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pru: Document how -mmcu option uses MCU specs

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The plan to maintain PRU hardware-specific specs in newlib tree has been
abandoned in favour of a new distinct GIT project.  Update the
documentation accordingly.

gcc/ChangeLog:

	* doc/invoke.texi (-mmcu): Add information about MCU specs.

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
This commit is contained in:
Dimitar Dimitrov 2024-02-01 19:19:54 +02:00
parent e3dfc15051
commit 608d40fde0
1 changed files with 8 additions and 2 deletions
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10
gcc/doc/invoke.texi
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@ -30106,8 +30106,14 @@ This is already the norm for most firmware projects.
@opindex mmcu
@item -mmcu=@var{mcu}
Specify the PRU MCU variant to use. Check Newlib for the exact list of
supported MCUs.
Specify the PRU hardware variant to use. A correspondingly named
spec file would be loaded, passing the memory region sizes to
the linker and defining hardware-specific C macros.
Newlib provides only the @code{sim} spec, intended for running
regression tests using a simulator. Specs for real hardware can be
obtained by installing the
@w{@uref{https://github.com/dinuxbg/gnuprumcu/,GnuPruMcu}} package.
@opindex mno-relax
@item -mno-relax