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Update a README file.

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Gregory Nutt 2017-08-22 12:35:58 -06:00
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configs/same70-xplained/README.txt
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@ -1039,11 +1039,15 @@ Tickless OS
Debugging Debugging
========= =========
EDBG
----
The on-board EDBG appears to work only with Atmel Studio. You can however, The on-board EDBG appears to work only with Atmel Studio. You can however,
simply connect a SAM-ICE or J-Link to the JTAG/SWD connector on the board simply connect a SAM-ICE or J-Link to the JTAG/SWD connector on the board
and that works great. The only tricky thing is getting the correct and that works great. The only tricky thing is getting the correct
orientation of the JTAG connection. orientation of the JTAG connection.
J-Link/JTAG
-----------
I have been using Atmel Studio to write code to flash then I use the Segger I have been using Atmel Studio to write code to flash then I use the Segger
J-Link GDB server to debug. I have been using the 'Device Programming' I J-Link GDB server to debug. I have been using the 'Device Programming' I
available under the Atmel Studio 'Tool' menu. I have to disconnect the available under the Atmel Studio 'Tool' menu. I have to disconnect the
@ -1058,6 +1062,57 @@ Debugging
(gdb) file nuttx (gdb) file nuttx
(gdb) ... start debugging ... (gdb) ... start debugging ...
OpenOCD/EDBG
------------
Current OpenOCD also works with SAME70-Xplained via EDBG, but I have not
used OpenOCD with the board.
SAM-BA
------
SAM-BA is another option. With SAM-BA, you can load code into FLASH over
a serial port or USB connection by booting into the ROM bootloader.
CMSIS-DAP Programmer
--------------------
Another useful tool for CMSIS-DAP programmer (formerly Atmel EDBG
programmer) available at:
https://github.com/ataradov/edbg
This is a simple command line utility for programming ARM-based MCUs
(currently only Atmel) though CMSIS-DAP SWD interface. It works on Linux,
Mac OS X and Windows. Very useful to around especially if you have the
following issue:
Booting to FLASH or the ROM Bootloader
--------------------------------------
If you use EDBG or JTAG to load code into FLASH, you may be puzzled why
the code does not run. It may be that you are booting into the ROM
bootloader instead of FLASH. That can be fixed by modifying the SAME70's
GPNVM bits.
If your SAME70 is booting in ROM by default, the GPNVM bits will probably
looking something like:
$ edbg.exe -F r,:, -t atmel_cm7
GPNVM Bits: 0x40
Where bit 1 = 0 boots into the ROM bootloader and bit 1 = 1 boots into
FLASH. You want:
$ edbg.exe -F r,:, -t atmel_cm7
GPNVM Bits: 0x42
Those bits can be changed using CMSIS-DAP programmer, Atmel studio, or
using this OpenOCD setup:
atsamv gpnvm [('clr'|'set'|'show') bitnum]
Without arguments, shows all bits in the gpnvm register.
Otherwise, clears, sets, or shows one General Purpose Non-Volatile
Memory (gpnvm) bit.
Perhaps SAM-BA supports a way to do this as well???
Using OpenOCD and GDB to flash via the EDBG chip Using OpenOCD and GDB to flash via the EDBG chip
================================================ ================================================