El 27/03/2013 18:16, "Mylene Josserand" <mylene.josser...@navocap.com> 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. > > > 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@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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