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Resolve unknown ICE40 part numbers ICE40U4K-UWG30 and ICE40U4K-SG48 #545

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@zapta

Description

These two part numbers in fpga.json are unknown. Resolve them, verify their attributes and verify the match to the odt boards that use the second one (48).

They were added originally in b427656

Boards
https://github.com/Oak-Development-Technologies/IcyBlue
https://github.com/Oak-Development-Technologies/RPGA-Feather

fpgas.json:

  "ice40-u4k-uwg30": {
    "part_num": "ICE40U4K-UWG30",    
    "arch": "ice40",
    "type": "u4k",
    "size": "4k",
    "pack": "uwg30"
  },
  "ice40-u4k-sg48": {
    "part_num": "ICE40U4K-SG48",     
    "arch": "ice40",
    "type": "u4k",
    "size": "4k",
    "pack": "sg48"
  }

boards.json:

  "odt-icyblue-feather": {
    "legacy_name": "ODT_IcyBlue_Feather",
    "description": "ODT_IcyBlue_Feather",
    "fpga": "ice40-u4k-sg48",
    "programmer": {
      "type": "icesprog"
    },
    "usb": {
      "vid": "0403",
      "pid": "6014"
    }
  },
  "odt-rpga-feather": {
    "legacy_name": "ODT_RPGA_Feather",
    "description": "ODT_RPGA_Feather",
    "fpga": "ice40-u4k-sg48",
    "programmer": {
      "type": "mcu"
    }
  },

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