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WHAAAAAT !?? Not using MISO/MOSI but 2 other pins ! WTF couldn't you say that before I send the cards to produce in China ? Ok it's a matter of 1500 JPY but still. I spent hours (literally) searching why my cards didn't work.
... and wait, there's more !
2.3.15 PEN This is a programming enable pin for the SPI Serial Programming mode. By holding this pin low during a Power-on Reset, the device will enter the SPI Serial Programming mode. PEN is internally pulled high. The pullup is shown in Figure 10-1 on page 52 and its value is given in Section 28.2 “DC Characteristics” on page 327. PEN has no function during normal operation.
WHAAAAAT !?? I have ALSO to pull that pin /PEN low when I program ??!! And cherry on the cake, that pin is dedicated to that purpose, can't reuse it ... great.
Edit: In fact it seems you don't have to bring /PEN low, it works fine if not doing it with my pololu programmer. That's one annoyance less.
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