Digilent Embedded Linux User Manual
Page 20
Using Zynq with Linux
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Example 20.
Locating codes using GDB and XMD
Another good way to debug the kernel is to use a GDB remote protocol with the Xilinx Microprocessor
Debugger (XMD) via JTAG to debug a running kernel on a Zynq AP SoC based Digilent Board. In the
command line of the host PC, open XMD and connect to the Zynq board using the command:
xmd> connect arm hw.
Open another command line on your host PC, and run GDB using command: $gdb –nw vmlinux.
Then, under the GDB command prompt, connect to the port created by XMD (the default should be
localhost:1234) with the command: (gdb) target remote localhost:1234.
[ 0.990000] kernel BUG at arch/arm/mm/dma-mapping.c:254!
[ 0.990000] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[ 0.990000] Modules linked in:
[ 0.990000] CPU: 1 Tainted: G W (3.3.0-digilent-12.07-zed-beta-dirty #3)
[ 0.990000] PC is at __dma_alloc+0x1c4/0x2f0
[ 0.990000] LR is at arm_vmregion_alloc+0xe0/0x110
[ 0.990000] pc : [
[ 0.990000] sp : d8061da8 ip : 00384000 fp : c085f000
[ 0.990000] r10: d82436c0 r9 : c085f000 r8 : 00000005
[ 0.990000] r7 : 00000100 r6 : dfffc400 r5 : 00384000 r4 : fffc066f
[ 0.990000] r3 : fd600000 r2 : 00000000 r1 : 00000001 r0 : d82436c0
[ 0.990000] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
[ 0.990000] Control: 18c5387d Table: 0000404a DAC: 00000015
[ 0.990000] Process kworker/1:0 (pid: 8, stack limit = 0xd80602f0)
[ 0.990000] Stack: (0xd8061da8 to 0xd8062000)
[ 0.990000] 1da0: c047d174 d8061e78 00000001 d8249f98 d8204800 d8249f40
[ 0.990000] 1dc0: d8204800 00384000 d8204800 00000000 00000004 00384000 00000000 c00161ac
[ 0.990000] 1de0: 00000447 00384000 d8249f98 c0190598 d8061e78 00000001 d837bdc0 c017cc00
[ 0.990000] 1e00: 00000500 000002d0 00000020 d8061e24 00000000 00000500 000002d0 34325258
[ 0.990000] 1e20: 00000000 00000000 00000000 00000000 00000000 00001400 00000000 00000000
[ 0.990000] 1e40: 00000000 00000000 00000000 00000000 00000000 d82c7340 d837bdc0 00000001
[ 0.990000] 1e60: 000002d0 00000500 00000001 d8061ecc d8204038 c017ad38 00000500 000002d0
[ 0.990000] 1e80: 00000500 000002d0 00000020 00000018 d837bdc0 00000001 d8204800 00000020
[ 0.990000] 1ea0: d8200d00 c017af94 00000000 c0093144 05d1745d d837bdc0 d8204800 00000001
[ 0.990000] 1ec0: 00000000 c0093210 c04801c4 00000000 d837bdc0 d8204800 00000020 00000000
[ 0.990000] 1ee0: 00000001 c09464e8 c0486d5c c017ca84 d8204800 d82c76c0 00000000 c04b2360
[ 0.990000] 1f00: c093a834 c0191390 d8061f10 c0184774 c093a5e0 00000001 00000000 c03dae33
[ 0.990000] 1f20: 00000000 d8204a50 00000001 00000000 c0486c68 00000000 c0486c68 00000000
[ 0.990000] 1f40: d8204800 d8204a50 00000000 c01861a4 d80bbe00 c0486c68 00000001 c04b2360
[ 0.990000] 1f60: d80179c0 c0946400 c0949c00 c01914c8 00000000 c00325e0 d80179c0 00000000
[ 0.990000] 1f80: c0486d60 d80179c0 c0946400 d80179d0 00000001 c0946400 00000000 00000009
[ 0.990000] 1fa0: 00000000 c0032be0 00000000 d804ff00 d80179c0 c0032a34 00000013 00000000
[ 0.990000] 1fc0: 00000000 c0035e94 c000dfcc 00000000 d80179c0 00000000 00000000 00000000
[ 0.990000] 1fe0: d8061fe0 d8061fe0 d804ff00 c0035e14 c000dfcc c000dfcc 65111104 16010002
[ 0.990000] [
(dma_alloc_writecombine+0x1c/0x24)
[ 0.990000] [
(drm_gem_cma_create+0x4c/0xc8)
[ 0.990000] [
(drm_fbdev_cma_probe+0xa8/0x20c)
[ 0.990000] [
(drm_fb_helper_single_fb_probe+0x190/0x278)
[ 0.990000] [
(drm_fb_helper_initial_config+0x174/0x1b0)
[ 0.990000] [
(drm_fbdev_cma_init+0xa8/0xd4)
[ 0.990000] [
(analog_drm_load+0x100/0x154)
[ 0.990000] [
(drm_get_platform_dev+0xe0/0x1bc)
[ 0.990000] [
(process_one_work+0x1d4/0x304)
[ 0.990000] [
(worker_thread+0x1ac/0x2c4)
[ 0.990000] [
[ 0.990000] [
[ 0.990000] Code: e0866107 e5964000 e3540000 0a000000 (e7f001f2)