Digilent Embedded Linux Instrukcja Użytkownika Pobierz pdf (Strona 21)

Using Zynq with Linux

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GDB will show where the kernel is hanging up. Example 21 shows that the kernel hangs at function

xuart_console_wait_tx. You can back trace the function call procedure with the command

backtrace.

Example 21.

(gdb) target remote localhost:1234

Remote debugging using localhost:1234

0xc01ea030 in xuartps_console_wait_tx (port=0xc0b84d78) at

drivers/tty/serial/xilinx_uartps.c:944

944 while ((xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY)

(gdb) backtrace

#0 0xc01ea030 in xuartps_console_wait_tx (port=0xc0b84d78) at

drivers/tty/serial/xilinx_uartps.c:944

#1 0xc01ea05c in xuartps_console_putchar (port=0xc0b84d78, ch=91) at

drivers/tty/serial/xilinx_uartps.c:958

#2 0xc01e6e4c in uart_console_write (port=0xc0b84d78, s=<value optimized

out>, count=78, putchar=0xc01ea03c <xuartps_console_putchar>) at

drivers/tty/serial/serial_core.c:1680

#3 0xc01ea1d8 in xuartps_console_write (co=<value optimized out>,

s=0xc0731df9 "[ 2.140000] usb 1-1.2: new low-speed USB device number 3

using xusbps-ehci\n WARNING: at arch/arm/mm/dma-mapping.c:198

consistent_init+0x78/0x10c()\n<4>[ 0.430000] Modules linked in:\n<4>[

0.430"..., count=78)

at drivers/tty/serial/xilinx_uartps.c:985

#4 0xc00226bc in __call_console_drivers (start=20840, end=20918) at

kernel/printk.c:520

#5 0xc0022760 in _call_console_drivers (start=<value optimized out>,

end=20918, msg_log_level=<value optimized out>) at kernel/printk.c:553

#6 0xc0022f70 in call_console_drivers () at kernel/printk.c:654

#7 console_unlock () at kernel/printk.c:1275

#8 0xc0023564 in vprintk (fmt=<value optimized out>, args=...) at

kernel/printk.c:964

#9 0xc039d8bc in printk (fmt=0xc04a7dad "%s%s %s: %pV") at

kernel/printk.c:756

#10 0xc020b5b8 in __dev_printk (level=0xc049befa "<6>", dev=0xd93f8468,

vaf=0xd847be74) at drivers/base/core.c:1846

#11 0xc020b60c in _dev_info (dev=<value optimized out>, fmt=0xc04af2e6 "%s %s

USB device number %d using %s\n") at drivers/base/core.c:1895

#12 0xc02581f4 in hub_port_init (hub=0xd93fae00, udev=0xd93f8400, port1=2,

retry_counter=0) at drivers/usb/core/hub.c:2935

#13 0xc025abf0 in hub_port_connect_change (__unused=<value optimized out>) at

drivers/usb/core/hub.c:3329

#14 hub_events (__unused=<value optimized out>) at drivers/usb/core/hub.c:3645

#15 hub_thread (__unused=<value optimized out>) at drivers/usb/core/hub.c:3704

#16 0xc0042b94 in kthread (_create=0xd805befc) at kernel/kthread.c:121

#17 0xc000e820 in kernel_thread_helper ()

Backtrace stopped: frame did not save the PC

(gdb) l

939 **/

940 static void xuartps_console_wait_tx(struct uart_port *port)

941 {

942 // unsigned int timeout = 10000;

943

944 while ((xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY)

945 != XUARTPS_SR_TXEMPTY)

946 // != XUARTPS_SR_TXEMPTY && --timeout)

947 barrier();

948 }

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