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3 Commits

Author SHA1 Message Date
Phil Howard 71f6eb5ac9 rp2: Mark gc_heap NOLOAD for faster boot. 
Create a new linker section .unitialized_bss for bss that does not need
zero-initialising.

Move gc_heap to this section, which saves ~30ms from rising edge of RESET
to setting a pin HIGH in MicroPython.

Zero fill happens in Pico SDK crt0.S before ROSC is configured.  It's very,
very slow.

Signed-off-by: Phil Howard <phil@gadgetoid.com>
 2022-08-11 14:16:29 +10:00
graham sanderson 52d3ae707d rp2/memmap_mp.ld: Update for latest SDK. 2021-02-02 10:59:10 +11:00
Damien George 469345e728 rp2: Add new port to Raspberry Pi RP2 microcontroller. 
This commit adds a new port "rp2" which targets the new Raspberry Pi RP2040
microcontroller.

The build system uses pure cmake (with a small Makefile wrapper for
convenience).  The USB driver is TinyUSB, and there is a machine module
with most of the standard classes implemented.  Some examples are provided
in the examples/rp2/ directory.

Work done in collaboration with Graham Sanderson.

Signed-off-by: Damien George <damien@micropython.org>
 2021-01-30 00:42:29 +11:00