Difference between revisions of "J-Link-OB-RX621-ARM-SWD"
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| + | #REDIRECT [[J-Link OB]] |
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| − | 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] |
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| − | == Enumeration under Ubuntu running in VirtualBox fails == |
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| − | === Problem description === |
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| − | 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: |
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| − | * Host OS: Win7 64-bit |
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| − | * VirtualBox: Version 5.0.18 |
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| − | * VirtualBox guest OS: Ubuntu 14.04 LTS |
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| − | The problem only occurred if the J-Linkk 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. |
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| − | === Affected Evaluation Boards === |
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| − | This J-Link-OB model for example is used on the Renesas Synergy development kits. |
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| − | === Fix === |
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| − | 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. |
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| − | '''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.''' |
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| − | Download and install J-Link software V5.41b or later: |
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| − | [https://www.segger.com/jlink-software-beta-version.html Betas] |
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| − | [https://www.segger.com/jlink-software.html Releases] |
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Latest revision as of 10:24, 26 March 2019
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