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can't use pin 27-34 as IO
place & route shows following message:
Warning (PR2028) : The constraint location is useless in current package. Warning (PR2017) : 'spi_clk_ibuf'(INS_IBUF) can't be placed according to Constraint, because the Constraint location is a Dedicated Pin.
Today encountered exatctly same problem. Founded solution here:
https://en.bbs.sipeed.com/t/topic/1801
Project -> Configuration -> Place&Route -> Dual-Purpose pin
Turn on "Use SSPI as regular IO" and "Use MSPI as regular IO"