UMA board DSW202
  --- PS kernel --
  Sw8  bit0   0^ use H1500,         1_ no use H1500 (CD-BOOT only)
  Sw7  bit1   0^ display color bar  1_ no color bar
  Sw6  bit2   0^ IOP Kernel         1_ PS Kernel (when PS mode)
  Sw5  bit3   0^ check cd-rom       1_ ignore cdrom always
  Sw4  bit4   0^ Dram 16M           1_ Dram 2M
  Sw3  bit5   0^ disable            1_ enable EE ssbus access
  --- IOP kernel --
  Sw5  bit3   0^ Extr Wide DMA      1_ Extr Wide DMA disable
  Sw4  bit4   0^ Dram 16M           1_ Dram 2M
  Sw3  bit5   0^ disable            1_ enable EE ssbus access
  --- EE --
  Sw2  bit6   0^ --                 1_ --
  Sw1  bit7   0^ EE normal boot     1_ EE/GS self test
