tmedicci commented on code in PR #9022:
URL: https://github.com/apache/nuttx/pull/9022#discussion_r1175552966
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arch/xtensa/Kconfig:
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@@ -82,6 +82,7 @@ config ARCH_CHIP_ESP32S3
select ARCH_HAVE_RESET
select ARCH_HAVE_TESTSET
select ARCH_VECNOTIRQ
+ select FORCE_LIBC_ARCH_KERNEL if BUILD_PROTECTED
select LIBC_ARCH_MEMCPY if BUILD_FLAT
Review Comment:
The option `FORCE_LIBC_ARCH_KERNEL` forces the kernel to use the alternative
version (or ROM functions, in this case) on the kernel while allowing the
userspace to build the C version.
Specifically, S3 does not allow userspace to directly access the ROM
functions through the MMU. That's why the userspace would need to build the C
version. On the other hand, the Wi-Fi driver requires the usage of the ROM
functions on the kernel-side.
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