README.md: Update README for serial output
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@ -68,7 +68,8 @@ build using `make`, follow these instructions:
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arm | imx6 | armv7-a | cortex-a9
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ia32 | pc99 | |
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* For a debug build, append `DEBUG=y`.
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* For a debug build, append `DEBUG=y` and to see serial output additionally
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append `CONFIG_KERNEL_EXTRA_CPPFLAGS="-DCONFIG_PRINTING=y -DCONFIG_USER_STACK_TRACE_LENGTH=16"`.
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See the seL4 website for more [comprehensive build instructions][5].
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