kernel. I was shocked by the bigness of the number, but it doesn't seem to be easily reduced. And we are not even talking about dynamic footprint, or filesystem requirements!

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Re: [Celinux-dev] [Q] TinyLinux project status (resend)
by Ezequiel García April 24, 2012

April 24, 2012

Hi, > > Linux in under 2 megabytes of RAM, even when running from ROM, is not a > realistic goal. For context: linux 0.0.1 was developed on a 4 megabyte > system in 1991. Swap support was added in december of that year so it > could run on a 2 megabyte system. > After some research I came to the same conclusion. I guess I was on drugs when I tought that, since even a kernel compiled with almost nothing (not even BUG support) weights ~1.5 MB. It seems Linux is not aiming that low after all, however a little effort to try to un-bloat the current state of things can't hurt, right? Thanks, Ezequiel.

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kerneloops.org
by Peter Senna Tschudin April 24, 2012

April 24, 2012

Hi, Is someone working on a replacement for kerneloops.org? Is working on a replacement something welcome? Peter -- Peter Senna Tschudin peter.senna(a)gmail.com gpg id: 48274C36

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Write-up on a I2C driver issue
by Arun KS April 24, 2012

April 24, 2012

Hello Everyone, I have a short wirte up on I2C driver. For the newbiews it will give lot of information. For the experienced, if time permits, please read and point out my mistakes. Here come the link, http://www.hackers4hackers.blogspot.in/2012/03/real-life-picture-of-i2c.html Thanks, Arun

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Svn Error
by Madhav Mohan April 23, 2012

April 23, 2012

Hi Guys I have just started learning about the tools to start contributing to open source. I had installed svn through apt get in ubuntu 10.10 but when I try to commit anything to the repository i get this error Error: Commit failed (details follow): Error: Commit blocked by pre-commit hook (exit code 1) with output: Please could anyone help me to resolve this. Thanks and Regards Madhav Mohan Bachelor Of Technology In Information Technology National Institute Of Technology,Surathkal,Karnataka

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Open to work for any kernel module
by Anil Varma Biruduraju April 23, 2012

April 23, 2012

Hi All, Please let me know if I can start working on some kernel modules. Thank you. Regards, Anil Varma B.

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Linux code quality
by Ezequiel García April 20, 2012

April 20, 2012

Off-topic, perhaps not relevant... need to throw this out me :) Why do I have to hear that linux code is not well written? Having seen lots of other projects, it seems very neat to me. Actually, it is one of the main reasons that makes me want to learn, help, etc. Thanks, Ezequiel.

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Node creation For real time devices
by manty kuma April 20, 2012

April 20, 2012

Hi, I want to know how a node is created when a hardware is connected to the system. Information that I know : *When a hardware is connected to the system, the device name is compared with the driver name, if it matches, then probe is called.* * * Info i wish to know: *At which point is the node created and who is creating it(In other words, i want to know where is mknod happening)?* * * This one thing is bugging my mind from so many months. Please tell me programatically where is this happening. I will be very thankful. Best Regards, Manty.

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Re: 32 bit kernel on 64 bit machine
by Graeme Russ April 20, 2012

April 20, 2012

Hi Krishna, Please keep ML Cc'd On Fri, Apr 20, 2012 at 1:57 PM, er krishna <erkrishna(a)gmail.com> wrote: > Graeme, > > Thanks for the reply. > > On Fri, Apr 20, 2012 at 11:49 AM, Graeme Russ <graeme.russ(a)gmail.com> wrote: >> >> Hi Krishna, >> >> On Fri, Apr 20, 2012 at 1:45 PM, er krishna <erkrishna(a)gmail.com> wrote: >> > Hi All, >> > >> > Is it possible to boot the 64 bit machine through 32 bit compiled kernel >> > ? I >> >> Yes > > > How ? What are the exact steps ? I mean how I will compile the kernel (flags > and all) that will boot on 64 bit processor ? My problem is I have 64 bit > fc16 and Sandybridge 64 bit machine. I need to compile the kernel for 32 bit > with these setup and boot it. The steps you performed I believe will have built a 32-bit kernel >> > tried its compilation on fedora 16 64 bit and intel sandybridge 64 bit >> > with >> > following option: >> > >> > >> > $ make ARCH=i386 menuconfig >> > >> > $ make ARCH=i386 –j4 >> > >> > >> > but it failed to boot. Any suggestion if it can be done by any way. >> >> You cannot use a 32-bit kernel with 64-bit user-space >> > > Sorry, I didn't get you here. Do you mean to say that 64 bit application > won't work on 32 bit kernel. if its then its fine. Yes, that is what I mean't - If all you userspace (libraries, applications etc) are 64-bit then a 32-bit kernel cannot run them. You should have at least got a kernel panic that init could not be run By 'fine' you mean that your setup is fine and you tried to run the 32-bit kernel using 32-bit userspace? If so, there is obviously another problem. Regards, Graeme

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