Hello,
I am developing software on a Cyclone5 SoC Board. With Linux Kernel
version 4.15.
For loading our fpga-design we use device tree overlays with the altera
fpga-mgr.
We want to load and unload different device trees and
fpga-configurations with device tree overlays.
Now I considered a problem with the gpio-altera driver. Everything works
fine if I load the device tree overlay once. When I unload the device
tree and load the same device tree overlay again I get a kernel panic
inside the gpio-altera driver. If I dont use the altera-gpio driver and
use the uio-genirq-driver for our GPIOs everything works fine. The next
thing I found out: if I remove the interrupt section of the GPIO inside
the device tree overlay, unloading and loading the device tree with the
altera-gpio driver works as well. So it has to do something with the
interrupt handling.
As basic for our device tree configuration I used this site:
https://rocketboards.org/foswiki/Documentation/WS2LinuxKernelIntroductionForAlteraSoCDevicesLab4SoCFPGALinuxKernel
I send you the kernel panic log and my device-tree overlay. I hope you
can help me solving this problem. For so long I will use the uio-driver
instead of the gpio-altera driver.
Kind regards, Stefan.
part of the overlay.dts:
//plugin/; /
////{ /
/// fragment@0 { /
/// target-path = "/soc/base-fpga-region"; /
/// #address-cells = <2>; /
/// #size-cells = <1>; /
/// __overlay__ {/
/// #address-cells = <2>; /
/// #size-cells = <1>; /
//
/// firmware-name = "soc_system.rbf";/
////
/// pio_interrupt: gpio@0x100000000 {/
/// compatible = "altr,pio-18.1", "altr,pio-1.0";/
/// reg = <0x00000001 0x00000000 0x00000020>;/
/// interrupts = <0 72 1>;/
/// altr,gpio-bank-width = <8>; /*
embeddedsw.dts.params.altr,gpio-bank-width type NUMBER *//
/// altr,interrupt-type = <1>; /*
embeddedsw.dts.params.altr,interrupt-type type NUMBER *//
/// edge_type = <0>; /*
embeddedsw.dts.params.edge_type type NUMBER *//
/// level_trigger = <0>; /*
embeddedsw.dts.params.level_trigger type NUMBER *//
/// resetvalue = <0>; /*
embeddedsw.dts.params.resetvalue type NUMBER *//
/// #gpio-cells = <2>;/
/// gpio-controller;/
/// }; //end gpio@0x100000000 (pio_interrupt)/
//
/.../
kernel panic log:
/mount: /config: none already mounted on /config./
///[ 45.509108] fpga_manager fpga0: writing soc_system.rbf to Altera
SOCFPGA FPGA Manager/
///[ 45.544491] Unable to handle kernel NULL pointer dereference at
virtual address 00000080/
///[ 45.552586] pgd = c6020418/
///[ 45.555294] [00000080] *pgd=00000000/
///[ 45.558883] Internal error: Oops: 5 [#1] SMP ARM/
///[ 45.563494] Modules linked in: gpio_altera spi_altera/
///[ 45.568561] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
4.15.0-altera #11/
///[ 45.575154] Hardware name: Altera SOCFPGA/
///[ 45.579175] PC is at altera_gpio_irq_edge_handler+0x38/0x11c
[gpio_altera]/
///[ 45.586033] LR is at altera_gpio_irq_edge_handler+0x28/0x11c
[gpio_altera]/
///[ 45.592887] pc : [<bf0082f0>] lr : [<bf0082e0>] psr: a0010193/
///[ 45.599133] sp : c0c01e58 ip : c0c01e58 fp : c0c01e84/
///[ 45.604343] r10: c08d5140 r9 : e0803100 r8 : dc785a14/
///[ 45.609553] r7 : c0c0434c r6 : 00000000 r5 : 00000000 r4 :
dc785a00/
///[ 45.616060] r3 : c0449428 r2 : 00000000 r1 : db92a274 r0 :
00000000/
///[ 45.622571] Flags: NzCv IRQs off FIQs on Mode SVC_32 ISA ARM
Segment none/
///[ 45.629770] Control: 10c5387d Table: 1d62404a DAC: 00000051/
///[ 45.635503] Process swapper/0 (pid: 0, stack limit = 0x82a9ee73)/
///[ 45.641493] Stack: (0xc0c01e58 to 0xc0c02000)/
///[ 45.645843] 1e40: c0b7fcfc 00000000/
///[ 45.654001] 1e60: 00000000 c0b7fcfc 00000000 00000000 00000001
dd418800 c0c01e94 c0c01e88/
///[ 45.662158] 1e80: c016bb44 bf0082c4 c0c01ebc c0c01e98 c016c1b0
c016bb1c c0c0434c c0c47e9c/
///[ 45.670315] 1ea0: e080210c e0802100 c0c01ee8 e0803100 c0c01ee4
c0c01ec0 c01014f8 c016c150/
