Hello, Vladimir. I am a student of computer engineering with some problems to multiplex my BeagleBoard xM. How did you edit your device tree? I feel like I'm at the very beginning of what I need to know to make my GPIO work, but I'd be grateful for any help your experience might bring me.
Thank you. Em sexta-feira, 15 de novembro de 2013 13:22:26 UTC-2, porkupan escreveu: > > On 3.12 an attempt to dump > */sys/kernel/debug/pinctrl/48002030.pinmux/pins* continues to cause a > kernel crash (not a complete crash, but bad enough): > > root@arm:~# cat /sys/kernel/debug/pinctrl/48002030.pinmux/pins > Segmentation fault > > http://paste.ubuntu.com/6421695/ > > [63418.031249] Unhandled fault: external abort on non-linefetch (0x1028) > at 0xfa002268 > [63418.039337] Internal error: : 1028 [#1] SMP ARM > [63418.044128] Modules linked in: ftdi_sio smsc95xx usbnet usbserial > joydev leds_pwm rtc_twl uio_pdrv_genirq gpio_keys phy_generic uio > [63418.056762] CPU: 0 PID: 1798 Comm: cat Not tainted 3.12.0-armv7-x8 #2 > [63418.063537] task: de739600 ti: df082000 task.ti: df082000 > [63418.069244] PC is at pcs_readw+0x0/0x10 > [63418.073303] LR is at pcs_pin_dbg_show+0x2c/0x4c > [63418.078094] pc : [<c0393d40>] lr : [<c0394a14>] psr: a0000013 > [63418.078094] sp : df083ee0 ip : 00000000 fp : c0961fb5 > [63418.090209] r10: de16088c r9 : c077a5e8 r8 : de1608b8 > [63418.095703] r7 : 0000011c r6 : df566a00 r5 : 0000011c r4 : df566a00 > [63418.102600] r3 : c0393d40 r2 : fa002030 r1 : df566a00 r0 : fa002268 > [63418.109466] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM > Segment user > [63418.117004] Control: 10c5387d Table: 9db08019 DAC: 00000015 > [63418.123046] Process cat (pid: 1798, stack limit = 0xdf082248) > [63418.129119] Stack: (0xdf083ee0 to 0xdf084000) > [63418.133728] 3ee0: de160880 0000011c df566a00 c038ef24 c038ee88 00000000 > df083f20 df566a00 > [63418.142364] 3f00: 00000001 00010000 000cf000 df083f80 dd9f1e40 c0139e58 > 00000000 df566a28 > [63418.151000] 3f20: 00000000 00000000 00000000 dd9f1e40 df083f80 dd9f1e40 > 000cf000 dd9f1e40 > [63418.159606] 3f40: df082018 df083f80 00010000 00000000 00000000 c011c1f8 > dd9f1e40 000cf000 > [63418.168243] 3f60: 00000000 00000000 dd9f1e40 00000000 000cf000 00010000 > 00000000 c011c914 > [63418.176879] 3f80: 00000000 00000000 00010000 00010000 000171c4 000cf000 > 00000003 c000da64 > [63418.185516] 3fa0: df082000 c000d8e0 00010000 000171c4 00000003 000cf000 > 00010000 000cf000 > [63418.194122] 3fc0: 00010000 000171c4 000cf000 00000003 7fffe000 00000000 > 00010000 00000000 > [63418.202758] 3fe0: 00000000 bead0574 0000b581 b6ef6f2c 40000010 00000003 > ffffffeb ff7fdfbf > [63418.211395] [<c0393d40>] (pcs_readw+0x0/0x10) from [<c0394a14>] > (pcs_pin_dbg_show+0x2c/0x4c) > [63418.220336] [<c0394a14>] (pcs_pin_dbg_show+0x2c/0x4c) from [<c038ef24>] > (pinctrl_pins_show+0x9c/0xd0) > [63418.230072] [<c038ef24>] (pinctrl_pins_show+0x9c/0xd0) from > [<c0139e58>] (seq_read+0x1b0/0x404) > [63418.239257] [<c0139e58>] (seq_read+0x1b0/0x404) from [<c011c1f8>] > (vfs_read+0xa4/0x168) > [63418.247711] [<c011c1f8>] (vfs_read+0xa4/0x168) from [<c011c914>] > (SyS_read+0x38/0x68) > [63418.256011] [<c011c914>] (SyS_read+0x38/0x68) from [<c000d8e0>] > (ret_fast_syscall+0x0/0x30) > [63418.264831] Code: