Hi everyone, Just to update you that I have found my problem ! The problem was, in fact, the "gpio_request" function which was every time failing and so the "gpio_to_irq" and "request_irq" functions. After some research and a reading of the gpio documentation (in case I would have missed something), I noticed a difference between my code and the other IMX27 boards : "imx27_soc_init();" !!!! A very very important function that I have forgotten ! And now, all is okay with "gpio_request" and so on ! So happy ! :D And thank you again, Matthias, for your help / advice :) Best regards, -- Mylène JOSSERAND Navocap Le 02/04/2013 11:45, Mylene Josserand a écrit : > Hi Matthias, > > > Le 30/03/2013 14:09, Matthias Brugger a écrit : >> >> El 27/03/2013 18:16, "Mylene Josserand"<Mylene.Josserand@xxxxxxxxxxx >> <mailto:Mylene.Josserand@xxxxxxxxxxx>> va escriure: >> > >> > Hi everyone, >> > >> > >> > I have a problem with gpio functions. >> > My kernel version is 3.8.2 and my SoC is a imX27 on a "home-made" board. >> > >> > First, when I boot, I had only the "Starting kernel..." message. >> > So I rebuild my kernel with CONFIG_DEBUG_KERNEL, CONFIG_DEBUG_LL and >> > CONFIG_EARLY_PRINTK. I have also add the line >> > "earlyprintk=console,UART0,115200" on the bootargs of my Barebox. >> > >> > With that, I can see more messages : >> > >> > [...] >> > Unable to handle kernel NULL pointer dereference at virtual address >> 0000002c >> > pgd = c0004000 >> > [0000002c] *pgd=00000000 >> > Internal error: Oops: 5 [#1] PREEMPT ARM >> > Modules linked in: >> > CPU: 0 Not tainted (3.8.2+ #4) >> > PC is at __gpio_to_irq+0x1c/0x44 >> > LR is at navocap_baseboard_init+0xd8/0x2c8 >> > pc : [<c01fd194>] lr : [<c04fd468>] psr: 60000053 >> > sp : c7835ef0 ip : 00000079 fp : c05a5628 >> > r10: c04f817c r9 : 00000000 r8 : c05a562c >> > r7 : c7834000 r6 : 00000004 r5 : c05158c4 r4 : c0578844 >> > r3 : 000005ac r2 : c05b0410 r1 : c7834000 r0 : 00000000 >> > Flags: nZCv IRQs on FIQs off Mode SVC_32 ISA ARM Segment kernel >> > Control: 0005317f Table: a0004000 DAC: 00000017 >> > Process swapper (pid: 1, stack limit = 0xc78341b8) >> > Stack: (0xc7835ef0 to 0xc7836000) >> > 5ee0: c05158c4 c04fd468 00000002 >> > 10009000 >> > 5f00: 10009fff 00000000 00000200 00000000 00000000 00000000 c05158c4 >> > c04fd348 >> > 5f20: c0578844 c04f819c c04d23dc c00087f8 00000003 00000003 c04d1b2c >> > c06bd6a0 >> > 5f40: 00000000 c0578844 c05158c4 00000004 0000008b c05a562c c0515898 >> > c04f6378 >> > 5f60: c05a5620 c04f62a0 00000003 00000003 c04f6378 c00403e0 00000000 >> > 00000000 >> > 5f80: c03cfee0 00000000 00000000 00000000 00000000 00000000 00000000 >> > c03cfeec >> > 5fa0: 00000000 00000000 c03cfee0 c00093b0 00000000 00000000 00000000 >> > 00000000 >> > 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 >> > 00000000 >> > 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00100000 >> > 000a1000 >> > [<c01fd194>] (__gpio_to_irq+0x1c/0x44) from [<c04fd468>] >> > (navocap_baseboard_init+0xd8/0x2c8) >> > [<c04fd468>] (navocap_baseboard_init+0xd8/0x2c8) from [<c04f819c>] >> > (customize_machine+0x20/0x30) >> > [<c04f819c>] (customize_machine+0x20/0x30) from [<c00087f8>] >> > (do_one_initcall+0x2c/0x168) >> > [<c00087f8>] (do_one_initcall+0x2c/0x168) from [<c04f62a0>] >> > (kernel_init_freeable+0xf4/0x1cc) >> > [<c04f62a0>] (kernel_init_freeable+0xf4/0x1cc) from [<c03cfeec>] >> > (kernel_init+0xc/0x164) >> > [<c03cfeec>] (kernel_init+0xc/0x164) from [<c00093b0>] >> > (ret_from_fork+0x14/0x24) >> > Code: e0433100 e1a0c000 e7920003 e24dd004 (e590302c) >> > ---[ end trace 61bb09c25216d85b ]--- >> > Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b >> > >> > >> > The problem is in the function "gpio_to_irq" in my board init functions >> > (navocap_baseboard_init). >> > >> > To know which lines the opps appears, I have followed this tutorial : >> > https://wiki.ubuntu.com/Kernel/KernelDebuggingTricks >> > >> > Thanks to it, I can notice that the opps appears when I called the >> > "gpio_to_irq" function in : >> > >> > ret = request_irq(gpio_to_irq(IMX_GPIO_NR(2,14)), detect_irq, >> > IRQF_TRIGGER_FALLING, "imx-mmc-detect", data); >> >> Make sure your arguments are not NULL (IMX_GPIO_NR, detect_irq and data). >> >> Some extra printk's before calling request_irq should do. > > > Thank you very much for your help ! > I will try that. > >> >> > >> > >> > I have checked in other boards how to use this function and it is >> > configured in the same way. >> > I did see where I have made a mistake. Maybe in my config file where I >> > have missed a configuration option ? How to solve this opps problem ? It >> > would be very great if someone could give me some helps / feedbacks on >> > this problem. >> > >> > Thank you in advance ! >> > >> > Best regards, >> > >> > >> > -- >> > Mylène JOSSERAND >> > Navocap >> > >> > _______________________________________________ >> > Kernelnewbies mailing list >> > Kernelnewbies@xxxxxxxxxxxxxxxxx<mailto:Kernelnewbies@xxxxxxxxxxxxxxxxx> >> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > > Best regards, > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
