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器件型号：AM5728 大家好、
首先、我的设置的详细信息：
- BeagleBoard X15
- TI-processor-sdk-linux-am57xx-evm-06.03.00.106
- arago-base-tisdk-image-am57xx-evm.tar.xz
我要做的是：
- 尝试读取 GPIO3寄存器
root@am57xx-evm:~# devmem2 0x48057000 /dev/mem opened. [ 1391.870005] Unhandled fault: asynchronous external abort (0x1211) at 0x00000000 [ 1391.870014] ------------[ cut here ]------------ [ 1391.878776] pgd = 69343cc2 [ 1391.883419] WARNING: CPU: 0 PID: 0 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x330/0x380 [ 1391.886121] [00000000] *pgd=ac0b3003, *pmd=fe1be003 [ 1391.895290] 44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4_PER1_P3 (Read): Data Access in User mode during Functional access [ 1391.911786] Modules linked in: hid_multitouch usbhid xhci_plat_hcd xhci_hcd usbcore pru_rproc irq_pruss_intc pruss dwc3 udc_core usb_common snd_soc_simple_card snd_soc_simple_card_utils snd_soc_omap_hdmi ahci_platform libahci_platform libahci omap_aes_driver pruss_soc_bus omap_sham omap_wdt phy_omap_usb2 libata ti_sc ti_csc ti_vpdma dwc3_omap rtc_omap extcon_palmas rtc_palmas at24 snd_soc_tlv320aic3x omap_des omap_hdq rtc_ds1307 des_generic crypto_engine omap_crypto wire omap_remoteproc virtio_rpmsg_bus remoteproc sch_fq_codel [ 1391.958715] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.94-gbe5389fd85 #2 [ 1391.965794] Hardware name: Generic DRA74X (Flattened Device Tree) [ 1391.971913] Backtrace: [ 1391.974378] [<c020ca34>] (dump_backtrace) from [<c020cd6c>] (show_stack+0x18/0x1c) [ 1391.981985] r7:c0df207c r6:60060193 r5:00000000 r4:c124f5dc [ 1391.987674] [<c020cd54>] (show_stack) from [<c09ed064>] (dump_stack+0x9c/0xb0) [ 1391.994932] [<c09ecfc8>] (dump_stack) from [<c022e100>] (__warn+0xdc/0xf8) [ 1392.001838] r7:c0df207c r6:00000009 r5:00000000 r4:c1201cbc [ 1392.007524] [<c022e024>] (__warn) from [<c022dd38>] (warn_slowpath_fmt+0x50/0x6c) [ 1392.015042] r9:ee9d39c0 r8:f0882164 r7:c0df1fa8 r6:c0df1ee8 r5:c0df204c r4:c1204c48 [ 1392.022823] [<c022dcec>] (warn_slowpath_fmt) from [<c0566bcc>] (l3_interrupt_handler+0x330/0x380) [ 1392.031732] r3:ee9d7f00 r2:c0df204c [ 1392.035322] r5:00000002 r4:80080003 [ 1392.038920] [<c056689c>] (l3_interrupt_handler) from [<c02895ec>] (__handle_irq_event_percpu+0x68/0x140) [ 1392.048444] r10:c12511f8 r9:ee9d9f00 r8:00000017 r7:c1201de8 r6:00000000 r5:ee9d9f68 [ 1392.056307] r4:ee9df3c0 [ 1392.058857] [<c0289584>] (__handle_irq_event_percpu) from [<c02896f8>] (handle_irq_event_percpu+0x34/0x88) [ 1392.068555] r10:c10674f0 r9:c1200000 r8:ee80c000 r7:00000001 r6:ee9d9f00 r5:ee9d9f68 [ 1392.076417] r4:c1204c48 [ 1392.078966] [<c02896c4>] (handle_irq_event_percpu) from [<c028978c>] (handle_irq_event+0x40/0x64) [ 1392.087878] r6:c120a434 r5:ee9d9f68 r4:ee9d9f00 [ 1392.092518] [<c028974c>] (handle_irq_event) from [<c028d4dc>] (handle_fasteoi_irq+0xc0/0x168) [ 1392.101080] r7:00000001 r6:c120a434 r5:ee9d9f68 r4:ee9d9f00 [ 1392.106768] [<c028d41c>] (handle_fasteoi_irq) from [<c02887e8>] (generic_handle_irq+0x2c/0x3c) [ 1392.115418] r7:00000001 r6:00000000 r5:00000000 r4:c1067cfc [ 1392.121106] [<c02887bc>] (generic_handle_irq) from [<c0288e4c>] (__handle_domain_irq+0x64/0xbc) [ 1392.129847] [<c0288de8>] (__handle_domain_irq) from [<c0564f08>] (gic_handle_irq+0x44/0x80) [ 1392.138237] r9:c1200000 r8:fa213000 r7:c1201eb0 r6:fa212000 r5:fa21200c r4:c1205104 [ 1392.146018] [<c0564ec4>] (gic_handle_irq) from [<c02019f8>] (__irq_svc+0x58/0x8c) [ 1392.153532] Exception stack(0xc1201eb0 to 0xc1201ef8) [ 1392.158607] 1ea0: 00000000 00098140 eed5750c c0222250 [ 1392.166822] 1ec0: ffffe000 c1204c7c c1204cc4 00000001 00000000 00000000 c10674f0 c1201f0c [ 1392.175036] 1ee0: c1201eec c1201f00 c0221ee4 c0208e94 a0060013 ffffffff [ 1392.181680] r9:c1200000 r8:00000000 r7:c1201ee4 r6:ffffffff r5:a0060013 r4:c0208e94 [ 1392.189471] [<c0208e6c>] (arch_cpu_idle) from [<c0a070bc>] (default_idle_call+0x30/0x34) [ 1392.197603] [<c0a0708c>] (default_idle_call) from [<c025a9a8>] (do_idle+0x204/0x2ac) [ 1392.205383] [<c025a7a4>] (do_idle) from [<c025ad3c>] (cpu_startup_entry+0x20/0x24) [ 1392.212988] r10:c104aa38 r9:c1252d00 r8:ffffffff r7:c1252d00 r6:00000000 r5:00000002 [ 1392.220851] r4:000000c7 [ 1392.223399] [<c025ad1c>] (cpu_startup_entry) from [<c0a01364>] (rest_init+0xd0/0xd4) [ 1392.231182] [<c0a01294>] (rest_init) from [<c1000dfc>] (start_kernel+0x448/0x470) [ 1392.238696] r5:00000000 r4:c1252d58 [ 1392.242289] [<c10009b4>] (start_kernel) from [<00000000>] ( (null)) [ 1392.248669] ---[ end trace b634836f5c4f6656 ]--- Memory mapped at address 0xb6f2b000. Bus error (core dumped)
到目前为止、我已经尝试了以下操作：
- 我在这里四处走动、不能让 GPIO3_11与 sysfs 一起工作
- 我看到 gp EVM 套件中的摄像头模块可能正在使用 GPIO3_11
- 因此、我在内核中禁用了该功能(驱动程序->多媒体->摄像头->关闭)、以查看它是否会释放 GPIO3
- 它没有
如果有任何帮助说明我无法读取 GPIO3或使用 GPIO3的原因、我们将不胜感激。
谢谢！
Nathan
