April 2014 - kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

linux firmware
by Anand Moon April 30, 2014

April 30, 2014

Hi All, What is the user of Linux firmware ? How are these firmware created for particular devices. -Anand Moon

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Re: Eudyptula Challenge Task 01
by Aaditya Gavandalkar April 29, 2014

April 29, 2014

You are compiling it against only the kernel installed on your system and not any in general as "build" directory is present with only installed kernel It is not present with any source tree which is not installed on your system Kind regards, Aaditya Gavandalkar

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a question about btfixupprep
by Chan Kim April 29, 2014

April 29, 2014

Hi, in arch/sparc/boot/Makefile, there is a rule below. $(obj)/btfix.S: $(obj)/btfixupprep vmlinux FORCE $(call if_changed,btfix) This makes btfix.S file using btfixupprep executable. and from the definition below, quiet_cmd_btfix = BTFIX $@ cmd_btfix = $(OBJDUMP) -x vmlinux | $(obj)/btfixupprep > $@ I can see to make the btfix.S, the make runs objdump -x vmlinux | btfixupprep > btfix.S What does btfixupprep do? maybe relocations? or function name substitution(for sub architecture)? Regards, Chan

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Re: [Kernel-BR] Re: [RFC] Only a.out QMAGIC format is working
by Geyslan Gregório Bem April 28, 2014

April 28, 2014

Andi, Em 28 de abril de 2014 00:23, Andi Kleen <andi(a)firstfloor.org> escreveu: > Geyslan Gregório Bem <geyslan(a)gmail.com> writes: > > > > There should be chance to fix it. > > > > I think it too. > > If it's randomization the following could help: > > echo 0 > /proc/sys/kernel/randomize_va_space > > Does it? > Nop. After this: $ echo 0 | sudo tee /proc/sys/kernel/randomize_va_space NMAGIC segfault and the others have been killed. > -Andi > > -- > ak(a)linux.intel.com -- Speaking for myself only > > -- > Você está recebendo esta mensagem porque se inscreveu no grupo "Kernel > Brasil" dos Grupos do Google. > Para cancelar inscrição nesse grupo e parar de receber e-mails dele, envie > um e-mail para kernel-br%2Bunsubscribe(a)googlegroups.com. > Para postar neste grupo, envie um e-mail para kernel-br(a)googlegroups.com. > Para ver esta discussão na web, acesse > https://groups.google.com/d/msgid/kernel-br/8738gym90x.fsf%40tassilo.jf.int… > . > Para obter mais opções, acesse https://groups.google.com/d/optout. > -- Regards, Geyslan G. Bem hackingbits.com

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Re: [Kernel-BR] Re: [RFC] Only a.out QMAGIC format is working
by Geyslan Gregório Bem April 28, 2014

April 28, 2014

Em 20 de abril de 2014 08:45, Pavel Machek <pavel(a)ucw.cz> escreveu: > On Sat 2014-04-19 13:37:27, Geyslan Gregório Bem wrote: > > Pavel, > > > > Thank you. > > > > Maintainers, is there some chance to fix it or a.out is really > > doomed? > > There should be chance to fix it. > > I think it too. > Do you have some idea when it stopped working? > But I have no clue when it stopped. > Pavel > -- > (english) http://www.livejournal.com/~pavelmachek > (cesky, pictures) > http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html > > -- > Você está recebendo esta mensagem porque se inscreveu no grupo "Kernel > Brasil" dos Grupos do Google. > Para cancelar inscrição nesse grupo e parar de receber e-mails dele, envie > um e-mail para kernel-br%2Bunsubscribe(a)googlegroups.com. > Para postar neste grupo, envie um e-mail para kernel-br(a)googlegroups.com. > Para ver esta discussão na web, acesse > https://groups.google.com/d/msgid/kernel-br/20140420114501.GA12135%40amd.pa… > . > Para obter mais opções, acesse https://groups.google.com/d/optout. > -- Regards, Geyslan G. Bem hackingbits.com

