Changes between Version 1 and Version 2 of Debugging/OpenOCD/Raspberry_Pi

Timestamp:

06/15/16 15:10:02 (8 years ago)

Author:

Pavel Pisa

Comment:

Rung RPi OpenOCD debug without setup of pins in u-boot.

Debugging/OpenOCD/Raspberry_Pi

@@ -17 +17 @@
 mw.l 0x20200008 0x65b6c0
 }}}
+or apply next change to RTEMS sources
+{{{
+--- a/c/src/lib/libbsp/arm/raspberrypi/startup/bspstarthooks.c
++++ b/c/src/lib/libbsp/arm/raspberrypi/startup/bspstarthooks.c
+@@ -29,6 +29,15 @@
+ #include <libcpu/arm-cp15.h>
+ #include <bsp.h>
+
++void ll_strout(char *str)
++{
++  char ch;
++  while ((ch = *(str++)) != 0) {
++    if (ch == '\n')
++      bcm2835_usart_fns.deviceWritePolled(0, '\r');
++    bcm2835_usart_fns.deviceWritePolled(0, ch);
++  }
++}
+
+ void BSP_START_TEXT_SECTION bsp_start_hook_0(void)
+ {
+@@ -66,6 +75,21 @@ void BSP_START_TEXT_SECTION bsp_start_hook_0(void)
+
+   /* Clear Secure or Non-secure Vector Base Address Register */
+   arm_cp15_set_vector_base_address(0);
++
++  /* Enable JTAG */
++  rtems_gpio_bsp_select_specific_io(0, 22, RPI_ALT_FUNC_4);
++  rtems_gpio_bsp_select_specific_io(0, 4,  RPI_ALT_FUNC_5);
++  rtems_gpio_bsp_select_specific_io(0, 27, RPI_ALT_FUNC_4);
++  rtems_gpio_bsp_select_specific_io(0, 25, RPI_ALT_FUNC_4);
++  rtems_gpio_bsp_select_specific_io(0, 23, RPI_ALT_FUNC_4);
++  rtems_gpio_bsp_select_specific_io(0, 24, RPI_ALT_FUNC_4);
++
++  if (1) {
++    ll_strout("JTAG Enabled and waiting for GDB\n");
++
++    continue_execution = 0;
++    while (!continue_execution);
++  }
+ }
+
+ void BSP_START_TEXT_SECTION bsp_start_hook_1(void)
+}}}
+Start RTEMS, when message appears connect from OpenOCD, setup breakpoints and set continue_execution to one
+{{{
+(gdb) set continue_execution=1
+}}}
+
 
 File "rpi-jt_usb5.cfg":