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Update note in mbed_targets.md #1013

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14 changes: 11 additions & 3 deletions docs/reference/configuration/mbed_targets.md
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Expand Up @@ -198,9 +198,17 @@ If you specify `ARMC5` in `supported_toolchains`, it means the corresponding tar

If a target lists both `ARMC5` and `ARM` (or `ARMC6`) in `supported_toolchains`, the Arm Compiler 6.11 will be used when compiling with `ARM` option for `--toolchain`.

<span class="notes">**Note:** Although you can specify `ARMC5` in `supported_toolchains` in `targets.json`, it's not a valid option for `--toolchain` when compiling using [Mbed CLI](../tools/developing-mbed-cli.html).
Arm Compiler 6 is the default ARM toolchain for Mbed OS developmet. Most Mbed OS platforms are already compatible with Arm Compiler 6. Some existing targets still supporting Arm Compiler 5 will be migrated to Arm Compiler 6 in the future. Please be aware that you must use Arm Compiler 6 for future development, and we will validate all code contributions to Mbed OS Arm Compiler 6.
</span>
<div style="background-color:#F3F3F3; text-align:left; vertical-align: middle; padding:15px 30px;"> **Note:** Although you can specify `ARMC5` in `supported_toolchains` in `targets.json`, it's not a valid option for `--toolchain` when compiling using [Mbed CLI](../tools/developing-mbed-cli.html). Arm Compiler 6 is the default ARM toolchain for Mbed OS development. Most Mbed OS platforms are already compatible with Arm Compiler 6. Some existing targets still supporting Arm Compiler 5 will be migrated to Arm Compiler 6 in the future. You must use Arm Compiler 6 for future development, and we will validate all code contributions to Mbed OS on Arm Compiler 6. However, if you need to update to Mbed OS 5.12 but still require compiling with Arm Compiler 5 until you are in possession of Arm Compiler 6, you can modify the `supported_toolchains` entry in targets.json to replace all `ARM`, `ARMC6` entries with `ARMC5`:

```
"MY_TARGET_NAME": {
"supported_form_factors": [...],
"core": "Cortex-M4",
"supported_toolchains": ["ARMC5", "GCC_ARM", "IAR"],
...
}
```
</div>

#### default_toolchain

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