Difference between revisions of "J-Link-OB-RX621-ARM-SWD"

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(Problem Description)
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#REDIRECT [[J-Link OB]]
J-Link OB is a single chip microcontroller "on-board" version of J-Link. It is designed to be a low-cost, single chip, on-board debug solution for evaluation boards. There are various J-Link-OB implementations available, which are based on different devices. This article refers to the J-Link-OB-RX621-ARM-SWD which is a J-Link-OB based on the Renesas RX621 series devices which is capable of debugging ARM based target devices like the Renesas Synergy series devices. For more information about what J-Link-OB, please refer to [https://www.segger.com/jlink-ob.html https://www.segger.com/jlink-ob.html]
 
 
== Enumeration under Ubuntu running in VirtualBox fails ==
 
 
=== Problem Description ===
 
Under special circumstances and with a special setup, it could happen with older bootloader versions of the J-Link-OB-RX621-ARM-SWD, that enumerating via USB in a Ubuntu environment running in VirtualBox failed and J-Link was not detected properly under Ubuntu. SEGGER has reproduced the issue with the following setup but it may also occur under other constellations as well:
 
* Host OS: Win7 64-bit
 
* VirtualBox: Version 5.0.18
 
* VirtualBox guest OS: Ubuntu 14.04 LTS
 
 
The problem only occurred if the J-Link was enumerating directly inside the VirtualBox guest OS. If it initially enumerated under the host OS and was connected to the VirtualBox guest OS later on, it worked fine.
 
 
=== Affected Evaluation Boards ===
 
This J-Link-OB model for example is used on the Renesas Synergy development kits.
 
 
=== Replacing the Bootloader (Fix) ===
 
As the fix requires to replace the bootloader of the J-Link OB, which can result (even if very unlikely) in a unusable J-Link-OB, the fix for this is not automatically applied when a new version of the J-Link software is installed. In the following it is described how to replace the bootloader of the J-Link-OB.
 
 
'''The following should only be done if you are affected by this problem. Please make sure that power supply to the J-Link-OB is stable. Unstable power supply during bootloader replacement can result in an unusable J-Link-OB.'''
 
 
Download and install the latest J-Link software:
 
* [https://www.segger.com/jlink-software.html Download]
 
Start J-Link Commander and perform firmware update if asked for
 
 
Execute '''updatebtl''' command
 
SEGGER J-Link Commander V5.41b (Compiled May 3 2016 13:50:50)
 
DLL version V5.41b, compiled May 3 2016 13:50:27
 
 
Connecting to J-Link via USB...O.K.
 
Firmware: J-Link OB RX621-ARM-SWD V1 compiled May 3 2016 12:18:23
 
Hardware version: V2.10
 
S/N: 708000000
 
VTref = 3.300V
 
 
 
Type "connect" to establish a target connection, '?' for help
 
J-Link>updatebtl
 
O.K.
 
J-Link>
 

Latest revision as of 09:24, 26 March 2019

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