e5d03000 e6ef0073 f57ff04f e12fff1e (e1d030b0) > [63418.307189] ---[ end trace 12432e5fbd2a5e32 ]--- > [63418.312133] In-band Error seen by MPU at address 0 > [63418.317260] ------------[ cut here ]------------ > [63418.322174] WARNING: CPU: 0 PID: 1798 at drivers/bus/omap_l3_smx.c:162 > omap3_l3_app_irq+0xcc/0x110() > [63418.331787] Modules linked in: ftdi_sio smsc95xx usbnet usbserial > joydev leds_pwm rtc_twl uio_pdrv_genirq gpio_keys phy_generic uio > [63418.344390] CPU: 0 PID: 1798 Comm: cat Tainted: G D > 3.12.0-armv7-x8 #2 > [63418.352233] [<c0014000>] (unwind_backtrace+0x0/0xdc) from [<c0010eb0>] > (show_stack+0x10/0x14) > [63418.361236] [<c0010eb0>] (show_stack+0x10/0x14) from [<c06febf0>] > (dump_stack+0x70/0x8c) > [63418.369781] [<c06febf0>] (dump_stack+0x70/0x8c) from [<c003b328>] > (warn_slowpath_common+0x64/0x88) > [63418.379241] [<c003b328>] (warn_slowpath_common+0x64/0x88) from > [<c003b3dc>] (warn_slowpath_null+0x18/0x20) > [63418.389434] [<c003b3dc>] (warn_slowpath_null+0x18/0x20) from > [<c038e034>] (omap3_l3_app_irq+0xcc/0x110) > [63418.399353] [<c038e034>] (omap3_l3_app_irq+0xcc/0x110) from > [<c007b104>] (handle_irq_event_percpu+0x6c/0x1fc) > [63418.409851] [<c007b104>] (handle_irq_event_percpu+0x6c/0x1fc) from > [<c007b2d4>] (handle_irq_event+0x40/0x60) > [63418.420227] [<c007b2d4>] (handle_irq_event+0x40/0x60) from [<c007dd2c>] > (handle_level_irq+0xd4/0xfc) > [63418.429840] [<c007dd2c>] (handle_level_irq+0xd4/0xfc) from [<c007a968>] > (generic_handle_irq+0x20/0x30) > [63418.439666] [<c007a968>] (generic_handle_irq+0x20/0x30) from > [<c000e1c4>] (handle_IRQ+0x68/0x90) > [63418.448944] [<c000e1c4>] (handle_IRQ+0x68/0x90) from [<c00085d8>] > (omap3_intc_handle_irq+0x60/0x74) > [63418.458496] [<c00085d8>] (omap3_intc_handle_irq+0x60/0x74) from > [<c07038c0>] (__irq_svc+0x40/0x50) > [63418.467956] Exception stack(0xdf083cd8 to 0xdf083d20) > [63418.473266] 3cc0: > df5ca9c4 00003572 > [63418.481903] 3ce0: df5ca4c0 00000504 df6cedc0 df082000 00000b58 00000001 > df082000 0000000b > [63418.490539] 3d00: c0ac97b0 c0393d40 00000000 df083d20 c0095a4c c0095b54 > 40000113 ffffffff > [63418.499176] [<c07038c0>] (__irq_svc+0x40/0x50) from [<c0095b54>] > (acct_collect+0x19c/0x1a0) > [63418.507995] [<c0095b54>] (acct_collect+0x19c/0x1a0) from [<c003d6c0>] > (do_exit+0x1d0/0x940) > [63418.516815] [<c003d6c0>] (do_exit+0x1d0/0x940) from [<c001115c>] > (die+0x2a8/0x3a0) > [63418.524810] [<c001115c>] (die+0x2a8/0x3a0) from [<c00083b8>] > (do_DataAbort+0x84/0x98) > [63418.533081] [<c00083b8>] (do_DataAbort+0x84/0x98) from [<c0703858>] > (__dabt_svc+0x38/0x60) > [63418.541778] Exception stack(0xdf083e98 to 0xdf083ee0) > [63418.547119] 3e80: > fa002268 df566a00 > [63418.555755] 3ea0: fa002030 c0393d40 df566a00 0000011c df566a00 0000011c > de1608b8 c077a5e8 > [63418.564361] 3ec0: de16088c c0961fb5 00000000 df083ee0 c0394a14 c0393d40 > a0000013 ffffffff > [63418.573028] [<c0703858>] (__dabt_svc+0x38/0x60) from [<c0393d40>] > (pcs_readw+0x0/0x10) > [63418.581359] [<c0393d40>] (pcs_readw+0x0/0x10) from [<c0394a14>] > (pcs_pin_dbg_show+0x2c/0x4c) > [63418.590270] [<c0394a14>] (pcs_pin_dbg_show+0x2c/0x4c) from [<c038ef24>] > (pinctrl_pins_show+0x9c/0xd0) > [63418.600036] [<c038ef24>] (pinctrl_pins_show+0x9c/0xd0) from > [<c0139e58>] (seq_read+0x1b0/0x404) > [63418.609222] [<c0139e58>] (seq_read+0x1b0/0x404) from [<c011c1f8>] > (vfs_read+0xa4/0x168) > [63418.617675] [<c011c1f8>] (vfs_read+0xa4/0x168) from [<c011c914>] > (SyS_read+0x38/0x68) > [63418.625946] [<c011c914>] (SyS_read+0x38/0x68) from [<c000d8e0>] > (ret_fast_syscall+0x0/0x30) > [63418.634735] ---[ end trace 12432e5fbd2a5e33 ]--- > > > On Thursday, October 31, 2013 4:13:58 PM UTC-4, porkupan wrote: >> >> Well, so I think I understand a bit more about the DTS support for GPIO. >> I configured the pinctrl for GPIO5 channel, and it seems to have some >> effect on the GPIO pins. After the kernel starts up the LEDs are being >> turned off. >> >> &omap3_pmx_core { >> vvv_gpio_pins: pinmux_gpio_pins { >> pinctrl-single,pins = < >> 0x136 (PIN_OUTPUT | MUX_MODE4) /* >> gpio_137 */ >> 0x138 (PIN_OUTPUT | MUX_MODE4) /* >> gpio_138 */ >> 0x13a (PIN_OUTPUT | MUX_MODE4) /* >> gpio_139 */ >> >; >> }; >> }; >> >> &gpio5 { >> pinctrl-names = "default"; >> pinctrl-0 = <&vvv_gpio_pins>; >> }; >> >> However the GPIO export mechanism from userspace is still not working. >> Basically, no matter what value you try to set gpio137-139, they stay low >> (although the value in the /sys/class/gpio/gpioXXX/value file is being >> changed appropriately. It's as if gpiochip128 is not really associated >> with gpio5. >> >> I am also worried about not being able to dump >> */sys/kernel/debug/pinctrl/48002030.pinmux/pins* . The kernel hiccup >> occurs on the base 3.11 DTB file, so it's not my change that's causing it. >> >> >> >> On Friday, October 25, 2013 3:13:46 PM UTC-4, porkupan wrote: >>> >>> Trying to dump the pinmux states >>> (/sys/kernel/debug/pinctrl/48002030.pinmux/pins) in 3.11 seems to cause a >>> kernel crash: >>> http://paste.ubuntu.com/6302171/ >>> >>> GPIO access via /sys/class/gpio appears to be nonoperational in 3.11. >>> It looks like a reasonable assumption that GPIOs may not be muxed into the >>> GPIO pins. >>> >>> I tried to add a devicetree entry to to force-mux GPIOs: >>> >>> &omap3_pmx_core { >>> vvv_gpio_pins: pinmux_gpio_pins { >>> pinctrl-single,pins = < >>> 0x134 (PIN_OUTPUT | MUX_MODE4) /* >>> gpio_137 */ >>> 0x135 (PIN_OUTPUT | MUX_MODE4) /* >>> gpio_138 */ >>> 0x136 (PIN_OUTPUT | MUX_MODE4) /* >>> gpio_139 */ >>> >; >>> }; >>> }; >>> >>> &ocp { >>> gpio_helper: helper { >>> compatible = "ti,omap3-gpio"; >>> pinctrl-names = "default"; >>> pinctrl-0 = <&vvv_gpio_pins>; >>> status = "okay"; >>> }; >>> }; >>> >>> Doesn't seem to do anything. The only indication that the kernel is >>> actually trying to parse the fake "helper" device is these lines in the >>> message log: >>> >>> [ 0.369201] omap_gpio helper.26: could not find pctldev for node >>> /ocp/pinmux@48002030/pinmux_gpio_pins, deferring probe >>> [ 0.369232] platform helper.26: Driver omap_gpio requests probe deferral >>> <...> >>> [ 3.354125] omap_gpio helper.26: Invalid IRQ resource >>> >>> Obviously, I have no idea what "compatible" driver should I chose, >>> omap3_gpio just sounded like something that could fit. For BBB they >>> reference bone-pinmux-helper, which I assume is BBB-specific? >>> >>> Thanks! >>> >>> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. 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