hal/imxrt: Support RTT as a HAL console #600
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UART is enabled by default (current behavior), but can be turned off by defining UART_CONSOLE_KERNEL with an empty value. RTT is enabled by defining RTT_ENABLED with a truthy value and (optionally) selecting a channel to use by RTT_CONSOLE_KERNEL (0-based). UART and RTT may be used at the same time. RTT driver reuses the control block configured by plo, which must also create a map named via RTT_SYSPAGE_MAP_NAME (default: "rtt"). Channel configuration is not altered at all, so RTT will work even when user-mode driver takes control - exception dumps will still be printed. JIRA: RTOS-754
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UART is enabled by default (current behavior), but can be turned off by defining UART_CONSOLE_KERNEL with an empty value. RTT is enabled by defining RTT_ENABLED with a truthy value and (optionally) selecting a channel to use by RTT_CONSOLE_KERNEL (0-based). UART and RTT may be used at the same time.
RTT driver reuses the control block configured by plo, which must also create a map named via RTT_SYSPAGE_MAP_NAME (default: "rtt"). Channel configuration is not altered at all, so RTT will work even when user-mode driver takes control - exception dumps will still be printed.
JIRA: RTOS-754
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