Kontron COMe-cP2020 - Manual (Page 43)

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COMe-P2020 User Guide
43
3.4 Board Control and Status Registers
The following registers are special registers which the COMe-cP2020 uses to monitor and control the onboard hardware
special features.
N O T I C E
Take care when modifying the contents of these registers as the system may be relying on the state of
the bits under its control.
Table 3-4: 0x000: User Boot ROM Location Configuration Register
ACTION D7 D6 D5 D4 D3 D2 D1 D0
READ NU NU NU NU cfg_rom_loc[0:3]
WRITE NU NU NU NU cfg_rom_loc[0:3]
POWER UP 1 1 1 1 1 1 1 1
BITFIELD DESCRIPTION
[D3-D0] 0000 PCI Express 1
0001 PCI Express 1
0010 Serial RapidIO 1
0011 Serial RapidIO 2
0100 DDR Controller
0101 PCI Express 3
0110 On-chip boot ROM-SPI configuration
0111 On-chip boot ROM-eSDHC configuration
1000 Local bus FCM-8-bit NAND flash small page
1001 Reserved
1010 Local bus FCM-8-bit NAND flash large page
1011 Reserved
1100 Reserved
1101 Local bus GPCM-8-bit
1110 Local bus GPCM-16-bit ROM
1111 Local bus GPCM-16-bit ROM (default)