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how BTFIXUP_CALL is used..
by Chan Kim April 27, 2014

April 27, 2014

Hi, It's raining Suday afternoon in Korea where many people are in grief for the loss of their family members from the ferry accident last week. We have those victims and families in our thoughts and prayers.. Anyway, I have a question.. In file mm/memory.c (linux 3.3), in funrcion __pmd_alloc, I see a line below. pmd_t *new = pmd_alloc_one(mm, address); pmd_alloc_one is defined as below. #define pmd_alloc_one(mm, address) BTFIXUP_CALL(pmd_alloc_one)(mm, address) if I apply the BTFIXUP_CALL macro, (#define BTFIXUP_CALL(__name) ___f_##__name) it just becomes ___f_pmd_alloc_one which is defined in file arch/sparc/boot/btfix.S below. ----------- ... .global ___btfixup_end ___btfixup_end: ! Define undefined references .global ___f_flush_sig_insns ___f_flush_sig_insns: ... .global ___f_pmd_alloc_one ___f_pmd_alloc_one: ... --------------- which makes me think ___f_pmd_alloc_one is just an adress shared by many ___f_... functions. And I couldn't find ___f_pmd_alloc_one anywhere else. (no definition..) But actually, as I guessed, the pmd_alloc_one function is actually srmmu_pmd_alloc_one function. How is this done? I only know BTFIXUP.. thing is adjusting the functions for the correct subarchitecture but I can't understand how this is done. Could anyboy tell me how this is done? or any good reference? Thanks, Chan

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Buffer cache mechanism
by Satheesaran April 26, 2014

April 26, 2014

Hi All, I was reading through the text, "The Design of the Unix Operating System" - Maurice Bach While reading through the Buffer cache, I had the following query Buffer data structure, has Buffer header + pointer to data area + pointers for Buffer Management. Does this,"pointer to data area", corresponds to disk block or Logical Filesystem block ? I am confused about this. To add more, I am aware of the fact that disk block is of 512 bytes on the most of the hard disks and logical disk block size ( depending on filesystem ) is of 4k in size. what would be available in data area pointed in buffer ? Thanks, Satheesaran

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RE: Learning to write kernel modules
by Rahul Sharma April 25, 2014

April 25, 2014

Hi narendra, There are many books. What I feel to consider for hands on writing kernel modules yo can refer Linux Device Driver by JONATHAN CORBET, ALESSANDRO RUBINI & GREG KROAH-HARTMAN. Thanks, Rahul -----Original Message----- From: "Narendra Joshi" <narendraj9(a)gmail.com> Sent: ‎25/‎4/‎2014 8:14 PM To: "Kernelnewbies(a)kernelnewbies.org" <Kernelnewbies(a)kernelnewbies.org> Subject: Learning to write kernel modules Can someone suggest some resources for learning to write kernel modules for 3.x linux kernels? -- narendra _______________________________________________ Kernelnewbies mailing list Kernelnewbies(a)kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

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Where should I ask about USB Target code?
by Larry Martin April 25, 2014

April 25, 2014

I am developing a USB print capture device based on Gumstix Overo (TI OMAP) and the Gadget printer driver in Linaro 3.5.0 distribution. It looks like the distributed gadget driver may not be responding to USB Setup messages. I have used printk to verify that my data is correct when function composite_setup returns, but it does not appear on my Beagle 12 USB analyzer. I have not changed anything lower down than composite.c. Reading the code in usb/core is not helping much. I really want to trace the call stack from composite_setup back to the silicon, but cannot find where the .setup method of the composite driver is called. So my newbie question is, where do I go to find people who are into this part of the kernel and talk it over with them? Thanks, Larry

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Learning to write kernel modules
by Narendra Joshi April 25, 2014

April 25, 2014

Can someone suggest some resources for learning to write kernel modules for 3.x linux kernels? -- narendra

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