Linus Torvalds d2cd12557a Turn the rp2354a reference design into a design block ...

This removes the BM28 connector, since the expectation is that we can
now just place the design directly onto a board rather than connecting a
helper board.  It also removes some other random details that made sense
as a discrete board (like the power and GPIO LEDs but also the BOOTSEL
switch) but should would be done by the board that uses this design
block.

This also is much more aggressive about using smaller components, just
to make it possibly to route out all the GPIOs.  The original design
didn't route out everything because the end result was still limited by
the BM28 connector (and my expectation of not needing so many GPIOs),
and avoided 0201 components.

The 10uF bulk bypass capacitors have also been BOM-consolidated to
4.7uF: they came from the RP2350 minimal design, but they were actually
centered around the 3.3V LDO.  I'm keeping them around in the smaller
form, feeding the 100nF bypass capacitors.

Hopefully the end result works - both as a design block and as hardware
design.  We will find out.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2026-07-20 08:57:14 -07:00

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