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WIP: Icesugar support#49

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Commits on Jul 13, 2022

• boards: icesugar: icesugar is apparently a clone of icebreaker

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• boards: icesugar: passthrough PLL and fix clk at 12Mhz

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• boards: icesugar: switch to FEMTORV32_QUARK

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• boards: icesugar: icesugar flash size is 8MB (half icebreaker size), disable old and lex matrix pmods

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• boards: icesugar: use PMOD-SWITCH in PMOD1 and PMOD-LED in PMOD2

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• boards: icesugar: update icesugar.mk following icebreaker.mk

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• boards: icesugar: use d0-d3 and d7 for leds (PMOD2), and s1 for RESET (PMOD1)

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• boards: icesugar: Icesugar has half the flash size of Icebreaker (but use the

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• boards: icesugar: add spiflash_icesugar.ld to run examples from flash

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• boards: icesugar: correct reset address to 0x820000 since flash is memory mapped @ 0x800000

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• boards: icesugar: use icesprog to load hex files

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• boards: icesugar: miso/mosi spi are inverted in flash_prog mode

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