Hello everyone, I am fairly new to kernel development and definitely very new to embedded kernel development; if this question does not belong on this list maybe you can direct me to the appropriate one... I have ARM development board from Star Semiconductor with their STR8133 ARM9 CPU. I am running kernel version 2.6.16 and have a PCI board hooked up to it. My kernel module that controls the board works perfectly fine but I get constant "irq6: nobody cared" error messages followed by a stack dump [look below for example]. I confirmed that during this time none of the interrupt bits in any of the status registers on the board are set. I have an access to a logic analyzer and so I hooked it up to a PCI breakout board and confirmed that my interrupt handler is called way before the board drives the INTA# line. cat /proc/interrupts shows that my module is the only one on IRQ6. The module is actually used by another kernel module that utilizes kthreads [puts them to sleep, wakes the up, etc.] My question is this: Assuming there is no hardware problem, are there some fundamental differences between regular Linux kernel and embedded kernel that can 'cause this kind of behavior? Any information or suggestions would be highly appreciated. -- ilya Example of a dump: irq6: nobody cared Pid: 664, comm: file-storage-ga CPU: 0 PC is at l800_queue+0x170/0x260 [l800_wudc] LR is at wake_up_process+0x18/0x20 pc : [<bf009ce0>] lr : [<c0042618>] Not tainted sp : c10ade44 ip : 00000000 fp : c10ade7c r10: c0ab29b5 r9 : bf013a0c r8 : c0ab2995 r7 : c0ab4860 r6 : 0000000d r5 : 00000001 r4 : ffffffff r3 : 60000013 r2 : 80000093 r1 : 0000000f r0 : 00000000 Flags: nZcv IRQs on FIQs on Mode SVC_32 Segment kernel Control: 397F Table: 00844000 DAC: 00000017 [<c0027b60>] (show_regs+0x0/0x50) from [<c00268fc>] (report_bad_irq+0x5c/0xd0) r4 = C0311D00 [<c00268a0>] (report_bad_irq+0x0/0xd0) from [<c0026d34>] (do_level_IRQ+0xd4/0x190) r6 = C0363D98 r5 = 00000000 r4 = 00000000 [<c0026c60>] (do_level_IRQ+0x0/0x190) from [<c0026e44>] (asm_do_IRQ+0x54/0x150) [<c0026df0>] (asm_do_IRQ+0x0/0x150) from [<c00259d4>] (__irq_svc+0x34/0x60) r8 = C0AB2995 r7 = C0AB4860 r6 = 0000000D r5 = FFF1B140 r4 = FFFFFFFF [<bf009b70>] (l800_queue+0x0/0x260 [l800_wudc]) from [<bf01b3b0>] (start_transfer+0x90/0x2c0 [g_file_storage]) [<bf01b320>] (start_transfer+0x0/0x2c0 [g_file_storage]) from [<bf01c4a0>] (send_status+0x180/0x250 [g_file_storage]) [<bf01c320>] (send_status+0x0/0x250 [g_file_storage]) from [<bf01e230>] (fsg_main_thread+0x910/0x1ff0 [g_file_storage]) [<bf01d920>] (fsg_main_thread+0x0/0x1ff0 [g_file_storage]) from [<c005fed4>] (kthread+0xf4/0x130) [<c005fde0>] (kthread+0x0/0x130) from [<c0049e10>] (do_exit+0x0/0x8c0) handlers: [<bf0085f0>] (l800_irq+0x0/0x10f0 [l800_wudc]) -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