///[ 45.678472] 1ec0: c0108e60 60010013 ffffffff c0c01f1c 00000001
c0c00000 c0c01f44 c0c01ee8/
///[ 45.686629] 1ee0: c010db4c c01014a8 00000000 00037eec 1d041000
c011ba60 ffffe000 c0c03c28/
///[ 45.694785] 1f00: c0c03c74 00000001 00000001 c0c700ab c08d5140
c0c01f44 c0c01f48 c0c01f38/
///[ 45.702940] 1f20: c0108e5c c0108e60 60010013 ffffffff 00000051
00000000 c0c01f54 c0c01f48/
///[ 45.711096] 1f40: c076210c c0108e24 c0c01f84 c0c01f58 c015f320
c07620e8 c0b78244 000000c2/
///[ 45.719252] 1f60: c0c79800 c0c03c00 ffffffff c0c79800 c0b538c8
ddfffcc0 c0c01f94 c0c01f88/
///[ 45.727409] 1f80: c015f61c c015f24c c0c01fac c0c01f98 c075c7b4
c015f600 00000000 c0c79800/
///[ 45.735564] 1fa0: c0c01ff4 c0c01fb0 c0b00d74 c075c700 ffffffff
ffffffff 00000000 c0b00748/
///[ 45.743720] 1fc0: 00000000 c0b538c8 00000000 c0b0032c 00000051
10c0387d 00000000 03ff6000/
///[ 45.751876] 1fe0: 413fc090 10c5387d 00000000 c0c01ff8 00000000
c0b00a40 00000000 00000000/
///[ 45.760067] [<bf0082f0>] (altera_gpio_irq_edge_handler
[gpio_altera]) from [<c016bb44>] (generic_handle_irq+0x34/0x44)/
///[ 45.770745] [<c016bb44>] (generic_handle_irq) from [<c016c1b0>]
(__handle_domain_irq+0x6c/0xc4)/
///[ 45.779427] [<c016c1b0>] (__handle_domain_irq) from [<c01014f8>]
(gic_handle_irq+0x5c/0xa0)/
///[ 45.787765] [<c01014f8>] (gic_handle_irq) from [<c010db4c>]
(__irq_svc+0x6c/0x90)/
///[ 45.795222] Exception stack(0xc0c01ee8 to 0xc0c01f30)/
///[ 45.800267] 1ee0: 00000000 00037eec 1d041000
c011ba60 ffffe000 c0c03c28/
///[ 45.808423] 1f00: c0c03c74 00000001 00000001 c0c700ab c08d5140
c0c01f44 c0c01f48 c0c01f38/
///[ 45.816575] 1f20: c0108e5c c0108e60 60010013 ffffffff/
///[ 45.821633] [<c010db4c>] (__irq_svc) from [<c0108e60>]
(arch_cpu_idle+0x48/0x4c)/
///[ 45.829027] [<c0108e60>] (arch_cpu_idle) from [<c076210c>]
(default_idle_call+0x30/0x3c)/
///[ 45.837114] [<c076210c>] (default_idle_call) from [<c015f320>]
(do_idle+0xe0/0x140)/
///[ 45.844762] [<c015f320>] (do_idle) from [<c015f61c>]
(cpu_startup_entry+0x28/0x2c)/
///[ 45.852328] [<c015f61c>] (cpu_startup_entry) from [<c075c7b4>]
(rest_init+0xc0/0xc4)/
///[ 45.860063] [<c075c7b4>] (rest_init) from [<c0b00d74>]
(start_kernel+0x340/0x34c)/
///[ 45.867533] Code: e5947024 e5973028 e3530000 e1a05000 (e5906080)/
///[ 45.873614] ---[ end trace 3375238a48dbe91d ]---/
///[ 45.878221] Kernel panic - not syncing: Fatal exception in interrupt/
///[ 45.884569] CPU1: stopping/
///[ 45.887290] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G
D 4.15.0-altera #11/
///[ 45.895180] Hardware name: Altera SOCFPGA/
///[ 45.899211] [<c0112584>] (unwind_backtrace) from [<c010cdb0>]
(show_stack+0x20/0x24)/
///[ 45.906948] [<c010cdb0>] (show_stack) from [<c0746eac>]
(dump_stack+0x90/0xa4)/
///[ 45.914164] [<c0746eac>] (dump_stack) from [<c0110904>]
(handle_IPI+0x358/0x374)/
///[ 45.921548] [<c0110904>] (handle_IPI) from [<c0101538>]
(gic_handle_irq+0x9c/0xa0)/
///[ 45.929102] [<c0101538>] (gic_handle_irq) from [<c010db4c>]
(__irq_svc+0x6c/0x90)/
///[ 45.936559] Exception stack(0xdd509f30 to 0xdd509f78)/
///[ 45.941602] 9f20: 00000000 00023678 1d051000 c011ba60/
///[ 45.949760] 9f40: ffffe000 c0c03c28 c0c03c74 00000002 00000001
c0c700ab c08d5140 dd509f8c/
///[ 45.957915] 9f60: dd509f90 dd509f80 c0108e5c c0108e60 60060013
ffffffff/
///[ 45.964526] [<c010db4c>] (__irq_svc) from [<c0108e60>]
(arch_cpu_idle+0x48/0x4c)/
///[ 45.971912] [<c0108e60>] (arch_cpu_idle) from [<c076210c>]
(default_idle_call+0x30/0x3c)/
///[ 45.979990] [<c076210c>] (default_idle_call) from [<c015f320>]
(do_idle+0xe0/0x140)/
///[ 45.987635] [<c015f320>] (do_idle) from [<c015f61c>]
(cpu_startup_entry+0x28/0x2c)/
///[ 45.995192] [<c015f61c>] (cpu_startup_entry) from [<c0110334>]
(secondary_start_kernel+0x15c/0x164)/
///[ 46.004219] [<c0110334>] (secondary_start_kernel) from
[<0010194c>] (0x10194c)/
///[ 46.011430] ---[ end Kernel panic - not syncing: Fatal exception
in interrupt/
//
