build/tools/amebad : Update J-link README.md
1) Modify J-link and AmebaD connections
2) Add the path for clarification
### Preparations
-1. Prepare J-Link with firmware upgraded to V10.
-2. Install JLinkGDBServer.
-3. Set 'environment variable' for JLinkGDBServer if not done so.
+1. Prepare J-Link and Download JLinkGDBServer from the [link](https://www.segger.com/downloads/jlink/#J-LinkSoftwareAndDocumentationPack) and install as below.
+```
+$ sudo dpkg -i JLink_Linux_V686g_x86_64.deb
+```
-=============================
+2. Upgrade the firmware to V10 and verify through the message of 'GDB Server' window like below.
+```
+Firmware : J-Link V10 compiled Jan 7 2020 16:51:47
+```
### Connection
-Jlink AmebaD
-VCC -> 3.3v
-GND -> GND
-SWDIO -> DATA
-SWCLK -> CLK
+| J-Link | AmebaD |
+|--------|--------|
+| VCC | 3.3v |
+| GND | GND |
+| SWDIO | DATA |
+| SWCLK | CLK |
-=============================
+Refer to J-Link interface information [link](https://www.segger.com/products/debug-probes/j-link/technology/interface-description/).
### How to use?
-1. Build TizenRT and make sure 'tinyara.axf' is generated.
-2. Run 'jlink_debug.sh' in this directory.
+1. Build TizenRT and make sure 'tinyara.axf' is generated in *build/output/bin* folder.
+2. Run 'jlink_debug.sh' from *build/tools/amebad/gnu_utility* folder.
3. Enter gdb debug command in the 'GDB Client' window.
-=============================
